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 LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  74 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  75 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  76 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  77 #define CEIL(x) (((x) != (int) (x)) ? (x) + 1 : (x))
  78 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  79
  80 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  81 #define IS_TRUECOL(x)    (1 << 24 & (x))
  82 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  83 #define TRUEGREEN(x)     (((x) & 0xff00))
  84 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  85
  86
  87 #define VT102ID "\033[?6c"
  88
  89 enum glyph_attribute {
  90         ATTR_NULL      = 0,
  91         ATTR_REVERSE   = 1,
  92         ATTR_UNDERLINE = 2,
  93         ATTR_BOLD      = 4,
  94         ATTR_GFX       = 8,
  95         ATTR_ITALIC    = 16,
  96         ATTR_BLINK     = 32,
  97         ATTR_WRAP      = 64,
  98         ATTR_WIDE      = 128,
  99         ATTR_WDUMMY    = 256,
 100 };
 101
 102 enum cursor_movement {
 103         CURSOR_SAVE,
 104         CURSOR_LOAD
 105 };
 106
 107 enum cursor_state {
 108         CURSOR_DEFAULT  = 0,
 109         CURSOR_WRAPNEXT = 1,
 110         CURSOR_ORIGIN   = 2
 111 };
 112
 113 enum term_mode {
 114         MODE_WRAP        = 1,
 115         MODE_INSERT      = 2,
 116         MODE_APPKEYPAD   = 4,
 117         MODE_ALTSCREEN   = 8,
 118         MODE_CRLF        = 16,
 119         MODE_MOUSEBTN    = 32,
 120         MODE_MOUSEMOTION = 64,
 121         MODE_REVERSE     = 128,
 122         MODE_KBDLOCK     = 256,
 123         MODE_HIDE        = 512,
 124         MODE_ECHO        = 1024,
 125         MODE_APPCURSOR   = 2048,
 126         MODE_MOUSESGR    = 4096,
 127         MODE_8BIT        = 8192,
 128         MODE_BLINK       = 16384,
 129         MODE_FBLINK      = 32768,
 130         MODE_FOCUS       = 65536,
 131         MODE_MOUSEX10    = 131072,
 132         MODE_MOUSEMANY   = 262144,
 133         MODE_BRCKTPASTE  = 524288,
 134         MODE_PRINT       = 1048576,
 135         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 136                           |MODE_MOUSEMANY,
 137 };
 138
 139 enum charset {
 140         CS_GRAPHIC0,
 141         CS_GRAPHIC1,
 142         CS_UK,
 143         CS_USA,
 144         CS_MULTI,
 145         CS_GER,
 146         CS_FIN
 147 };
 148
 149 enum escape_state {
 150         ESC_START      = 1,
 151         ESC_CSI        = 2,
 152         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 153         ESC_ALTCHARSET = 8,
 154         ESC_STR_END    = 16, /* a final string was encountered */
 155         ESC_TEST       = 32, /* Enter in test mode */
 156 };
 157
 158 enum window_state {
 159         WIN_VISIBLE = 1,
 160         WIN_REDRAW  = 2,
 161         WIN_FOCUSED = 4
 162 };
 163
 164 enum selection_type {
 165         SEL_REGULAR = 1,
 166         SEL_RECTANGULAR = 2
 167 };
 168
 169 enum selection_snap {
 170         SNAP_WORD = 1,
 171         SNAP_LINE = 2
 172 };
 173
 174 typedef unsigned char uchar;
 175 typedef unsigned int uint;
 176 typedef unsigned long ulong;
 177 typedef unsigned short ushort;
 178
 179 typedef XftDraw *Draw;
 180 typedef XftColor Colour;
 181 typedef Colormap Colourmap;
 182
 183 typedef struct {
 184         char c[UTF_SIZ]; /* character code */
 185         ushort mode;      /* attribute flags */
 186         uint32_t fg;      /* foreground  */
 187         uint32_t bg;      /* background  */
 188 } Glyph;
 189
 190 typedef Glyph *Line;
 191
 192 typedef struct {
 193         Glyph attr; /* current char attributes */
 194         int x;
 195         int y;
 196         char state;
 197 } TCursor;
 198
 199 /* CSI Escape sequence structs */
 200 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 201 typedef struct {
 202         char buf[ESC_BUF_SIZ]; /* raw string */
 203         int len;               /* raw string length */
 204         char priv;
 205         int arg[ESC_ARG_SIZ];
 206         int narg;              /* nb of args */
 207         char mode;
 208 } CSIEscape;
 209
 210 /* STR Escape sequence structs */
 211 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 212 typedef struct {
 213         char type;             /* ESC type ... */
 214         char buf[STR_BUF_SIZ]; /* raw string */
 215         int len;               /* raw string length */
 216         char *args[STR_ARG_SIZ];
 217         int narg;              /* nb of args */
 218 } STREscape;
 219
 220 /* Internal representation of the screen */
 221 typedef struct {
 222         int row;      /* nb row */
 223         int col;      /* nb col */
 224         Line *line;   /* screen */
 225         Line *alt;    /* alternate screen */
 226         bool *dirty;  /* dirtyness of lines */
 227         TCursor c;    /* cursor */
 228         int top;      /* top    scroll limit */
 229         int bot;      /* bottom scroll limit */
 230         int mode;     /* terminal mode flags */
 231         int esc;      /* escape state flags */
 232         char trantbl[4]; /* charset table translation */
 233         int charset;  /* current charset */
 234         int icharset; /* selected charset for sequence */
 235         bool numlock; /* lock numbers in keyboard */
 236         bool *tabs;
 237 } Term;
 238
 239 /* Purely graphic info */
 240 typedef struct {
 241         Display *dpy;
 242         Colourmap cmap;
 243         Window win;
 244         Drawable buf;
 245         Atom xembed, wmdeletewin, netwmname, netwmpid;
 246         XIM xim;
 247         XIC xic;
 248         Draw draw;
 249         Visual *vis;
 250         XSetWindowAttributes attrs;
 251         int scr;
 252         bool isfixed; /* is fixed geometry? */
 253         int l, t; /* left and top offset */
 254         int gm; /* geometry mask */
 255         int tw, th; /* tty width and height */
 256         int w, h; /* window width and height */
 257         int ch; /* char height */
 258         int cw; /* char width  */
 259         char state; /* focus, redraw, visible */
 260 } XWindow;
 261
 262 typedef struct {
 263         uint b;
 264         uint mask;
 265         char *s;
 266 } Mousekey;
 267
 268 typedef struct {
 269         KeySym k;
 270         uint mask;
 271         char *s;
 272         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 273         signed char appkey;    /* application keypad */
 274         signed char appcursor; /* application cursor */
 275         signed char crlf;      /* crlf mode          */
 276 } Key;
 277
 278 typedef struct {
 279         int mode;
 280         int type;
 281         int snap;
 282         /*
 283          * Selection variables:
 284          * nb – normalized coordinates of the beginning of the selection
 285          * ne – normalized coordinates of the end of the selection
 286          * ob – original coordinates of the beginning of the selection
 287          * oe – original coordinates of the end of the selection
 288          */
 289         struct {
 290                 int x, y;
 291         } nb, ne, ob, oe;
 292
 293         char *clip;
 294         Atom xtarget;
 295         bool alt;
 296         struct timeval tclick1;
 297         struct timeval tclick2;
 298 } Selection;
 299
 300 typedef union {
 301         int i;
 302         uint ui;
 303         float f;
 304         const void *v;
 305 } Arg;
 306
 307 typedef struct {
 308         uint mod;
 309         KeySym keysym;
 310         void (*func)(const Arg *);
 311         const Arg arg;
 312 } Shortcut;
 313
 314 /* function definitions used in config.h */
 315 static void clippaste(const Arg *);
 316 static void numlock(const Arg *);
 317 static void selpaste(const Arg *);
 318 static void xzoom(const Arg *);
 319 static void printsel(const Arg *);
 320 static void printscreen(const Arg *) ;
 321 static void toggleprinter(const Arg *);
 322
 323 /* Config.h for applying patches and the configuration. */
 324 #include "config.h"
 325
 326 /* Font structure */
 327 typedef struct {
 328         int height;
 329         int width;
 330         int ascent;
 331         int descent;
 332         short lbearing;
 333         short rbearing;
 334         XftFont *match;
 335         FcFontSet *set;
 336         FcPattern *pattern;
 337 } Font;
 338
 339 /* Drawing Context */
 340 typedef struct {
 341         Colour col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 342         Font font, bfont, ifont, ibfont;
 343         GC gc;
 344 } DC;
 345
 346 static void die(const char *, ...);
 347 static void draw(void);
 348 static void redraw(int);
 349 static void drawregion(int, int, int, int);
 350 static void execsh(void);
 351 static void sigchld(int);
 352 static void run(void);
 353
 354 static void csidump(void);
 355 static void csihandle(void);
 356 static void csiparse(void);
 357 static void csireset(void);
 358 static void strdump(void);
 359 static void strhandle(void);
 360 static void strparse(void);
 361 static void strreset(void);
 362
 363 static int tattrset(int);
 364 static void tprinter(char *, size_t);
 365 static void tdumpsel(void);
 366 static void tdumpline(int);
 367 static void tdump(void);
 368 static void tclearregion(int, int, int, int);
 369 static void tcursor(int);
 370 static void tdeletechar(int);
 371 static void tdeleteline(int);
 372 static void tinsertblank(int);
 373 static void tinsertblankline(int);
 374 static void tmoveto(int, int);
 375 static void tmoveato(int, int);
 376 static void tnew(int, int);
 377 static void tnewline(int);
 378 static void tputtab(int);
 379 static void tputc(char *, int);
 380 static void treset(void);
 381 static int tresize(int, int);
 382 static void tscrollup(int, int);
 383 static void tscrolldown(int, int);
 384 static void tsetattr(int *, int);
 385 static void tsetchar(char *, Glyph *, int, int);
 386 static void tsetscroll(int, int);
 387 static void tswapscreen(void);
 388 static void tsetdirt(int, int);
 389 static void tsetdirtattr(int);
 390 static void tsetmode(bool, bool, int *, int);
 391 static void tfulldirt(void);
 392 static void techo(char *, int);
 393 static int32_t tdefcolor(int *, int *, int);
 394 static void tselcs(void);
 395 static void tdeftran(char);
 396 static inline bool match(uint, uint);
 397 static void ttynew(void);
 398 static void ttyread(void);
 399 static void ttyresize(void);
 400 static void ttysend(char *, size_t);
 401 static void ttywrite(const char *, size_t);
 402
 403 static void xdraws(char *, Glyph, int, int, int, int);
 404 static void xhints(void);
 405 static void xclear(int, int, int, int);
 406 static void xdrawcursor(void);
 407 static void xinit(void);
 408 static void xloadcols(void);
 409 static int xsetcolorname(int, const char *);
 410 static int xgeommasktogravity(int);
 411 static int xloadfont(Font *, FcPattern *);
 412 static void xloadfonts(char *, double);
 413 static int xloadfontset(Font *);
 414 static void xsettitle(char *);
 415 static void xresettitle(void);
 416 static void xsetpointermotion(int);
 417 static void xseturgency(int);
 418 static void xsetsel(char *);
 419 static void xtermclear(int, int, int, int);
 420 static void xunloadfont(Font *);
 421 static void xunloadfonts(void);
 422 static void xresize(int, int);
 423
 424 static void expose(XEvent *);
 425 static void visibility(XEvent *);
 426 static void unmap(XEvent *);
 427 static char *kmap(KeySym, uint);
 428 static void kpress(XEvent *);
 429 static void cmessage(XEvent *);
 430 static void cresize(int, int);
 431 static void resize(XEvent *);
 432 static void focus(XEvent *);
 433 static void brelease(XEvent *);
 434 static void bpress(XEvent *);
 435 static void bmotion(XEvent *);
 436 static void selnotify(XEvent *);
 437 static void selclear(XEvent *);
 438 static void selrequest(XEvent *);
 439
 440 static void selinit(void);
 441 static void selsort(void);
 442 static inline bool selected(int, int);
 443 static char *getsel(void);
 444 static void selcopy(void);
 445 static void selscroll(int, int);
 446 static void selsnap(int, int *, int *, int);
 447
 448 static size_t utf8decode(char *, long *, size_t);
 449 static long utf8decodebyte(char, size_t *);
 450 static size_t utf8encode(long, char *, size_t);
 451 static char utf8encodebyte(long, size_t);
 452 static size_t utf8len(char *);
 453 static size_t utf8validate(long *, size_t);
 454
 455 static ssize_t xwrite(int, const char *, size_t);
 456 static void *xmalloc(size_t);
 457 static void *xrealloc(void *, size_t);
 458 static char *xstrdup(char *);
 459
 460 static void (*handler[LASTEvent])(XEvent *) = {
 461         [KeyPress] = kpress,
 462         [ClientMessage] = cmessage,
 463         [ConfigureNotify] = resize,
 464         [VisibilityNotify] = visibility,
 465         [UnmapNotify] = unmap,
 466         [Expose] = expose,
 467         [FocusIn] = focus,
 468         [FocusOut] = focus,
 469         [MotionNotify] = bmotion,
 470         [ButtonPress] = bpress,
 471         [ButtonRelease] = brelease,
 472         [SelectionClear] = selclear,
 473         [SelectionNotify] = selnotify,
 474         [SelectionRequest] = selrequest,
 475 };
 476
 477 /* Globals */
 478 static DC dc;
 479 static XWindow xw;
 480 static Term term;
 481 static CSIEscape csiescseq;
 482 static STREscape strescseq;
 483 static int cmdfd;
 484 static pid_t pid;
 485 static Selection sel;
 486 static int iofd = STDOUT_FILENO;
 487 static char **opt_cmd = NULL;
 488 static char *opt_io = NULL;
 489 static char *opt_title = NULL;
 490 static char *opt_embed = NULL;
 491 static char *opt_class = NULL;
 492 static char *opt_font = NULL;
 493 static int oldbutton = 3; /* button event on startup: 3 = release */
 494
 495 static char *usedfont = NULL;
 496 static double usedfontsize = 0;
 497
 498 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 499 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 500 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 501 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 502
 503 /* Font Ring Cache */
 504 enum {
 505         FRC_NORMAL,
 506         FRC_ITALIC,
 507         FRC_BOLD,
 508         FRC_ITALICBOLD
 509 };
 510
 511 typedef struct {
 512         XftFont *font;
 513         int flags;
 514 } Fontcache;
 515
 516 /* Fontcache is an array now. A new font will be appended to the array. */
 517 static Fontcache frc[16];
 518 static int frclen = 0;
 519
 520 ssize_t
 521 xwrite(int fd, const char *s, size_t len) {
 522         size_t aux = len;
 523
 524         while(len > 0) {
 525                 ssize_t r = write(fd, s, len);
 526                 if(r < 0)
 527                         return r;
 528                 len -= r;
 529                 s += r;
 530         }
 531         return aux;
 532 }
 533
 534 void *
 535 xmalloc(size_t len) {
 536         void *p = malloc(len);
 537
 538         if(!p)
 539                 die("Out of memory\n");
 540
 541         return p;
 542 }
 543
 544 void *
 545 xrealloc(void *p, size_t len) {
 546         if((p = realloc(p, len)) == NULL)
 547                 die("Out of memory\n");
 548
 549         return p;
 550 }
 551
 552 char *
 553 xstrdup(char *s) {
 554         if((s = strdup(s)) == NULL)
 555                 die("Out of memory\n");
 556
 557         return s;
 558 }
 559
 560 size_t
 561 utf8decode(char *c, long *u, size_t clen) {
 562         size_t i, j, len, type;
 563         long udecoded;
 564
 565         *u = UTF_INVALID;
 566         if(!clen)
 567                 return 0;
 568         udecoded = utf8decodebyte(c[0], &len);
 569         if(!BETWEEN(len, 1, UTF_SIZ))
 570                 return 1;
 571         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 572                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 573                 if(type != 0)
 574                         return j;
 575         }
 576         if(j < len)
 577                 return 0;
 578         *u = udecoded;
 579         utf8validate(u, len);
 580         return len;
 581 }
 582
 583 long
 584 utf8decodebyte(char c, size_t *i) {
 585         for(*i = 0; *i < LEN(utfmask); ++(*i))
 586                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 587                         return (uchar)c & ~utfmask[*i];
 588         return 0;
 589 }
 590
 591 size_t
 592 utf8encode(long u, char *c, size_t clen) {
 593         size_t len, i;
 594
 595         len = utf8validate(&u, 0);
 596         if(clen < len)
 597                 return 0;
 598         for(i = len - 1; i != 0; --i) {
 599                 c[i] = utf8encodebyte(u, 0);
 600                 u >>= 6;
 601         }
 602         c[0] = utf8encodebyte(u, len);
 603         return len;
 604 }
 605
 606 char
 607 utf8encodebyte(long u, size_t i) {
 608         return utfbyte[i] | (u & ~utfmask[i]);
 609 }
 610
 611 size_t
 612 utf8len(char *c) {
 613         return utf8decode(c, &(long){0}, UTF_SIZ);
 614 }
 615
 616 size_t
 617 utf8validate(long *u, size_t i) {
 618         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 619                 *u = UTF_INVALID;
 620         for(i = 1; *u > utfmax[i]; ++i)
 621                 ;
 622         return i;
 623 }
 624
 625 static void
 626 selinit(void) {
 627         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 628         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 629         sel.mode = 0;
 630         sel.ob.x = -1;
 631         sel.clip = NULL;
 632         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 633         if(sel.xtarget == None)
 634                 sel.xtarget = XA_STRING;
 635 }
 636
 637 static int
 638 x2col(int x) {
 639         x -= borderpx;
 640         x /= xw.cw;
 641
 642         return LIMIT(x, 0, term.col-1);
 643 }
 644
 645 static int
 646 y2row(int y) {
 647         y -= borderpx;
 648         y /= xw.ch;
 649
 650         return LIMIT(y, 0, term.row-1);
 651 }
 652
 653 static void
 654 selsort(void) {
 655         if(sel.ob.y == sel.oe.y) {
 656                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 657                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 658         } else {
 659                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 660                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 661         }
 662         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 663         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 664 }
 665
 666 static inline bool
 667 selected(int x, int y) {
 668         if(sel.ne.y == y && sel.nb.y == y)
 669                 return BETWEEN(x, sel.nb.x, sel.ne.x);
 670
 671         if(sel.type == SEL_RECTANGULAR) {
 672                 return ((sel.nb.y <= y && y <= sel.ne.y)
 673                         && (sel.nb.x <= x && x <= sel.ne.x));
 674         }
 675
 676         return ((sel.nb.y < y && y < sel.ne.y)
 677                 || (y == sel.ne.y && x <= sel.ne.x))
 678                 || (y == sel.nb.y && x >= sel.nb.x
 679                         && (x <= sel.ne.x || sel.nb.y != sel.ne.y));
 680 }
 681
 682 void
 683 selsnap(int mode, int *x, int *y, int direction) {
 684         int i;
 685
 686         switch(mode) {
 687         case SNAP_WORD:
 688                 /*
 689                  * Snap around if the word wraps around at the end or
 690                  * beginning of a line.
 691                  */
 692                 for(;;) {
 693                         if(direction < 0 && *x <= 0) {
 694                                 if(*y > 0 && term.line[*y - 1][term.col-1].mode
 695                                                 & ATTR_WRAP) {
 696                                         *y -= 1;
 697                                         *x = term.col-1;
 698                                 } else {
 699                                         break;
 700                                 }
 701                         }
 702                         if(direction > 0 && *x >= term.col-1) {
 703                                 if(*y < term.row-1 && term.line[*y][*x].mode
 704                                                 & ATTR_WRAP) {
 705                                         *y += 1;
 706                                         *x = 0;
 707                                 } else {
 708                                         break;
 709                                 }
 710                         }
 711
 712                         if(term.line[*y][*x+direction].mode & ATTR_WDUMMY) {
 713                                 *x += direction;
 714                                 continue;
 715                         }
 716
 717                         if(strchr(worddelimiters,
 718                                         term.line[*y][*x+direction].c[0])) {
 719                                 break;
 720                         }
 721
 722                         *x += direction;
 723                 }
 724                 break;
 725         case SNAP_LINE:
 726                 /*
 727                  * Snap around if the the previous line or the current one
 728                  * has set ATTR_WRAP at its end. Then the whole next or
 729                  * previous line will be selected.
 730                  */
 731                 *x = (direction < 0) ? 0 : term.col - 1;
 732                 if(direction < 0 && *y > 0) {
 733                         for(; *y > 0; *y += direction) {
 734                                 if(!(term.line[*y-1][term.col-1].mode
 735                                                 & ATTR_WRAP)) {
 736                                         break;
 737                                 }
 738                         }
 739                 } else if(direction > 0 && *y < term.row-1) {
 740                         for(; *y < term.row; *y += direction) {
 741                                 if(!(term.line[*y][term.col-1].mode
 742                                                 & ATTR_WRAP)) {
 743                                         break;
 744                                 }
 745                         }
 746                 }
 747                 break;
 748         default:
 749                 /*
 750                  * Select the whole line when the end of line is reached.
 751                  */
 752                 if(direction > 0) {
 753                         i = term.col;
 754                         while(--i > 0 && term.line[*y][i].c[0] == ' ')
 755                                 /* nothing */;
 756                         if(i > 0 && i < *x)
 757                                 *x = term.col - 1;
 758                 }
 759                 break;
 760         }
 761 }
 762
 763 void
 764 getbuttoninfo(XEvent *e) {
 765         int type;
 766         uint state = e->xbutton.state &~Button1Mask;
 767
 768         sel.alt = IS_SET(MODE_ALTSCREEN);
 769
 770         sel.oe.x = x2col(e->xbutton.x);
 771         sel.oe.y = y2row(e->xbutton.y);
 772
 773         if(sel.ob.y < sel.oe.y
 774                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 775                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 776                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 777         } else {
 778                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 779                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 780         }
 781         selsort();
 782
 783         sel.type = SEL_REGULAR;
 784         for(type = 1; type < LEN(selmasks); ++type) {
 785                 if(match(selmasks[type], state)) {
 786                         sel.type = type;
 787                         break;
 788                 }
 789         }
 790 }
 791
 792 void
 793 mousereport(XEvent *e) {
 794         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 795             button = e->xbutton.button, state = e->xbutton.state,
 796             len;
 797         char buf[40];
 798         static int ox, oy;
 799
 800         /* from urxvt */
 801         if(e->xbutton.type == MotionNotify) {
 802                 if(x == ox && y == oy)
 803                         return;
 804                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 805                         return;
 806                 /* MOUSE_MOTION: no reporting if no button is pressed */
 807                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 808                         return;
 809
 810                 button = oldbutton + 32;
 811                 ox = x;
 812                 oy = y;
 813         } else {
 814                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 815                         button = 3;
 816                 } else {
 817                         button -= Button1;
 818                         if(button >= 3)
 819                                 button += 64 - 3;
 820                 }
 821                 if(e->xbutton.type == ButtonPress) {
 822                         oldbutton = button;
 823                         ox = x;
 824                         oy = y;
 825                 } else if(e->xbutton.type == ButtonRelease) {
 826                         oldbutton = 3;
 827                         /* MODE_MOUSEX10: no button release reporting */
 828                         if(IS_SET(MODE_MOUSEX10))
 829                                 return;
 830                 }
 831         }
 832
 833         if(!IS_SET(MODE_MOUSEX10)) {
 834                 button += (state & ShiftMask   ? 4  : 0)
 835                         + (state & Mod4Mask    ? 8  : 0)
 836                         + (state & ControlMask ? 16 : 0);
 837         }
 838
 839         len = 0;
 840         if(IS_SET(MODE_MOUSESGR)) {
 841                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 842                                 button, x+1, y+1,
 843                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 844         } else if(x < 223 && y < 223) {
 845                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 846                                 32+button, 32+x+1, 32+y+1);
 847         } else {
 848                 return;
 849         }
 850
 851         ttywrite(buf, len);
 852 }
 853
 854 void
 855 bpress(XEvent *e) {
 856         struct timeval now;
 857         Mousekey *mk;
 858
 859         if(IS_SET(MODE_MOUSE)) {
 860                 mousereport(e);
 861                 return;
 862         }
 863
 864         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 865                 if(e->xbutton.button == mk->b
 866                                 && match(mk->mask, e->xbutton.state)) {
 867                         ttysend(mk->s, strlen(mk->s));
 868                         return;
 869                 }
 870         }
 871
 872         if(e->xbutton.button == Button1) {
 873                 gettimeofday(&now, NULL);
 874
 875                 /* Clear previous selection, logically and visually. */
 876                 selclear(NULL);
 877                 sel.mode = 1;
 878                 sel.type = SEL_REGULAR;
 879                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 880                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 881
 882                 /*
 883                  * If the user clicks below predefined timeouts specific
 884                  * snapping behaviour is exposed.
 885                  */
 886                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 887                         sel.snap = SNAP_LINE;
 888                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 889                         sel.snap = SNAP_WORD;
 890                 } else {
 891                         sel.snap = 0;
 892                 }
 893                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 894                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 895                 selsort();
 896
 897                 /*
 898                  * Draw selection, unless it's regular and we don't want to
 899                  * make clicks visible
 900                  */
 901                 if(sel.snap != 0) {
 902                         sel.mode++;
 903                         tsetdirt(sel.nb.y, sel.ne.y);
 904                 }
 905                 sel.tclick2 = sel.tclick1;
 906                 sel.tclick1 = now;
 907         }
 908 }
 909
 910 char *
 911 getsel(void) {
 912         char *str, *ptr;
 913         int x, y, bufsize, size, i, ex;
 914         Glyph *gp, *last;
 915
 916         if(sel.ob.x == -1) {
 917                 str = NULL;
 918         } else {
 919                 bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 920                 ptr = str = xmalloc(bufsize);
 921
 922                 /* append every set & selected glyph to the selection */
 923                 for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 924                         gp = &term.line[y][0];
 925                         last = &gp[term.col-1];
 926
 927                         while(last >= gp && !(selected(last - gp, y) &&
 928                                               strcmp(last->c, " ") != 0)) {
 929                                 --last;
 930                         }
 931
 932                         for(x = 0; gp <= last; x++, ++gp) {
 933                                 if(!selected(x, y) || (gp->mode & ATTR_WDUMMY))
 934                                         continue;
 935
 936                                 size = utf8len(gp->c);
 937                                 memcpy(ptr, gp->c, size);
 938                                 ptr += size;
 939                         }
 940
 941                         /*
 942                          * Copy and pasting of line endings is inconsistent
 943                          * in the inconsistent terminal and GUI world.
 944                          * The best solution seems like to produce '\n' when
 945                          * something is copied from st and convert '\n' to
 946                          * '\r', when something to be pasted is received by
 947                          * st.
 948                          * FIXME: Fix the computer world.
 949                          */
 950                         if(y < sel.ne.y && x > 0 && !((gp-1)->mode & ATTR_WRAP))
 951                                 *ptr++ = '\n';
 952
 953                         /*
 954                          * If the last selected line expands in the selection
 955                          * after the visible text '\n' is appended.
 956                          */
 957                         if(y == sel.ne.y) {
 958                                 i = term.col;
 959                                 while(--i > 0 && term.line[y][i].c[0] == ' ')
 960                                         /* nothing */;
 961                                 ex = sel.ne.x;
 962                                 if(sel.nb.y == sel.ne.y && sel.ne.x < sel.nb.x)
 963                                         ex = sel.nb.x;
 964                                 if(i < ex)
 965                                         *ptr++ = '\n';
 966                         }
 967                 }
 968                 *ptr = 0;
 969         }
 970         return str;
 971 }
 972
 973 void
 974 selcopy(void) {
 975         xsetsel(getsel());
 976 }
 977
 978 void
 979 selnotify(XEvent *e) {
 980         ulong nitems, ofs, rem;
 981         int format;
 982         uchar *data, *last, *repl;
 983         Atom type;
 984
 985         ofs = 0;
 986         do {
 987                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 988                                         False, AnyPropertyType, &type, &format,
 989                                         &nitems, &rem, &data)) {
 990                         fprintf(stderr, "Clipboard allocation failed\n");
 991                         return;
 992                 }
 993
 994                 /*
 995                  * As seen in getsel:
 996                  * Line endings are inconsistent in the terminal and GUI world
 997                  * copy and pasting. When receiving some selection data,
 998                  * replace all '\n' with '\r'.
 999                  * FIXME: Fix the computer world.
1000                  */
1001                 repl = data;
1002                 last = data + nitems * format / 8;
1003                 while((repl = memchr(repl, '\n', last - repl))) {
1004                         *repl++ = '\r';
1005                 }
1006
1007                 if(IS_SET(MODE_BRCKTPASTE))
1008                         ttywrite("\033[200~", 6);
1009                 ttysend((char *)data, nitems * format / 8);
1010                 if(IS_SET(MODE_BRCKTPASTE))
1011                         ttywrite("\033[201~", 6);
1012                 XFree(data);
1013                 /* number of 32-bit chunks returned */
1014                 ofs += nitems * format / 32;
1015         } while(rem > 0);
1016 }
1017
1018 void
1019 selpaste(const Arg *dummy) {
1020         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1021                         xw.win, CurrentTime);
1022 }
1023
1024 void
1025 clippaste(const Arg *dummy) {
1026         Atom clipboard;
1027
1028         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1029         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1030                         xw.win, CurrentTime);
1031 }
1032
1033 void
1034 selclear(XEvent *e) {
1035         if(sel.ob.x == -1)
1036                 return;
1037         sel.ob.x = -1;
1038         tsetdirt(sel.nb.y, sel.ne.y);
1039 }
1040
1041 void
1042 selrequest(XEvent *e) {
1043         XSelectionRequestEvent *xsre;
1044         XSelectionEvent xev;
1045         Atom xa_targets, string;
1046
1047         xsre = (XSelectionRequestEvent *) e;
1048         xev.type = SelectionNotify;
1049         xev.requestor = xsre->requestor;
1050         xev.selection = xsre->selection;
1051         xev.target = xsre->target;
1052         xev.time = xsre->time;
1053         /* reject */
1054         xev.property = None;
1055
1056         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1057         if(xsre->target == xa_targets) {
1058                 /* respond with the supported type */
1059                 string = sel.xtarget;
1060                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1061                                 XA_ATOM, 32, PropModeReplace,
1062                                 (uchar *) &string, 1);
1063                 xev.property = xsre->property;
1064         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1065                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1066                                 xsre->target, 8, PropModeReplace,
1067                                 (uchar *) sel.clip, strlen(sel.clip));
1068                 xev.property = xsre->property;
1069         }
1070
1071         /* all done, send a notification to the listener */
1072         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1073                 fprintf(stderr, "Error sending SelectionNotify event\n");
1074 }
1075
1076 void
1077 xsetsel(char *str) {
1078         /* register the selection for both the clipboard and the primary */
1079         Atom clipboard;
1080
1081         free(sel.clip);
1082         sel.clip = str;
1083
1084         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1085
1086         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1087         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1088 }
1089
1090 void
1091 brelease(XEvent *e) {
1092         if(IS_SET(MODE_MOUSE)) {
1093                 mousereport(e);
1094                 return;
1095         }
1096
1097         if(e->xbutton.button == Button2) {
1098                 selpaste(NULL);
1099         } else if(e->xbutton.button == Button1) {
1100                 if(sel.mode < 2) {
1101                         selclear(NULL);
1102                 } else {
1103                         getbuttoninfo(e);
1104                         selcopy();
1105                 }
1106                 sel.mode = 0;
1107                 tsetdirt(sel.nb.y, sel.ne.y);
1108         }
1109 }
1110
1111 void
1112 bmotion(XEvent *e) {
1113         int oldey, oldex, oldsby, oldsey;
1114
1115         if(IS_SET(MODE_MOUSE)) {
1116                 mousereport(e);
1117                 return;
1118         }
1119
1120         if(!sel.mode)
1121                 return;
1122
1123         sel.mode++;
1124         oldey = sel.oe.y;
1125         oldex = sel.oe.x;
1126         oldsby = sel.nb.y;
1127         oldsey = sel.ne.y;
1128         getbuttoninfo(e);
1129
1130         if(oldey != sel.oe.y || oldex != sel.oe.x)
1131                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1132 }
1133
1134 void
1135 die(const char *errstr, ...) {
1136         va_list ap;
1137
1138         va_start(ap, errstr);
1139         vfprintf(stderr, errstr, ap);
1140         va_end(ap);
1141         exit(EXIT_FAILURE);
1142 }
1143
1144 void
1145 execsh(void) {
1146         char **args;
1147         char *envshell = getenv("SHELL");
1148         const struct passwd *pass = getpwuid(getuid());
1149         char buf[sizeof(long) * 8 + 1];
1150
1151         unsetenv("COLUMNS");
1152         unsetenv("LINES");
1153         unsetenv("TERMCAP");
1154
1155         if(pass) {
1156                 setenv("LOGNAME", pass->pw_name, 1);
1157                 setenv("USER", pass->pw_name, 1);
1158                 setenv("SHELL", pass->pw_shell, 0);
1159                 setenv("HOME", pass->pw_dir, 0);
1160         }
1161
1162         snprintf(buf, sizeof(buf), "%lu", xw.win);
1163         setenv("WINDOWID", buf, 1);
1164
1165         signal(SIGCHLD, SIG_DFL);
1166         signal(SIGHUP, SIG_DFL);
1167         signal(SIGINT, SIG_DFL);
1168         signal(SIGQUIT, SIG_DFL);
1169         signal(SIGTERM, SIG_DFL);
1170         signal(SIGALRM, SIG_DFL);
1171
1172         DEFAULT(envshell, shell);
1173         setenv("TERM", termname, 1);
1174         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1175         execvp(args[0], args);
1176         exit(EXIT_FAILURE);
1177 }
1178
1179 void
1180 sigchld(int a) {
1181         int stat = 0;
1182
1183         if(waitpid(pid, &stat, 0) < 0)
1184                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1185
1186         if(WIFEXITED(stat)) {
1187                 exit(WEXITSTATUS(stat));
1188         } else {
1189                 exit(EXIT_FAILURE);
1190         }
1191 }
1192
1193 void
1194 ttynew(void) {
1195         int m, s;
1196         struct winsize w = {term.row, term.col, 0, 0};
1197
1198         /* seems to work fine on linux, openbsd and freebsd */
1199         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1200                 die("openpty failed: %s\n", strerror(errno));
1201
1202         switch(pid = fork()) {
1203         case -1:
1204                 die("fork failed\n");
1205                 break;
1206         case 0:
1207                 setsid(); /* create a new process group */
1208                 dup2(s, STDIN_FILENO);
1209                 dup2(s, STDOUT_FILENO);
1210                 dup2(s, STDERR_FILENO);
1211                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1212                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1213                 close(s);
1214                 close(m);
1215                 execsh();
1216                 break;
1217         default:
1218                 close(s);
1219                 cmdfd = m;
1220                 signal(SIGCHLD, sigchld);
1221                 if(opt_io) {
1222                         term.mode |= MODE_PRINT;
1223                         iofd = (!strcmp(opt_io, "-")) ?
1224                                   STDOUT_FILENO :
1225                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1226                         if(iofd < 0) {
1227                                 fprintf(stderr, "Error opening %s:%s\n",
1228                                         opt_io, strerror(errno));
1229                         }
1230                 }
1231         }
1232 }
1233
1234 void
1235 dump(char c) {
1236         static int col;
1237
1238         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
1239         if(++col % 10 == 0)
1240                 fprintf(stderr, "\n");
1241 }
1242
1243 void
1244 ttyread(void) {
1245         static char buf[BUFSIZ];
1246         static int buflen = 0;
1247         char *ptr;
1248         char s[UTF_SIZ];
1249         int charsize; /* size of utf8 char in bytes */
1250         long unicodep;
1251         int ret;
1252
1253         /* append read bytes to unprocessed bytes */
1254         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1255                 die("Couldn't read from shell: %s\n", strerror(errno));
1256
1257         /* process every complete utf8 char */
1258         buflen += ret;
1259         ptr = buf;
1260         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1261                 utf8encode(unicodep, s, UTF_SIZ);
1262                 tputc(s, charsize);
1263                 ptr += charsize;
1264                 buflen -= charsize;
1265         }
1266
1267         /* keep any uncomplete utf8 char for the next call */
1268         memmove(buf, ptr, buflen);
1269 }
1270
1271 void
1272 ttywrite(const char *s, size_t n) {
1273         if(xwrite(cmdfd, s, n) == -1)
1274                 die("write error on tty: %s\n", strerror(errno));
1275 }
1276
1277 void
1278 ttysend(char *s, size_t n) {
1279         ttywrite(s, n);
1280         if(IS_SET(MODE_ECHO))
1281                 techo(s, n);
1282 }
1283
1284 void
1285 ttyresize(void) {
1286         struct winsize w;
1287
1288         w.ws_row = term.row;
1289         w.ws_col = term.col;
1290         w.ws_xpixel = xw.tw;
1291         w.ws_ypixel = xw.th;
1292         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1293                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1294 }
1295
1296 int
1297 tattrset(int attr) {
1298         int i, j;
1299
1300         for(i = 0; i < term.row-1; i++) {
1301                 for(j = 0; j < term.col-1; j++) {
1302                         if(term.line[i][j].mode & attr)
1303                                 return 1;
1304                 }
1305         }
1306
1307         return 0;
1308 }
1309
1310 void
1311 tsetdirt(int top, int bot) {
1312         int i;
1313
1314         LIMIT(top, 0, term.row-1);
1315         LIMIT(bot, 0, term.row-1);
1316
1317         for(i = top; i <= bot; i++)
1318                 term.dirty[i] = 1;
1319 }
1320
1321 void
1322 tsetdirtattr(int attr) {
1323         int i, j;
1324
1325         for(i = 0; i < term.row-1; i++) {
1326                 for(j = 0; j < term.col-1; j++) {
1327                         if(term.line[i][j].mode & attr) {
1328                                 tsetdirt(i, i);
1329                                 break;
1330                         }
1331                 }
1332         }
1333 }
1334
1335 void
1336 tfulldirt(void) {
1337         tsetdirt(0, term.row-1);
1338 }
1339
1340 void
1341 tcursor(int mode) {
1342         static TCursor c[2];
1343         bool alt = IS_SET(MODE_ALTSCREEN);
1344
1345         if(mode == CURSOR_SAVE) {
1346                 c[alt] = term.c;
1347         } else if(mode == CURSOR_LOAD) {
1348                 term.c = c[alt];
1349                 tmoveto(c[alt].x, c[alt].y);
1350         }
1351 }
1352
1353 void
1354 treset(void) {
1355         uint i;
1356
1357         term.c = (TCursor){{
1358                 .mode = ATTR_NULL,
1359                 .fg = defaultfg,
1360                 .bg = defaultbg
1361         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1362
1363         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1364         for(i = tabspaces; i < term.col; i += tabspaces)
1365                 term.tabs[i] = 1;
1366         term.top = 0;
1367         term.bot = term.row - 1;
1368         term.mode = MODE_WRAP;
1369         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1370         term.charset = 0;
1371
1372         tclearregion(0, 0, term.col-1, term.row-1);
1373         tmoveto(0, 0);
1374         tcursor(CURSOR_SAVE);
1375 }
1376
1377 void
1378 tnew(int col, int row) {
1379         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1380         tresize(col, row);
1381         term.numlock = 1;
1382
1383         treset();
1384 }
1385
1386 void
1387 tswapscreen(void) {
1388         Line *tmp = term.line;
1389
1390         term.line = term.alt;
1391         term.alt = tmp;
1392         term.mode ^= MODE_ALTSCREEN;
1393         tfulldirt();
1394 }
1395
1396 void
1397 tscrolldown(int orig, int n) {
1398         int i;
1399         Line temp;
1400
1401         LIMIT(n, 0, term.bot-orig+1);
1402
1403         tsetdirt(orig, term.bot-n);
1404         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1405
1406         for(i = term.bot; i >= orig+n; i--) {
1407                 temp = term.line[i];
1408                 term.line[i] = term.line[i-n];
1409                 term.line[i-n] = temp;
1410         }
1411
1412         selscroll(orig, n);
1413 }
1414
1415 void
1416 tscrollup(int orig, int n) {
1417         int i;
1418         Line temp;
1419
1420         LIMIT(n, 0, term.bot-orig+1);
1421
1422         tclearregion(0, orig, term.col-1, orig+n-1);
1423         tsetdirt(orig+n, term.bot);
1424
1425         for(i = orig; i <= term.bot-n; i++) {
1426                 temp = term.line[i];
1427                 term.line[i] = term.line[i+n];
1428                 term.line[i+n] = temp;
1429         }
1430
1431         selscroll(orig, -n);
1432 }
1433
1434 void
1435 selscroll(int orig, int n) {
1436         if(sel.ob.x == -1)
1437                 return;
1438
1439         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1440                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1441                         selclear(NULL);
1442                         return;
1443                 }
1444                 if(sel.type == SEL_RECTANGULAR) {
1445                         if(sel.ob.y < term.top)
1446                                 sel.ob.y = term.top;
1447                         if(sel.oe.y > term.bot)
1448                                 sel.oe.y = term.bot;
1449                 } else {
1450                         if(sel.ob.y < term.top) {
1451                                 sel.ob.y = term.top;
1452                                 sel.ob.x = 0;
1453                         }
1454                         if(sel.oe.y > term.bot) {
1455                                 sel.oe.y = term.bot;
1456                                 sel.oe.x = term.col;
1457                         }
1458                 }
1459                 selsort();
1460         }
1461 }
1462
1463 void
1464 tnewline(int first_col) {
1465         int y = term.c.y;
1466
1467         if(y == term.bot) {
1468                 tscrollup(term.top, 1);
1469         } else {
1470                 y++;
1471         }
1472         tmoveto(first_col ? 0 : term.c.x, y);
1473 }
1474
1475 void
1476 csiparse(void) {
1477         char *p = csiescseq.buf, *np;
1478         long int v;
1479
1480         csiescseq.narg = 0;
1481         if(*p == '?') {
1482                 csiescseq.priv = 1;
1483                 p++;
1484         }
1485
1486         csiescseq.buf[csiescseq.len] = '\0';
1487         while(p < csiescseq.buf+csiescseq.len) {
1488                 np = NULL;
1489                 v = strtol(p, &np, 10);
1490                 if(np == p)
1491                         v = 0;
1492                 if(v == LONG_MAX || v == LONG_MIN)
1493                         v = -1;
1494                 csiescseq.arg[csiescseq.narg++] = v;
1495                 p = np;
1496                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1497                         break;
1498                 p++;
1499         }
1500         csiescseq.mode = *p;
1501 }
1502
1503 /* for absolute user moves, when decom is set */
1504 void
1505 tmoveato(int x, int y) {
1506         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1507 }
1508
1509 void
1510 tmoveto(int x, int y) {
1511         int miny, maxy;
1512
1513         if(term.c.state & CURSOR_ORIGIN) {
1514                 miny = term.top;
1515                 maxy = term.bot;
1516         } else {
1517                 miny = 0;
1518                 maxy = term.row - 1;
1519         }
1520         LIMIT(x, 0, term.col-1);
1521         LIMIT(y, miny, maxy);
1522         term.c.state &= ~CURSOR_WRAPNEXT;
1523         term.c.x = x;
1524         term.c.y = y;
1525 }
1526
1527 void
1528 tsetchar(char *c, Glyph *attr, int x, int y) {
1529         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1530                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1531                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1532                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1533                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1534                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1535                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1536                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1537                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1538         };
1539
1540         /*
1541          * The table is proudly stolen from rxvt.
1542          */
1543         if(attr->mode & ATTR_GFX) {
1544                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1545                         c = vt100_0[c[0] - 0x41];
1546                 }
1547         }
1548
1549         if(term.line[y][x].mode & ATTR_WIDE) {
1550                 if(x+1 < term.col) {
1551                         term.line[y][x+1].c[0] = ' ';
1552                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1553                 }
1554         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1555                 term.line[y][x-1].c[0] = ' ';
1556                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1557         }
1558
1559         term.dirty[y] = 1;
1560         term.line[y][x] = *attr;
1561         memcpy(term.line[y][x].c, c, UTF_SIZ);
1562 }
1563
1564 void
1565 tclearregion(int x1, int y1, int x2, int y2) {
1566         int x, y, temp;
1567
1568         if(x1 > x2)
1569                 temp = x1, x1 = x2, x2 = temp;
1570         if(y1 > y2)
1571                 temp = y1, y1 = y2, y2 = temp;
1572
1573         LIMIT(x1, 0, term.col-1);
1574         LIMIT(x2, 0, term.col-1);
1575         LIMIT(y1, 0, term.row-1);
1576         LIMIT(y2, 0, term.row-1);
1577
1578         for(y = y1; y <= y2; y++) {
1579                 term.dirty[y] = 1;
1580                 for(x = x1; x <= x2; x++) {
1581                         if(selected(x, y))
1582                                 selclear(NULL);
1583                         term.line[y][x] = term.c.attr;
1584                         memcpy(term.line[y][x].c, " ", 2);
1585                 }
1586         }
1587 }
1588
1589 void
1590 tdeletechar(int n) {
1591         int dst, src, size;
1592         Glyph *line;
1593
1594         LIMIT(n, 0, term.col - term.c.x);
1595
1596         dst = term.c.x;
1597         src = term.c.x + n;
1598         size = term.col - src;
1599         line = term.line[term.c.y];
1600
1601         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1602         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1603 }
1604
1605 void
1606 tinsertblank(int n) {
1607         int dst, src, size;
1608         Glyph *line;
1609
1610         LIMIT(n, 0, term.col - term.c.x);
1611
1612         dst = term.c.x + n;
1613         src = term.c.x;
1614         size = term.col - dst;
1615         line = term.line[term.c.y];
1616
1617         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1618         tclearregion(src, term.c.y, dst - 1, term.c.y);
1619 }
1620
1621 void
1622 tinsertblankline(int n) {
1623         if(BETWEEN(term.c.y, term.top, term.bot))
1624                 tscrolldown(term.c.y, n);
1625 }
1626
1627 void
1628 tdeleteline(int n) {
1629         if(BETWEEN(term.c.y, term.top, term.bot))
1630                 tscrollup(term.c.y, n);
1631 }
1632
1633 int32_t
1634 tdefcolor(int *attr, int *npar, int l) {
1635         int32_t idx = -1;
1636         uint r, g, b;
1637
1638         switch (attr[*npar + 1]) {
1639         case 2: /* direct colour in RGB space */
1640                 if (*npar + 4 >= l) {
1641                         fprintf(stderr,
1642                                 "erresc(38): Incorrect number of parameters (%d)\n",
1643                                 *npar);
1644                         break;
1645                 }
1646                 r = attr[*npar + 2];
1647                 g = attr[*npar + 3];
1648                 b = attr[*npar + 4];
1649                 *npar += 4;
1650                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1651                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1652                                 r, g, b);
1653                 else
1654                         idx = TRUECOLOR(r, g, b);
1655                 break;
1656         case 5: /* indexed colour */
1657                 if (*npar + 2 >= l) {
1658                         fprintf(stderr,
1659                                 "erresc(38): Incorrect number of parameters (%d)\n",
1660                                 *npar);
1661                         break;
1662                 }
1663                 *npar += 2;
1664                 if(!BETWEEN(attr[*npar], 0, 255))
1665                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1666                 else
1667                         idx = attr[*npar];
1668                 break;
1669         case 0: /* implemented defined (only foreground) */
1670         case 1: /* transparent */
1671         case 3: /* direct colour in CMY space */
1672         case 4: /* direct colour in CMYK space */
1673         default:
1674                 fprintf(stderr,
1675                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1676         }
1677
1678         return idx;
1679 }
1680
1681 void
1682 tsetattr(int *attr, int l) {
1683         int i;
1684         int32_t idx;
1685
1686         for(i = 0; i < l; i++) {
1687                 switch(attr[i]) {
1688                 case 0:
1689                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE \
1690                                         | ATTR_BOLD | ATTR_ITALIC \
1691                                         | ATTR_BLINK);
1692                         term.c.attr.fg = defaultfg;
1693                         term.c.attr.bg = defaultbg;
1694                         break;
1695                 case 1:
1696                         term.c.attr.mode |= ATTR_BOLD;
1697                         break;
1698                 case 3:
1699                         term.c.attr.mode |= ATTR_ITALIC;
1700                         break;
1701                 case 4:
1702                         term.c.attr.mode |= ATTR_UNDERLINE;
1703                         break;
1704                 case 5: /* slow blink */
1705                 case 6: /* rapid blink */
1706                         term.c.attr.mode |= ATTR_BLINK;
1707                         break;
1708                 case 7:
1709                         term.c.attr.mode |= ATTR_REVERSE;
1710                         break;
1711                 case 21:
1712                 case 22:
1713                         term.c.attr.mode &= ~ATTR_BOLD;
1714                         break;
1715                 case 23:
1716                         term.c.attr.mode &= ~ATTR_ITALIC;
1717                         break;
1718                 case 24:
1719                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1720                         break;
1721                 case 25:
1722                 case 26:
1723                         term.c.attr.mode &= ~ATTR_BLINK;
1724                         break;
1725                 case 27:
1726                         term.c.attr.mode &= ~ATTR_REVERSE;
1727                         break;
1728                 case 38:
1729                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1730                                 term.c.attr.fg = idx;
1731                         break;
1732                 case 39:
1733                         term.c.attr.fg = defaultfg;
1734                         break;
1735                 case 48:
1736                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1737                                 term.c.attr.bg = idx;
1738                         break;
1739                 case 49:
1740                         term.c.attr.bg = defaultbg;
1741                         break;
1742                 default:
1743                         if(BETWEEN(attr[i], 30, 37)) {
1744                                 term.c.attr.fg = attr[i] - 30;
1745                         } else if(BETWEEN(attr[i], 40, 47)) {
1746                                 term.c.attr.bg = attr[i] - 40;
1747                         } else if(BETWEEN(attr[i], 90, 97)) {
1748                                 term.c.attr.fg = attr[i] - 90 + 8;
1749                         } else if(BETWEEN(attr[i], 100, 107)) {
1750                                 term.c.attr.bg = attr[i] - 100 + 8;
1751                         } else {
1752                                 fprintf(stderr,
1753                                         "erresc(default): gfx attr %d unknown\n",
1754                                         attr[i]), csidump();
1755                         }
1756                         break;
1757                 }
1758         }
1759 }
1760
1761 void
1762 tsetscroll(int t, int b) {
1763         int temp;
1764
1765         LIMIT(t, 0, term.row-1);
1766         LIMIT(b, 0, term.row-1);
1767         if(t > b) {
1768                 temp = t;
1769                 t = b;
1770                 b = temp;
1771         }
1772         term.top = t;
1773         term.bot = b;
1774 }
1775
1776 void
1777 tsetmode(bool priv, bool set, int *args, int narg) {
1778         int *lim, mode;
1779         bool alt;
1780
1781         for(lim = args + narg; args < lim; ++args) {
1782                 if(priv) {
1783                         switch(*args) {
1784                         case 1: /* DECCKM -- Cursor key */
1785                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1786                                 break;
1787                         case 5: /* DECSCNM -- Reverse video */
1788                                 mode = term.mode;
1789                                 MODBIT(term.mode, set, MODE_REVERSE);
1790                                 if(mode != term.mode)
1791                                         redraw(REDRAW_TIMEOUT);
1792                                 break;
1793                         case 6: /* DECOM -- Origin */
1794                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1795                                 tmoveato(0, 0);
1796                                 break;
1797                         case 7: /* DECAWM -- Auto wrap */
1798                                 MODBIT(term.mode, set, MODE_WRAP);
1799                                 break;
1800                         case 0:  /* Error (IGNORED) */
1801                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1802                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1803                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1804                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1805                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1806                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1807                         case 42: /* DECNRCM -- National characters (IGNORED) */
1808                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1809                                 break;
1810                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1811                                 MODBIT(term.mode, !set, MODE_HIDE);
1812                                 break;
1813                         case 9:    /* X10 mouse compatibility mode */
1814                                 xsetpointermotion(0);
1815                                 MODBIT(term.mode, 0, MODE_MOUSE);
1816                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1817                                 break;
1818                         case 1000: /* 1000: report button press */
1819                                 xsetpointermotion(0);
1820                                 MODBIT(term.mode, 0, MODE_MOUSE);
1821                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1822                                 break;
1823                         case 1002: /* 1002: report motion on button press */
1824                                 xsetpointermotion(0);
1825                                 MODBIT(term.mode, 0, MODE_MOUSE);
1826                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1827                                 break;
1828                         case 1003: /* 1003: enable all mouse motions */
1829                                 xsetpointermotion(set);
1830                                 MODBIT(term.mode, 0, MODE_MOUSE);
1831                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1832                                 break;
1833                         case 1004: /* 1004: send focus events to tty */
1834                                 MODBIT(term.mode, set, MODE_FOCUS);
1835                                 break;
1836                         case 1006: /* 1006: extended reporting mode */
1837                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1838                                 break;
1839                         case 1034:
1840                                 MODBIT(term.mode, set, MODE_8BIT);
1841                                 break;
1842                         case 1049: /* swap screen & set/restore cursor as xterm */
1843                                 if (!allowaltscreen)
1844                                         break;
1845                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1846                                 /* FALLTHRU */
1847                         case 47: /* swap screen */
1848                         case 1047:
1849                                 if (!allowaltscreen)
1850                                         break;
1851                                 alt = IS_SET(MODE_ALTSCREEN);
1852                                 if(alt) {
1853                                         tclearregion(0, 0, term.col-1,
1854                                                         term.row-1);
1855                                 }
1856                                 if(set ^ alt) /* set is always 1 or 0 */
1857                                         tswapscreen();
1858                                 if(*args != 1049)
1859                                         break;
1860                                 /* FALLTRU */
1861                         case 1048:
1862                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1863                                 break;
1864                         case 2004: /* 2004: bracketed paste mode */
1865                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1866                                 break;
1867                         /* Not implemented mouse modes. See comments there. */
1868                         case 1001: /* mouse highlight mode; can hang the
1869                                       terminal by design when implemented. */
1870                         case 1005: /* UTF-8 mouse mode; will confuse
1871                                       applications not supporting UTF-8
1872                                       and luit. */
1873                         case 1015: /* urxvt mangled mouse mode; incompatible
1874                                       and can be mistaken for other control
1875                                       codes. */
1876                         default:
1877                                 fprintf(stderr,
1878                                         "erresc: unknown private set/reset mode %d\n",
1879                                         *args);
1880                                 break;
1881                         }
1882                 } else {
1883                         switch(*args) {
1884                         case 0:  /* Error (IGNORED) */
1885                                 break;
1886                         case 2:  /* KAM -- keyboard action */
1887                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1888                                 break;
1889                         case 4:  /* IRM -- Insertion-replacement */
1890                                 MODBIT(term.mode, set, MODE_INSERT);
1891                                 break;
1892                         case 12: /* SRM -- Send/Receive */
1893                                 MODBIT(term.mode, !set, MODE_ECHO);
1894                                 break;
1895                         case 20: /* LNM -- Linefeed/new line */
1896                                 MODBIT(term.mode, set, MODE_CRLF);
1897                                 break;
1898                         default:
1899                                 fprintf(stderr,
1900                                         "erresc: unknown set/reset mode %d\n",
1901                                         *args);
1902                                 break;
1903                         }
1904                 }
1905         }
1906 }
1907
1908 void
1909 csihandle(void) {
1910         char buf[40];
1911         int len;
1912
1913         switch(csiescseq.mode) {
1914         default:
1915         unknown:
1916                 fprintf(stderr, "erresc: unknown csi ");
1917                 csidump();
1918                 /* die(""); */
1919                 break;
1920         case '@': /* ICH -- Insert <n> blank char */
1921                 DEFAULT(csiescseq.arg[0], 1);
1922                 tinsertblank(csiescseq.arg[0]);
1923                 break;
1924         case 'A': /* CUU -- Cursor <n> Up */
1925                 DEFAULT(csiescseq.arg[0], 1);
1926                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1927                 break;
1928         case 'B': /* CUD -- Cursor <n> Down */
1929         case 'e': /* VPR --Cursor <n> Down */
1930                 DEFAULT(csiescseq.arg[0], 1);
1931                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1932                 break;
1933         case 'i': /* MC -- Media Copy */
1934                 switch(csiescseq.arg[0]) {
1935                 case 0:
1936                         tdump();
1937                         break;
1938                 case 1:
1939                         tdumpline(term.c.y);
1940                         break;
1941                 case 2:
1942                         tdumpsel();
1943                         break;
1944                 case 4:
1945                         term.mode &= ~MODE_PRINT;
1946                         break;
1947                 case 5:
1948                         term.mode |= MODE_PRINT;
1949                         break;
1950                 }
1951                 break;
1952         case 'c': /* DA -- Device Attributes */
1953                 if(csiescseq.arg[0] == 0)
1954                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1955                 break;
1956         case 'C': /* CUF -- Cursor <n> Forward */
1957         case 'a': /* HPR -- Cursor <n> Forward */
1958                 DEFAULT(csiescseq.arg[0], 1);
1959                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1960                 break;
1961         case 'D': /* CUB -- Cursor <n> Backward */
1962                 DEFAULT(csiescseq.arg[0], 1);
1963                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1964                 break;
1965         case 'E': /* CNL -- Cursor <n> Down and first col */
1966                 DEFAULT(csiescseq.arg[0], 1);
1967                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1968                 break;
1969         case 'F': /* CPL -- Cursor <n> Up and first col */
1970                 DEFAULT(csiescseq.arg[0], 1);
1971                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1972                 break;
1973         case 'g': /* TBC -- Tabulation clear */
1974                 switch(csiescseq.arg[0]) {
1975                 case 0: /* clear current tab stop */
1976                         term.tabs[term.c.x] = 0;
1977                         break;
1978                 case 3: /* clear all the tabs */
1979                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1980                         break;
1981                 default:
1982                         goto unknown;
1983                 }
1984                 break;
1985         case 'G': /* CHA -- Move to <col> */
1986         case '`': /* HPA */
1987                 DEFAULT(csiescseq.arg[0], 1);
1988                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1989                 break;
1990         case 'H': /* CUP -- Move to <row> <col> */
1991         case 'f': /* HVP */
1992                 DEFAULT(csiescseq.arg[0], 1);
1993                 DEFAULT(csiescseq.arg[1], 1);
1994                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1995                 break;
1996         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1997                 DEFAULT(csiescseq.arg[0], 1);
1998                 tputtab(csiescseq.arg[0]);
1999                 break;
2000         case 'J': /* ED -- Clear screen */
2001                 selclear(NULL);
2002                 switch(csiescseq.arg[0]) {
2003                 case 0: /* below */
2004                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2005                         if(term.c.y < term.row-1) {
2006                                 tclearregion(0, term.c.y+1, term.col-1,
2007                                                 term.row-1);
2008                         }
2009                         break;
2010                 case 1: /* above */
2011                         if(term.c.y > 1)
2012                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2013                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2014                         break;
2015                 case 2: /* all */
2016                         tclearregion(0, 0, term.col-1, term.row-1);
2017                         break;
2018                 default:
2019                         goto unknown;
2020                 }
2021                 break;
2022         case 'K': /* EL -- Clear line */
2023                 switch(csiescseq.arg[0]) {
2024                 case 0: /* right */
2025                         tclearregion(term.c.x, term.c.y, term.col-1,
2026                                         term.c.y);
2027                         break;
2028                 case 1: /* left */
2029                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2030                         break;
2031                 case 2: /* all */
2032                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2033                         break;
2034                 }
2035                 break;
2036         case 'S': /* SU -- Scroll <n> line up */
2037                 DEFAULT(csiescseq.arg[0], 1);
2038                 tscrollup(term.top, csiescseq.arg[0]);
2039                 break;
2040         case 'T': /* SD -- Scroll <n> line down */
2041                 DEFAULT(csiescseq.arg[0], 1);
2042                 tscrolldown(term.top, csiescseq.arg[0]);
2043                 break;
2044         case 'L': /* IL -- Insert <n> blank lines */
2045                 DEFAULT(csiescseq.arg[0], 1);
2046                 tinsertblankline(csiescseq.arg[0]);
2047                 break;
2048         case 'l': /* RM -- Reset Mode */
2049                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2050                 break;
2051         case 'M': /* DL -- Delete <n> lines */
2052                 DEFAULT(csiescseq.arg[0], 1);
2053                 tdeleteline(csiescseq.arg[0]);
2054                 break;
2055         case 'X': /* ECH -- Erase <n> char */
2056                 DEFAULT(csiescseq.arg[0], 1);
2057                 tclearregion(term.c.x, term.c.y,
2058                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2059                 break;
2060         case 'P': /* DCH -- Delete <n> char */
2061                 DEFAULT(csiescseq.arg[0], 1);
2062                 tdeletechar(csiescseq.arg[0]);
2063                 break;
2064         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2065                 DEFAULT(csiescseq.arg[0], 1);
2066                 tputtab(-csiescseq.arg[0]);
2067                 break;
2068         case 'd': /* VPA -- Move to <row> */
2069                 DEFAULT(csiescseq.arg[0], 1);
2070                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2071                 break;
2072         case 'h': /* SM -- Set terminal mode */
2073                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2074                 break;
2075         case 'm': /* SGR -- Terminal attribute (color) */
2076                 tsetattr(csiescseq.arg, csiescseq.narg);
2077                 break;
2078         case 'n': /* DSR – Device Status Report (cursor position) */
2079                 if (csiescseq.arg[0] == 6) {
2080                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2081                                         term.c.y+1, term.c.x+1);
2082                         ttywrite(buf, len);
2083                         break;
2084                 }
2085         case 'r': /* DECSTBM -- Set Scrolling Region */
2086                 if(csiescseq.priv) {
2087                         goto unknown;
2088                 } else {
2089                         DEFAULT(csiescseq.arg[0], 1);
2090                         DEFAULT(csiescseq.arg[1], term.row);
2091                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2092                         tmoveato(0, 0);
2093                 }
2094                 break;
2095         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2096                 tcursor(CURSOR_SAVE);
2097                 break;
2098         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2099                 tcursor(CURSOR_LOAD);
2100                 break;
2101         }
2102 }
2103
2104 void
2105 csidump(void) {
2106         int i;
2107         uint c;
2108
2109         printf("ESC[");
2110         for(i = 0; i < csiescseq.len; i++) {
2111                 c = csiescseq.buf[i] & 0xff;
2112                 if(isprint(c)) {
2113                         putchar(c);
2114                 } else if(c == '\n') {
2115                         printf("(\\n)");
2116                 } else if(c == '\r') {
2117                         printf("(\\r)");
2118                 } else if(c == 0x1b) {
2119                         printf("(\\e)");
2120                 } else {
2121                         printf("(%02x)", c);
2122                 }
2123         }
2124         putchar('\n');
2125 }
2126
2127 void
2128 csireset(void) {
2129         memset(&csiescseq, 0, sizeof(csiescseq));
2130 }
2131
2132 void
2133 strhandle(void) {
2134         char *p = NULL;
2135         int j, narg, par;
2136
2137         strparse();
2138         narg = strescseq.narg;
2139         par = atoi(strescseq.args[0]);
2140
2141         switch(strescseq.type) {
2142         case ']': /* OSC -- Operating System Command */
2143                 switch(par) {
2144                 case 0:
2145                 case 1:
2146                 case 2:
2147                         if(narg > 1)
2148                                 xsettitle(strescseq.args[1]);
2149                         return;
2150                 case 4: /* color set */
2151                         if(narg < 3)
2152                                 break;
2153                         p = strescseq.args[2];
2154                         /* fall through */
2155                 case 104: /* color reset, here p = NULL */
2156                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2157                         if (!xsetcolorname(j, p)) {
2158                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2159                         } else {
2160                                 /*
2161                                  * TODO if defaultbg color is changed, borders
2162                                  * are dirty
2163                                  */
2164                                 redraw(0);
2165                         }
2166                         return;
2167                 }
2168                 break;
2169         case 'k': /* old title set compatibility */
2170                 xsettitle(strescseq.args[0]);
2171                 return;
2172         case 'P': /* DCS -- Device Control String */
2173         case '_': /* APC -- Application Program Command */
2174         case '^': /* PM -- Privacy Message */
2175                 return;
2176         }
2177
2178         fprintf(stderr, "erresc: unknown str ");
2179         strdump();
2180 }
2181
2182 void
2183 strparse(void) {
2184         char *p = strescseq.buf;
2185
2186         strescseq.narg = 0;
2187         strescseq.buf[strescseq.len] = '\0';
2188         while(p && strescseq.narg < STR_ARG_SIZ)
2189                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2190 }
2191
2192 void
2193 strdump(void) {
2194         int i;
2195         uint c;
2196
2197         printf("ESC%c", strescseq.type);
2198         for(i = 0; i < strescseq.len; i++) {
2199                 c = strescseq.buf[i] & 0xff;
2200                 if(c == '\0') {
2201                         return;
2202                 } else if(isprint(c)) {
2203                         putchar(c);
2204                 } else if(c == '\n') {
2205                         printf("(\\n)");
2206                 } else if(c == '\r') {
2207                         printf("(\\r)");
2208                 } else if(c == 0x1b) {
2209                         printf("(\\e)");
2210                 } else {
2211                         printf("(%02x)", c);
2212                 }
2213         }
2214         printf("ESC\\\n");
2215 }
2216
2217 void
2218 strreset(void) {
2219         memset(&strescseq, 0, sizeof(strescseq));
2220 }
2221
2222 void
2223 tprinter(char *s, size_t len) {
2224         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2225                 fprintf(stderr, "Error writing in %s:%s\n",
2226                         opt_io, strerror(errno));
2227                 close(iofd);
2228                 iofd = -1;
2229         }
2230 }
2231
2232 void
2233 toggleprinter(const Arg *arg) {
2234         term.mode ^= MODE_PRINT;
2235 }
2236
2237 void
2238 printscreen(const Arg *arg) {
2239         tdump();
2240 }
2241
2242 void
2243 printsel(const Arg *arg) {
2244         tdumpsel();
2245 }
2246
2247 void
2248 tdumpsel(void) {
2249         char *ptr;
2250
2251         if((ptr = getsel())) {
2252                 tprinter(ptr, strlen(ptr));
2253                 free(ptr);
2254         }
2255 }
2256
2257 void
2258 tdumpline(int n) {
2259         Glyph *bp, *end;
2260
2261         bp = &term.line[n][0];
2262         end = &bp[term.col-1];
2263         while(end > bp && !strcmp(" ", end->c))
2264                 --end;
2265         if(bp != end || strcmp(bp->c, " ")) {
2266                 for( ;bp <= end; ++bp)
2267                         tprinter(bp->c, strlen(bp->c));
2268         }
2269         tprinter("\n", 1);
2270 }
2271
2272 void
2273 tdump(void) {
2274         int i;
2275
2276         for(i = 0; i < term.row; ++i)
2277                 tdumpline(i);
2278 }
2279
2280 void
2281 tputtab(int n) {
2282         uint x = term.c.x;
2283
2284         if(n > 0) {
2285                 while(x < term.col && n--)
2286                         for(++x; x < term.col && !term.tabs[x]; ++x)
2287                                 /* nothing */ ;
2288         } else if(n < 0) {
2289                 while(x > 0 && n++)
2290                         for(--x; x > 0 && !term.tabs[x]; --x)
2291                                 /* nothing */ ;
2292         }
2293         tmoveto(x, term.c.y);
2294 }
2295
2296 void
2297 techo(char *buf, int len) {
2298         for(; len > 0; buf++, len--) {
2299                 char c = *buf;
2300
2301                 if(BETWEEN(c, 0x00, 0x1f) || c == 0x7f) { /* control code */
2302                         if(c != '\n' && c != '\r' && c != '\t') {
2303                                 c ^= '\x40';
2304                                 tputc("^", 1);
2305                         }
2306                         tputc(&c, 1);
2307                 } else {
2308                         break;
2309                 }
2310         }
2311         if(len)
2312                 tputc(buf, len);
2313 }
2314
2315 void
2316 tdeftran(char ascii) {
2317         char c, (*bp)[2];
2318         static char tbl[][2] = {
2319                 {'0', CS_GRAPHIC0}, {'1', CS_GRAPHIC1}, {'A', CS_UK},
2320                 {'B', CS_USA},      {'<', CS_MULTI},    {'K', CS_GER},
2321                 {'5', CS_FIN},      {'C', CS_FIN},
2322                 {0, 0}
2323         };
2324
2325         for (bp = &tbl[0]; (c = (*bp)[0]) && c != ascii; ++bp)
2326                 /* nothing */;
2327
2328         if (c == 0)
2329                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2330         else
2331                 term.trantbl[term.icharset] = (*bp)[1];
2332 }
2333
2334 void
2335 tselcs(void) {
2336         MODBIT(term.c.attr.mode,
2337                term.trantbl[term.charset] == CS_GRAPHIC0,
2338                ATTR_GFX);
2339 }
2340
2341 void
2342 tputc(char *c, int len) {
2343         uchar ascii = *c;
2344         bool control = ascii < '\x20' || ascii == 0177;
2345         long unicodep;
2346         int width;
2347
2348         if(len == 1) {
2349                 width = 1;
2350         } else {
2351                 utf8decode(c, &unicodep, UTF_SIZ);
2352                 width = wcwidth(unicodep);
2353         }
2354
2355         if(IS_SET(MODE_PRINT))
2356                 tprinter(c, len);
2357
2358         /*
2359          * STR sequences must be checked before anything else
2360          * because it can use some control codes as part of the sequence.
2361          */
2362         if(term.esc & ESC_STR) {
2363                 switch(ascii) {
2364                 case '\033':
2365                         term.esc = ESC_START | ESC_STR_END;
2366                         break;
2367                 case '\a': /* backwards compatibility to xterm */
2368                         term.esc = 0;
2369                         strhandle();
2370                         break;
2371                 default:
2372                         if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2373                                 memmove(&strescseq.buf[strescseq.len], c, len);
2374                                 strescseq.len += len;
2375                         } else {
2376                         /*
2377                          * Here is a bug in terminals. If the user never sends
2378                          * some code to stop the str or esc command, then st
2379                          * will stop responding. But this is better than
2380                          * silently failing with unknown characters. At least
2381                          * then users will report back.
2382                          *
2383                          * In the case users ever get fixed, here is the code:
2384                          */
2385                         /*
2386                          * term.esc = 0;
2387                          * strhandle();
2388                          */
2389                         }
2390                 }
2391                 return;
2392         }
2393
2394         /*
2395          * Actions of control codes must be performed as soon they arrive
2396          * because they can be embedded inside a control sequence, and
2397          * they must not cause conflicts with sequences.
2398          */
2399         if(control) {
2400                 switch(ascii) {
2401                 case '\t':   /* HT */
2402                         tputtab(1);
2403                         return;
2404                 case '\b':   /* BS */
2405                         tmoveto(term.c.x-1, term.c.y);
2406                         return;
2407                 case '\r':   /* CR */
2408                         tmoveto(0, term.c.y);
2409                         return;
2410                 case '\f':   /* LF */
2411                 case '\v':   /* VT */
2412                 case '\n':   /* LF */
2413                         /* go to first col if the mode is set */
2414                         tnewline(IS_SET(MODE_CRLF));
2415                         return;
2416                 case '\a':   /* BEL */
2417                         if(!(xw.state & WIN_FOCUSED))
2418                                 xseturgency(1);
2419                         if (bellvolume)
2420                                 XBell(xw.dpy, bellvolume);
2421                         return;
2422                 case '\033': /* ESC */
2423                         csireset();
2424                         term.esc = ESC_START;
2425                         return;
2426                 case '\016': /* SO */
2427                         term.charset = 0;
2428                         tselcs();
2429                         return;
2430                 case '\017': /* SI */
2431                         term.charset = 1;
2432                         tselcs();
2433                         return;
2434                 case '\032': /* SUB */
2435                 case '\030': /* CAN */
2436                         csireset();
2437                         return;
2438                 case '\005': /* ENQ (IGNORED) */
2439                 case '\000': /* NUL (IGNORED) */
2440                 case '\021': /* XON (IGNORED) */
2441                 case '\023': /* XOFF (IGNORED) */
2442                 case 0177:   /* DEL (IGNORED) */
2443                         return;
2444                 }
2445         } else if(term.esc & ESC_START) {
2446                 if(term.esc & ESC_CSI) {
2447                         csiescseq.buf[csiescseq.len++] = ascii;
2448                         if(BETWEEN(ascii, 0x40, 0x7E)
2449                                         || csiescseq.len >= \
2450                                         sizeof(csiescseq.buf)-1) {
2451                                 term.esc = 0;
2452                                 csiparse();
2453                                 csihandle();
2454                         }
2455                 } else if(term.esc & ESC_ALTCHARSET) {
2456                         tdeftran(ascii);
2457                         tselcs();
2458                         term.esc = 0;
2459                 } else if(term.esc & ESC_TEST) {
2460                         if(ascii == '8') { /* DEC screen alignment test. */
2461                                 char E[UTF_SIZ] = "E";
2462                                 int x, y;
2463
2464                                 for(x = 0; x < term.col; ++x) {
2465                                         for(y = 0; y < term.row; ++y)
2466                                                 tsetchar(E, &term.c.attr, x, y);
2467                                 }
2468                         }
2469                         term.esc = 0;
2470                 } else {
2471                         switch(ascii) {
2472                         case '[':
2473                                 term.esc |= ESC_CSI;
2474                                 break;
2475                         case '#':
2476                                 term.esc |= ESC_TEST;
2477                                 break;
2478                         case 'P': /* DCS -- Device Control String */
2479                         case '_': /* APC -- Application Program Command */
2480                         case '^': /* PM -- Privacy Message */
2481                         case ']': /* OSC -- Operating System Command */
2482                         case 'k': /* old title set compatibility */
2483                                 strreset();
2484                                 strescseq.type = ascii;
2485                                 term.esc |= ESC_STR;
2486                                 break;
2487                         case '(': /* set primary charset G0 */
2488                         case ')': /* set secondary charset G1 */
2489                         case '*': /* set tertiary charset G2 */
2490                         case '+': /* set quaternary charset G3 */
2491                                 term.icharset = ascii - '(';
2492                                 term.esc |= ESC_ALTCHARSET;
2493                                 break;
2494                         case 'D': /* IND -- Linefeed */
2495                                 if(term.c.y == term.bot) {
2496                                         tscrollup(term.top, 1);
2497                                 } else {
2498                                         tmoveto(term.c.x, term.c.y+1);
2499                                 }
2500                                 term.esc = 0;
2501                                 break;
2502                         case 'E': /* NEL -- Next line */
2503                                 tnewline(1); /* always go to first col */
2504                                 term.esc = 0;
2505                                 break;
2506                         case 'H': /* HTS -- Horizontal tab stop */
2507                                 term.tabs[term.c.x] = 1;
2508                                 term.esc = 0;
2509                                 break;
2510                         case 'M': /* RI -- Reverse index */
2511                                 if(term.c.y == term.top) {
2512                                         tscrolldown(term.top, 1);
2513                                 } else {
2514                                         tmoveto(term.c.x, term.c.y-1);
2515                                 }
2516                                 term.esc = 0;
2517                                 break;
2518                         case 'Z': /* DECID -- Identify Terminal */
2519                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2520                                 term.esc = 0;
2521                                 break;
2522                         case 'c': /* RIS -- Reset to inital state */
2523                                 treset();
2524                                 term.esc = 0;
2525                                 xresettitle();
2526                                 xloadcols();
2527                                 break;
2528                         case '=': /* DECPAM -- Application keypad */
2529                                 term.mode |= MODE_APPKEYPAD;
2530                                 term.esc = 0;
2531                                 break;
2532                         case '>': /* DECPNM -- Normal keypad */
2533                                 term.mode &= ~MODE_APPKEYPAD;
2534                                 term.esc = 0;
2535                                 break;
2536                         case '7': /* DECSC -- Save Cursor */
2537                                 tcursor(CURSOR_SAVE);
2538                                 term.esc = 0;
2539                                 break;
2540                         case '8': /* DECRC -- Restore Cursor */
2541                                 tcursor(CURSOR_LOAD);
2542                                 term.esc = 0;
2543                                 break;
2544                         case '\\': /* ST -- String Terminator */
2545                                 if(term.esc & ESC_STR_END)
2546                                         strhandle();
2547                                 term.esc = 0;
2548                                 break;
2549                         default:
2550                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2551                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2552                                 term.esc = 0;
2553                         }
2554                 }
2555                 /*
2556                  * All characters which form part of a sequence are not
2557                  * printed
2558                  */
2559                 return;
2560         }
2561         /*
2562          * Display control codes only if we are in graphic mode
2563          */
2564         if(control && !(term.c.attr.mode & ATTR_GFX))
2565                 return;
2566         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2567                 selclear(NULL);
2568         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2569                 term.line[term.c.y][term.c.x].mode |= ATTR_WRAP;
2570                 tnewline(1);
2571         }
2572
2573         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col) {
2574                 memmove(&term.line[term.c.y][term.c.x+1],
2575                         &term.line[term.c.y][term.c.x],
2576                         (term.col - term.c.x - 1) * sizeof(Glyph));
2577         }
2578
2579         if(term.c.x+width > term.col)
2580                 tnewline(1);
2581
2582         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2583
2584         if(width == 2) {
2585                 term.line[term.c.y][term.c.x].mode |= ATTR_WIDE;
2586                 if(term.c.x+1 < term.col) {
2587                         term.line[term.c.y][term.c.x+1].c[0] = '\0';
2588                         term.line[term.c.y][term.c.x+1].mode = ATTR_WDUMMY;
2589                 }
2590         }
2591         if(term.c.x+width < term.col) {
2592                 tmoveto(term.c.x+width, term.c.y);
2593         } else {
2594                 term.c.state |= CURSOR_WRAPNEXT;
2595         }
2596 }
2597
2598 int
2599 tresize(int col, int row) {
2600         int i;
2601         int minrow = MIN(row, term.row);
2602         int mincol = MIN(col, term.col);
2603         int slide = term.c.y - row + 1;
2604         bool *bp;
2605         Line *orig;
2606
2607         if(col < 1 || row < 1)
2608                 return 0;
2609
2610         /* free unneeded rows */
2611         i = 0;
2612         if(slide > 0) {
2613                 /*
2614                  * slide screen to keep cursor where we expect it -
2615                  * tscrollup would work here, but we can optimize to
2616                  * memmove because we're freeing the earlier lines
2617                  */
2618                 for(/* i = 0 */; i < slide; i++) {
2619                         free(term.line[i]);
2620                         free(term.alt[i]);
2621                 }
2622                 memmove(term.line, term.line + slide, row * sizeof(Line));
2623                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2624         }
2625         for(i += row; i < term.row; i++) {
2626                 free(term.line[i]);
2627                 free(term.alt[i]);
2628         }
2629
2630         /* resize to new height */
2631         term.line = xrealloc(term.line, row * sizeof(Line));
2632         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2633         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2634         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2635
2636         /* resize each row to new width, zero-pad if needed */
2637         for(i = 0; i < minrow; i++) {
2638                 term.dirty[i] = 1;
2639                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2640                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2641         }
2642
2643         /* allocate any new rows */
2644         for(/* i == minrow */; i < row; i++) {
2645                 term.dirty[i] = 1;
2646                 term.line[i] = xmalloc(col * sizeof(Glyph));
2647                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2648         }
2649         if(col > term.col) {
2650                 bp = term.tabs + term.col;
2651
2652                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2653                 while(--bp > term.tabs && !*bp)
2654                         /* nothing */ ;
2655                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2656                         *bp = 1;
2657         }
2658         /* update terminal size */
2659         term.col = col;
2660         term.row = row;
2661         /* reset scrolling region */
2662         tsetscroll(0, row-1);
2663         /* make use of the LIMIT in tmoveto */
2664         tmoveto(term.c.x, term.c.y);
2665         /* Clearing both screens */
2666         orig = term.line;
2667         do {
2668                 if(mincol < col && 0 < minrow) {
2669                         tclearregion(mincol, 0, col - 1, minrow - 1);
2670                 }
2671                 if(0 < col && minrow < row) {
2672                         tclearregion(0, minrow, col - 1, row - 1);
2673                 }
2674                 tcursor(CURSOR_SAVE);
2675                 tswapscreen();
2676                 tcursor(CURSOR_LOAD);
2677         } while(orig != term.line);
2678
2679         return (slide > 0);
2680 }
2681
2682 void
2683 xresize(int col, int row) {
2684         xw.tw = MAX(1, col * xw.cw);
2685         xw.th = MAX(1, row * xw.ch);
2686
2687         XFreePixmap(xw.dpy, xw.buf);
2688         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2689                         DefaultDepth(xw.dpy, xw.scr));
2690         XftDrawChange(xw.draw, xw.buf);
2691         xclear(0, 0, xw.w, xw.h);
2692 }
2693
2694 static inline ushort
2695 sixd_to_16bit(int x) {
2696         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2697 }
2698
2699 void
2700 xloadcols(void) {
2701         int i, r, g, b;
2702         XRenderColor color = { .alpha = 0xffff };
2703         static bool loaded;
2704         Colour *cp;
2705
2706         if(loaded) {
2707                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2708                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2709         }
2710
2711         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2712         for(i = 0; i < LEN(colorname); i++) {
2713                 if(!colorname[i])
2714                         continue;
2715                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2716                         die("Could not allocate color '%s'\n", colorname[i]);
2717                 }
2718         }
2719
2720         /* load colors [16-255] ; same colors as xterm */
2721         for(i = 16, r = 0; r < 6; r++) {
2722                 for(g = 0; g < 6; g++) {
2723                         for(b = 0; b < 6; b++) {
2724                                 color.red = sixd_to_16bit(r);
2725                                 color.green = sixd_to_16bit(g);
2726                                 color.blue = sixd_to_16bit(b);
2727                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i])) {
2728                                         die("Could not allocate color %d\n", i);
2729                                 }
2730                                 i++;
2731                         }
2732                 }
2733         }
2734
2735         for(r = 0; r < 24; r++, i++) {
2736                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
2737                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
2738                                         &dc.col[i])) {
2739                         die("Could not allocate color %d\n", i);
2740                 }
2741         }
2742         loaded = true;
2743 }
2744
2745 int
2746 xsetcolorname(int x, const char *name) {
2747         XRenderColor color = { .alpha = 0xffff };
2748         Colour colour;
2749         if(!BETWEEN(x, 0, LEN(colorname)))
2750                 return -1;
2751         if(!name) {
2752                 if(BETWEEN(x, 16, 16 + 215)) {
2753                         int r = (x - 16) / 36, g = ((x - 16) % 36) / 6, b = (x - 16) % 6;
2754                         color.red = sixd_to_16bit(r);
2755                         color.green = sixd_to_16bit(g);
2756                         color.blue = sixd_to_16bit(b);
2757                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2758                                 return 0; /* something went wrong */
2759                         dc.col[x] = colour;
2760                         return 1;
2761                 } else if(BETWEEN(x, 16 + 216, 255)) {
2762                         color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x - (16 + 216));
2763                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2764                                 return 0; /* something went wrong */
2765                         dc.col[x] = colour;
2766                         return 1;
2767                 } else {
2768                         name = colorname[x];
2769                 }
2770         }
2771         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &colour))
2772                 return 0;
2773         dc.col[x] = colour;
2774         return 1;
2775 }
2776
2777 void
2778 xtermclear(int col1, int row1, int col2, int row2) {
2779         XftDrawRect(xw.draw,
2780                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2781                         borderpx + col1 * xw.cw,
2782                         borderpx + row1 * xw.ch,
2783                         (col2-col1+1) * xw.cw,
2784                         (row2-row1+1) * xw.ch);
2785 }
2786
2787 /*
2788  * Absolute coordinates.
2789  */
2790 void
2791 xclear(int x1, int y1, int x2, int y2) {
2792         XftDrawRect(xw.draw,
2793                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2794                         x1, y1, x2-x1, y2-y1);
2795 }
2796
2797 void
2798 xhints(void) {
2799         XClassHint class = {opt_class ? opt_class : termname, termname};
2800         XWMHints wm = {.flags = InputHint, .input = 1};
2801         XSizeHints *sizeh = NULL;
2802
2803         sizeh = XAllocSizeHints();
2804
2805         sizeh->flags = PSize | PResizeInc | PBaseSize;
2806         sizeh->height = xw.h;
2807         sizeh->width = xw.w;
2808         sizeh->height_inc = xw.ch;
2809         sizeh->width_inc = xw.cw;
2810         sizeh->base_height = 2 * borderpx;
2811         sizeh->base_width = 2 * borderpx;
2812         if(xw.isfixed == True) {
2813                 sizeh->flags |= PMaxSize | PMinSize;
2814                 sizeh->min_width = sizeh->max_width = xw.w;
2815                 sizeh->min_height = sizeh->max_height = xw.h;
2816         }
2817         if(xw.gm & (XValue|YValue)) {
2818                 sizeh->flags |= USPosition | PWinGravity;
2819                 sizeh->x = xw.l;
2820                 sizeh->y = xw.t;
2821                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2822         }
2823
2824         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2825                         &class);
2826         XFree(sizeh);
2827 }
2828
2829 int
2830 xgeommasktogravity(int mask) {
2831         switch(mask & (XNegative|YNegative)) {
2832         case 0:
2833                 return NorthWestGravity;
2834         case XNegative:
2835                 return NorthEastGravity;
2836         case YNegative:
2837                 return SouthWestGravity;
2838         }
2839         return SouthEastGravity;
2840 }
2841
2842 int
2843 xloadfont(Font *f, FcPattern *pattern) {
2844         FcPattern *match;
2845         FcResult result;
2846
2847         match = FcFontMatch(NULL, pattern, &result);
2848         if(!match)
2849                 return 1;
2850
2851         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2852                 FcPatternDestroy(match);
2853                 return 1;
2854         }
2855
2856         f->set = NULL;
2857         f->pattern = FcPatternDuplicate(pattern);
2858
2859         f->ascent = f->match->ascent;
2860         f->descent = f->match->descent;
2861         f->lbearing = 0;
2862         f->rbearing = f->match->max_advance_width;
2863
2864         f->height = f->ascent + f->descent;
2865         f->width = f->lbearing + f->rbearing;
2866
2867         return 0;
2868 }
2869
2870 void
2871 xloadfonts(char *fontstr, double fontsize) {
2872         FcPattern *pattern;
2873         FcResult r_sz, r_psz;
2874         double fontval;
2875
2876         if(fontstr[0] == '-') {
2877                 pattern = XftXlfdParse(fontstr, False, False);
2878         } else {
2879                 pattern = FcNameParse((FcChar8 *)fontstr);
2880         }
2881
2882         if(!pattern)
2883                 die("st: can't open font %s\n", fontstr);
2884
2885         if(fontsize > 0) {
2886                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2887                 FcPatternDel(pattern, FC_SIZE);
2888                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2889                 usedfontsize = fontsize;
2890         } else {
2891                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2892                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2893                 if(r_psz == FcResultMatch) {
2894                         usedfontsize = fontval;
2895                 } else if(r_sz == FcResultMatch) {
2896                         usedfontsize = -1;
2897                 } else {
2898                         /*
2899                          * Default font size is 12, if none given. This is to
2900                          * have a known usedfontsize value.
2901                          */
2902                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2903                         usedfontsize = 12;
2904                 }
2905         }
2906
2907         FcConfigSubstitute(0, pattern, FcMatchPattern);
2908         FcDefaultSubstitute(pattern);
2909
2910         if(xloadfont(&dc.font, pattern))
2911                 die("st: can't open font %s\n", fontstr);
2912
2913         if(usedfontsize < 0) {
2914                 FcPatternGetDouble(dc.font.match->pattern,
2915                                    FC_PIXEL_SIZE, 0, &fontval);
2916                 usedfontsize = fontval;
2917         }
2918
2919         /* Setting character width and height. */
2920         xw.cw = CEIL(dc.font.width * cwscale);
2921         xw.ch = CEIL(dc.font.height * chscale);
2922
2923         FcPatternDel(pattern, FC_SLANT);
2924         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2925         if(xloadfont(&dc.ifont, pattern))
2926                 die("st: can't open font %s\n", fontstr);
2927
2928         FcPatternDel(pattern, FC_WEIGHT);
2929         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2930         if(xloadfont(&dc.ibfont, pattern))
2931                 die("st: can't open font %s\n", fontstr);
2932
2933         FcPatternDel(pattern, FC_SLANT);
2934         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2935         if(xloadfont(&dc.bfont, pattern))
2936                 die("st: can't open font %s\n", fontstr);
2937
2938         FcPatternDestroy(pattern);
2939 }
2940
2941 int
2942 xloadfontset(Font *f) {
2943         FcResult result;
2944
2945         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
2946                 return 1;
2947         return 0;
2948 }
2949
2950 void
2951 xunloadfont(Font *f) {
2952         XftFontClose(xw.dpy, f->match);
2953         FcPatternDestroy(f->pattern);
2954         if(f->set)
2955                 FcFontSetDestroy(f->set);
2956 }
2957
2958 void
2959 xunloadfonts(void) {
2960         int i;
2961
2962         /* Free the loaded fonts in the font cache.  */
2963         for(i = 0; i < frclen; i++) {
2964                 XftFontClose(xw.dpy, frc[i].font);
2965         }
2966         frclen = 0;
2967
2968         xunloadfont(&dc.font);
2969         xunloadfont(&dc.bfont);
2970         xunloadfont(&dc.ifont);
2971         xunloadfont(&dc.ibfont);
2972 }
2973
2974 void
2975 xzoom(const Arg *arg) {
2976         xunloadfonts();
2977         xloadfonts(usedfont, usedfontsize + arg->i);
2978         cresize(0, 0);
2979         redraw(0);
2980 }
2981
2982 void
2983 xinit(void) {
2984         XGCValues gcvalues;
2985         Cursor cursor;
2986         Window parent;
2987         pid_t thispid = getpid();
2988
2989         if(!(xw.dpy = XOpenDisplay(NULL)))
2990                 die("Can't open display\n");
2991         xw.scr = XDefaultScreen(xw.dpy);
2992         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
2993
2994         /* font */
2995         if(!FcInit())
2996                 die("Could not init fontconfig.\n");
2997
2998         usedfont = (opt_font == NULL)? font : opt_font;
2999         xloadfonts(usedfont, 0);
3000
3001         /* colors */
3002         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3003         xloadcols();
3004
3005         /* adjust fixed window geometry */
3006         xw.w = 2 * borderpx + term.col * xw.cw;
3007         xw.h = 2 * borderpx + term.row * xw.ch;
3008         if(xw.gm & XNegative)
3009                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3010         if(xw.gm & YNegative)
3011                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3012
3013         /* Events */
3014         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3015         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3016         xw.attrs.bit_gravity = NorthWestGravity;
3017         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3018                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3019                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3020         xw.attrs.colormap = xw.cmap;
3021
3022         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3023                         XRootWindow(xw.dpy, xw.scr);
3024         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3025                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3026                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3027                         | CWEventMask | CWColormap, &xw.attrs);
3028
3029         memset(&gcvalues, 0, sizeof(gcvalues));
3030         gcvalues.graphics_exposures = False;
3031         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3032                         &gcvalues);
3033         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3034                         DefaultDepth(xw.dpy, xw.scr));
3035         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3036         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3037
3038         /* Xft rendering context */
3039         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3040
3041         /* input methods */
3042         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3043                 XSetLocaleModifiers("@im=local");
3044                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3045                         XSetLocaleModifiers("@im=");
3046                         if((xw.xim = XOpenIM(xw.dpy,
3047                                         NULL, NULL, NULL)) == NULL) {
3048                                 die("XOpenIM failed. Could not open input"
3049                                         " device.\n");
3050                         }
3051                 }
3052         }
3053         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3054                                            | XIMStatusNothing, XNClientWindow, xw.win,
3055                                            XNFocusWindow, xw.win, NULL);
3056         if(xw.xic == NULL)
3057                 die("XCreateIC failed. Could not obtain input method.\n");
3058
3059         /* white cursor, black outline */
3060         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3061         XDefineCursor(xw.dpy, xw.win, cursor);
3062         XRecolorCursor(xw.dpy, cursor,
3063                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3064                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3065
3066         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3067         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3068         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3069         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3070
3071         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3072         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3073                         PropModeReplace, (uchar *)&thispid, 1);
3074
3075         xresettitle();
3076         XMapWindow(xw.dpy, xw.win);
3077         xhints();
3078         XSync(xw.dpy, False);
3079 }
3080
3081 void
3082 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3083         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3084             width = charlen * xw.cw, xp, i;
3085         int frcflags;
3086         int u8fl, u8fblen, u8cblen, doesexist;
3087         char *u8c, *u8fs;
3088         long unicodep;
3089         Font *font = &dc.font;
3090         FcResult fcres;
3091         FcPattern *fcpattern, *fontpattern;
3092         FcFontSet *fcsets[] = { NULL };
3093         FcCharSet *fccharset;
3094         Colour *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3095         XRenderColor colfg, colbg;
3096         XRectangle r;
3097         int oneatatime;
3098
3099         frcflags = FRC_NORMAL;
3100
3101         if(base.mode & ATTR_ITALIC) {
3102                 if(base.fg == defaultfg)
3103                         base.fg = defaultitalic;
3104                 font = &dc.ifont;
3105                 frcflags = FRC_ITALIC;
3106         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3107                 if(base.fg == defaultfg)
3108                         base.fg = defaultitalic;
3109                 font = &dc.ibfont;
3110                 frcflags = FRC_ITALICBOLD;
3111         } else if(base.mode & ATTR_UNDERLINE) {
3112                 if(base.fg == defaultfg)
3113                         base.fg = defaultunderline;
3114         }
3115
3116         if(IS_TRUECOL(base.fg)) {
3117                 colfg.alpha = 0xffff;
3118                 colfg.red = TRUERED(base.fg);
3119                 colfg.green = TRUEGREEN(base.fg);
3120                 colfg.blue = TRUEBLUE(base.fg);
3121                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3122                 fg = &truefg;
3123         } else {
3124                 fg = &dc.col[base.fg];
3125         }
3126
3127         if(IS_TRUECOL(base.bg)) {
3128                 colbg.alpha = 0xffff;
3129                 colbg.green = TRUEGREEN(base.bg);
3130                 colbg.red = TRUERED(base.bg);
3131                 colbg.blue = TRUEBLUE(base.bg);
3132                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3133                 bg = &truebg;
3134         } else {
3135                 bg = &dc.col[base.bg];
3136         }
3137
3138         if(base.mode & ATTR_BOLD) {
3139                 if(BETWEEN(base.fg, 0, 7)) {
3140                         /* basic system colors */
3141                         fg = &dc.col[base.fg + 8];
3142                 } else if(BETWEEN(base.fg, 16, 195)) {
3143                         /* 256 colors */
3144                         fg = &dc.col[base.fg + 36];
3145                 } else if(BETWEEN(base.fg, 232, 251)) {
3146                         /* greyscale */
3147                         fg = &dc.col[base.fg + 4];
3148                 }
3149                 /*
3150                  * Those ranges will not be brightened:
3151                  *    8 - 15 – bright system colors
3152                  *    196 - 231 – highest 256 color cube
3153                  *    252 - 255 – brightest colors in greyscale
3154                  */
3155                 font = &dc.bfont;
3156                 frcflags = FRC_BOLD;
3157         }
3158
3159         if(IS_SET(MODE_REVERSE)) {
3160                 if(fg == &dc.col[defaultfg]) {
3161                         fg = &dc.col[defaultbg];
3162                 } else {
3163                         colfg.red = ~fg->color.red;
3164                         colfg.green = ~fg->color.green;
3165                         colfg.blue = ~fg->color.blue;
3166                         colfg.alpha = fg->color.alpha;
3167                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3168                                         &revfg);
3169                         fg = &revfg;
3170                 }
3171
3172                 if(bg == &dc.col[defaultbg]) {
3173                         bg = &dc.col[defaultfg];
3174                 } else {
3175                         colbg.red = ~bg->color.red;
3176                         colbg.green = ~bg->color.green;
3177                         colbg.blue = ~bg->color.blue;
3178                         colbg.alpha = bg->color.alpha;
3179                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3180                                         &revbg);
3181                         bg = &revbg;
3182                 }
3183         }
3184
3185         if(base.mode & ATTR_REVERSE) {
3186                 temp = fg;
3187                 fg = bg;
3188                 bg = temp;
3189         }
3190
3191         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3192                 fg = bg;
3193
3194         /* Intelligent cleaning up of the borders. */
3195         if(x == 0) {
3196                 xclear(0, (y == 0)? 0 : winy, borderpx,
3197                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3198         }
3199         if(x + charlen >= term.col) {
3200                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3201                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3202         }
3203         if(y == 0)
3204                 xclear(winx, 0, winx + width, borderpx);
3205         if(y == term.row-1)
3206                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3207
3208         /* Clean up the region we want to draw to. */
3209         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3210
3211         /* Set the clip region because Xft is sometimes dirty. */
3212         r.x = 0;
3213         r.y = 0;
3214         r.height = xw.ch;
3215         r.width = width;
3216         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3217
3218         for(xp = winx; bytelen > 0;) {
3219                 /*
3220                  * Search for the range in the to be printed string of glyphs
3221                  * that are in the main font. Then print that range. If
3222                  * some glyph is found that is not in the font, do the
3223                  * fallback dance.
3224                  */
3225                 u8fs = s;
3226                 u8fblen = 0;
3227                 u8fl = 0;
3228                 oneatatime = font->width != xw.cw;
3229                 for(;;) {
3230                         u8c = s;
3231                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3232                         s += u8cblen;
3233                         bytelen -= u8cblen;
3234
3235                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3236                         if(oneatatime || !doesexist || bytelen <= 0) {
3237                                 if(oneatatime || bytelen <= 0) {
3238                                         if(doesexist) {
3239                                                 u8fl++;
3240                                                 u8fblen += u8cblen;
3241                                         }
3242                                 }
3243
3244                                 if(u8fl > 0) {
3245                                         XftDrawStringUtf8(xw.draw, fg,
3246                                                         font->match, xp,
3247                                                         winy + font->ascent,
3248                                                         (FcChar8 *)u8fs,
3249                                                         u8fblen);
3250                                         xp += xw.cw * u8fl;
3251
3252                                 }
3253                                 break;
3254                         }
3255
3256                         u8fl++;
3257                         u8fblen += u8cblen;
3258                 }
3259                 if(doesexist) {
3260                         if(oneatatime)
3261                                 continue;
3262                         break;
3263                 }
3264
3265                 /* Search the font cache. */
3266                 for(i = 0; i < frclen; i++) {
3267                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3268                                         && frc[i].flags == frcflags) {
3269                                 break;
3270                         }
3271                 }
3272
3273                 /* Nothing was found. */
3274                 if(i >= frclen) {
3275                         if(!font->set)
3276                                 xloadfontset(font);
3277                         fcsets[0] = font->set;
3278
3279                         /*
3280                          * Nothing was found in the cache. Now use
3281                          * some dozen of Fontconfig calls to get the
3282                          * font for one single character.
3283                          *
3284                          * Xft and fontconfig are design failures.
3285                          */
3286                         fcpattern = FcPatternDuplicate(font->pattern);
3287                         fccharset = FcCharSetCreate();
3288
3289                         FcCharSetAddChar(fccharset, unicodep);
3290                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3291                                         fccharset);
3292                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3293                                         FcTrue);
3294
3295                         FcConfigSubstitute(0, fcpattern,
3296                                         FcMatchPattern);
3297                         FcDefaultSubstitute(fcpattern);
3298
3299                         fontpattern = FcFontSetMatch(0, fcsets,
3300                                         FcTrue, fcpattern, &fcres);
3301
3302                         /*
3303                          * Overwrite or create the new cache entry.
3304                          */
3305                         if(frclen >= LEN(frc)) {
3306                                 frclen = LEN(frc) - 1;
3307                                 XftFontClose(xw.dpy, frc[frclen].font);
3308                         }
3309
3310                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3311                                         fontpattern);
3312                         frc[frclen].flags = frcflags;
3313
3314                         i = frclen;
3315                         frclen++;
3316
3317                         FcPatternDestroy(fcpattern);
3318                         FcCharSetDestroy(fccharset);
3319                 }
3320
3321                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3322                                 xp, winy + frc[i].font->ascent,
3323                                 (FcChar8 *)u8c, u8cblen);
3324
3325                 xp += xw.cw * wcwidth(unicodep);
3326         }
3327
3328         /*
3329          * This is how the loop above actually should be. Why does the
3330          * application have to care about font details?
3331          *
3332          * I have to repeat: Xft and Fontconfig are design failures.
3333          */
3334         /*
3335         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3336                         winy + font->ascent, (FcChar8 *)s, bytelen);
3337         */
3338
3339         if(base.mode & ATTR_UNDERLINE) {
3340                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3341                                 width, 1);
3342         }
3343
3344         /* Reset clip to none. */
3345         XftDrawSetClip(xw.draw, 0);
3346 }
3347
3348 void
3349 xdrawcursor(void) {
3350         static int oldx = 0, oldy = 0;
3351         int sl, width, curx;
3352         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3353
3354         LIMIT(oldx, 0, term.col-1);
3355         LIMIT(oldy, 0, term.row-1);
3356
3357         curx = term.c.x;
3358
3359         /* adjust position if in dummy */
3360         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3361                 oldx--;
3362         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3363                 curx--;
3364
3365         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3366
3367         /* remove the old cursor */
3368         sl = utf8len(term.line[oldy][oldx].c);
3369         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3370         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3371                         oldy, width, sl);
3372
3373         /* draw the new one */
3374         if(!(IS_SET(MODE_HIDE))) {
3375                 if(xw.state & WIN_FOCUSED) {
3376                         if(IS_SET(MODE_REVERSE)) {
3377                                 g.mode |= ATTR_REVERSE;
3378                                 g.fg = defaultcs;
3379                                 g.bg = defaultfg;
3380                         }
3381
3382                         sl = utf8len(g.c);
3383                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3384                                 ? 2 : 1;
3385                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3386                 } else {
3387                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3388                                         borderpx + curx * xw.cw,
3389                                         borderpx + term.c.y * xw.ch,
3390                                         xw.cw - 1, 1);
3391                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3392                                         borderpx + curx * xw.cw,
3393                                         borderpx + term.c.y * xw.ch,
3394                                         1, xw.ch - 1);
3395                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3396                                         borderpx + (curx + 1) * xw.cw - 1,
3397                                         borderpx + term.c.y * xw.ch,
3398                                         1, xw.ch - 1);
3399                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3400                                         borderpx + curx * xw.cw,
3401                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3402                                         xw.cw, 1);
3403                 }
3404                 oldx = curx, oldy = term.c.y;
3405         }
3406 }
3407
3408
3409 void
3410 xsettitle(char *p) {
3411         XTextProperty prop;
3412
3413         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3414                         &prop);
3415         XSetWMName(xw.dpy, xw.win, &prop);
3416         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3417         XFree(prop.value);
3418 }
3419
3420 void
3421 xresettitle(void) {
3422         xsettitle(opt_title ? opt_title : "st");
3423 }
3424
3425 void
3426 redraw(int timeout) {
3427         struct timespec tv = {0, timeout * 1000};
3428
3429         draw();
3430
3431         if(timeout > 0) {
3432                 nanosleep(&tv, NULL);
3433                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3434         }
3435 }
3436
3437 void
3438 draw(void) {
3439         drawregion(0, 0, term.col, term.row);
3440         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3441                         xw.h, 0, 0);
3442         XSetForeground(xw.dpy, dc.gc,
3443                         dc.col[IS_SET(MODE_REVERSE)?
3444                                 defaultfg : defaultbg].pixel);
3445 }
3446
3447 void
3448 drawregion(int x1, int y1, int x2, int y2) {
3449         int ic, ib, x, y, ox, sl;
3450         Glyph base, new;
3451         char buf[DRAW_BUF_SIZ];
3452         bool ena_sel = sel.ob.x != -1;
3453         long unicodep;
3454
3455         if(sel.alt != IS_SET(MODE_ALTSCREEN))
3456                 ena_sel = 0;
3457
3458         if(!(xw.state & WIN_VISIBLE))
3459                 return;
3460
3461         for(y = y1; y < y2; y++) {
3462                 if(!term.dirty[y])
3463                         continue;
3464
3465                 xtermclear(0, y, term.col, y);
3466                 term.dirty[y] = 0;
3467                 base = term.line[y][0];
3468                 ic = ib = ox = 0;
3469                 for(x = x1; x < x2; x++) {
3470                         new = term.line[y][x];
3471                         if(new.mode == ATTR_WDUMMY)
3472                                 continue;
3473                         if(ena_sel && selected(x, y))
3474                                 new.mode ^= ATTR_REVERSE;
3475                         if(ib > 0 && (ATTRCMP(base, new)
3476                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3477                                 xdraws(buf, base, ox, y, ic, ib);
3478                                 ic = ib = 0;
3479                         }
3480                         if(ib == 0) {
3481                                 ox = x;
3482                                 base = new;
3483                         }
3484
3485                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3486                         memcpy(buf+ib, new.c, sl);
3487                         ib += sl;
3488                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3489                 }
3490                 if(ib > 0)
3491                         xdraws(buf, base, ox, y, ic, ib);
3492         }
3493         xdrawcursor();
3494 }
3495
3496 void
3497 expose(XEvent *ev) {
3498         XExposeEvent *e = &ev->xexpose;
3499
3500         if(xw.state & WIN_REDRAW) {
3501                 if(!e->count)
3502                         xw.state &= ~WIN_REDRAW;
3503         }
3504         redraw(0);
3505 }
3506
3507 void
3508 visibility(XEvent *ev) {
3509         XVisibilityEvent *e = &ev->xvisibility;
3510
3511         if(e->state == VisibilityFullyObscured) {
3512                 xw.state &= ~WIN_VISIBLE;
3513         } else if(!(xw.state & WIN_VISIBLE)) {
3514                 /* need a full redraw for next Expose, not just a buf copy */
3515                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3516         }
3517 }
3518
3519 void
3520 unmap(XEvent *ev) {
3521         xw.state &= ~WIN_VISIBLE;
3522 }
3523
3524 void
3525 xsetpointermotion(int set) {
3526         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3527         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3528 }
3529
3530 void
3531 xseturgency(int add) {
3532         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3533
3534         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
3535         XSetWMHints(xw.dpy, xw.win, h);
3536         XFree(h);
3537 }
3538
3539 void
3540 focus(XEvent *ev) {
3541         XFocusChangeEvent *e = &ev->xfocus;
3542
3543         if(e->mode == NotifyGrab)
3544                 return;
3545
3546         if(ev->type == FocusIn) {
3547                 XSetICFocus(xw.xic);
3548                 xw.state |= WIN_FOCUSED;
3549                 xseturgency(0);
3550                 if(IS_SET(MODE_FOCUS))
3551                         ttywrite("\033[I", 3);
3552         } else {
3553                 XUnsetICFocus(xw.xic);
3554                 xw.state &= ~WIN_FOCUSED;
3555                 if(IS_SET(MODE_FOCUS))
3556                         ttywrite("\033[O", 3);
3557         }
3558 }
3559
3560 static inline bool
3561 match(uint mask, uint state) {
3562         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3563 }
3564
3565 void
3566 numlock(const Arg *dummy) {
3567         term.numlock ^= 1;
3568 }
3569
3570 char*
3571 kmap(KeySym k, uint state) {
3572         Key *kp;
3573         int i;
3574
3575         /* Check for mapped keys out of X11 function keys. */
3576         for(i = 0; i < LEN(mappedkeys); i++) {
3577                 if(mappedkeys[i] == k)
3578                         break;
3579         }
3580         if(i == LEN(mappedkeys)) {
3581                 if((k & 0xFFFF) < 0xFD00)
3582                         return NULL;
3583         }
3584
3585         for(kp = key; kp < key + LEN(key); kp++) {
3586                 if(kp->k != k)
3587                         continue;
3588
3589                 if(!match(kp->mask, state))
3590                         continue;
3591
3592                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3593                         continue;
3594                 if(term.numlock && kp->appkey == 2)
3595                         continue;
3596
3597                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3598                         continue;
3599
3600                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3601                         continue;
3602
3603                 return kp->s;
3604         }
3605
3606         return NULL;
3607 }
3608
3609 void
3610 kpress(XEvent *ev) {
3611         XKeyEvent *e = &ev->xkey;
3612         KeySym ksym;
3613         char buf[32], *customkey;
3614         int len;
3615         long c;
3616         Status status;
3617         Shortcut *bp;
3618
3619         if(IS_SET(MODE_KBDLOCK))
3620                 return;
3621
3622         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3623         /* 1. shortcuts */
3624         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3625                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3626                         bp->func(&(bp->arg));
3627                         return;
3628                 }
3629         }
3630
3631         /* 2. custom keys from config.h */
3632         if((customkey = kmap(ksym, e->state))) {
3633                 ttysend(customkey, strlen(customkey));
3634                 return;
3635         }
3636
3637         /* 3. composed string from input method */
3638         if(len == 0)
3639                 return;
3640         if(len == 1 && e->state & Mod1Mask) {
3641                 if(IS_SET(MODE_8BIT)) {
3642                         if(*buf < 0177) {
3643                                 c = *buf | 0x80;
3644                                 len = utf8encode(c, buf, UTF_SIZ);
3645                         }
3646                 } else {
3647                         buf[1] = buf[0];
3648                         buf[0] = '\033';
3649                         len = 2;
3650                 }
3651         }
3652         ttysend(buf, len);
3653 }
3654
3655
3656 void
3657 cmessage(XEvent *e) {
3658         /*
3659          * See xembed specs
3660          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3661          */
3662         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3663                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3664                         xw.state |= WIN_FOCUSED;
3665                         xseturgency(0);
3666                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3667                         xw.state &= ~WIN_FOCUSED;
3668                 }
3669         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3670                 /* Send SIGHUP to shell */
3671                 kill(pid, SIGHUP);
3672                 exit(EXIT_SUCCESS);
3673         }
3674 }
3675
3676 void
3677 cresize(int width, int height) {
3678         int col, row;
3679
3680         if(width != 0)
3681                 xw.w = width;
3682         if(height != 0)
3683                 xw.h = height;
3684
3685         col = (xw.w - 2 * borderpx) / xw.cw;
3686         row = (xw.h - 2 * borderpx) / xw.ch;
3687
3688         tresize(col, row);
3689         xresize(col, row);
3690         ttyresize();
3691 }
3692
3693 void
3694 resize(XEvent *e) {
3695         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3696                 return;
3697
3698         cresize(e->xconfigure.width, e->xconfigure.height);
3699 }
3700
3701 void
3702 run(void) {
3703         XEvent ev;
3704         int w = xw.w, h = xw.h;
3705         fd_set rfd;
3706         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3707         struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
3708
3709         /* Waiting for window mapping */
3710         while(1) {
3711                 XNextEvent(xw.dpy, &ev);
3712                 if(ev.type == ConfigureNotify) {
3713                         w = ev.xconfigure.width;
3714                         h = ev.xconfigure.height;
3715                 } else if(ev.type == MapNotify) {
3716                         break;
3717                 }
3718         }
3719
3720         ttynew();
3721         cresize(w, h);
3722
3723         gettimeofday(&last, NULL);
3724         lastblink = last;
3725
3726         for(xev = actionfps;;) {
3727                 long deltatime;
3728
3729                 FD_ZERO(&rfd);
3730                 FD_SET(cmdfd, &rfd);
3731                 FD_SET(xfd, &rfd);
3732
3733                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3734                         if(errno == EINTR)
3735                                 continue;
3736                         die("select failed: %s\n", strerror(errno));
3737                 }
3738                 if(FD_ISSET(cmdfd, &rfd)) {
3739                         ttyread();
3740                         if(blinktimeout) {
3741                                 blinkset = tattrset(ATTR_BLINK);
3742                                 if(!blinkset)
3743                                         MODBIT(term.mode, 0, MODE_BLINK);
3744                         }
3745                 }
3746
3747                 if(FD_ISSET(xfd, &rfd))
3748                         xev = actionfps;
3749
3750                 gettimeofday(&now, NULL);
3751                 drawtimeout.tv_sec = 0;
3752                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3753                 tv = &drawtimeout;
3754
3755                 dodraw = 0;
3756                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3757                         tsetdirtattr(ATTR_BLINK);
3758                         term.mode ^= MODE_BLINK;
3759                         lastblink = now;
3760                         dodraw = 1;
3761                 }
3762                 deltatime = TIMEDIFF(now, last);
3763                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3764                                 || deltatime < 0) {
3765                         dodraw = 1;
3766                         last = now;
3767                 }
3768
3769                 if(dodraw) {
3770                         while(XPending(xw.dpy)) {
3771                                 XNextEvent(xw.dpy, &ev);
3772                                 if(XFilterEvent(&ev, None))
3773                                         continue;
3774                                 if(handler[ev.type])
3775                                         (handler[ev.type])(&ev);
3776                         }
3777
3778                         draw();
3779                         XFlush(xw.dpy);
3780
3781                         if(xev && !FD_ISSET(xfd, &rfd))
3782                                 xev--;
3783                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3784                                 if(blinkset) {
3785                                         if(TIMEDIFF(now, lastblink) \
3786                                                         > blinktimeout) {
3787                                                 drawtimeout.tv_usec = 1;
3788                                         } else {
3789                                                 drawtimeout.tv_usec = (1000 * \
3790                                                         (blinktimeout - \
3791                                                         TIMEDIFF(now,
3792                                                                 lastblink)));
3793                                         }
3794                                 } else {
3795                                         tv = NULL;
3796                                 }
3797                         }
3798                 }
3799         }
3800 }
3801
3802 void
3803 usage(void) {
3804         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3805         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3806         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3807 }
3808
3809 int
3810 main(int argc, char *argv[]) {
3811         char *titles;
3812         uint cols = 80, rows = 24;
3813
3814         xw.l = xw.t = 0;
3815         xw.isfixed = False;
3816
3817         ARGBEGIN {
3818         case 'a':
3819                 allowaltscreen = false;
3820                 break;
3821         case 'c':
3822                 opt_class = EARGF(usage());
3823                 break;
3824         case 'e':
3825                 /* eat all remaining arguments */
3826                 if(argc > 1) {
3827                         opt_cmd = &argv[1];
3828                         if(argv[1] != NULL && opt_title == NULL) {
3829                                 titles = xstrdup(argv[1]);
3830                                 opt_title = basename(titles);
3831                         }
3832                 }
3833                 goto run;
3834         case 'f':
3835                 opt_font = EARGF(usage());
3836                 break;
3837         case 'g':
3838                 xw.gm = XParseGeometry(EARGF(usage()),
3839                                 &xw.l, &xw.t, &cols, &rows);
3840                 break;
3841         case 'i':
3842                 xw.isfixed = True;
3843                 break;
3844         case 'o':
3845                 opt_io = EARGF(usage());
3846                 break;
3847         case 't':
3848                 opt_title = EARGF(usage());
3849                 break;
3850         case 'w':
3851                 opt_embed = EARGF(usage());
3852                 break;
3853         case 'v':
3854         default:
3855                 usage();
3856         } ARGEND;
3857
3858 run:
3859         setlocale(LC_CTYPE, "");
3860         XSetLocaleModifiers("");
3861         tnew(cols? cols : 1, rows? rows : 1);
3862         xinit();
3863         selinit();
3864         run();
3865
3866         return 0;
3867 }
3868