st.c

   1 /* See LICENSE for licence details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <stdint.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <libgen.h>
  24 #include <X11/Xatom.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <fontconfig/fontconfig.h>
  31 #include <wchar.h>
  32
  33 #include "arg.h"
  34
  35 char *argv0;
  36
  37 #define Glyph Glyph_
  38 #define Font Font_
  39
  40 #if   defined(__linux)
  41  #include <pty.h>
  42 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  43  #include <util.h>
  44 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  45  #include <libutil.h>
  46 #endif
  47
  48
  49 /* XEMBED messages */
  50 #define XEMBED_FOCUS_IN  4
  51 #define XEMBED_FOCUS_OUT 5
  52
  53 /* Arbitrary sizes */
  54 #define UTF_INVALID   0xFFFD
  55 #define UTF_SIZ       4
  56 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  57 #define ESC_ARG_SIZ   16
  58 #define STR_BUF_SIZ   ESC_BUF_SIZ
  59 #define STR_ARG_SIZ   ESC_ARG_SIZ
  60 #define DRAW_BUF_SIZ  20*1024
  61 #define XK_ANY_MOD    UINT_MAX
  62 #define XK_NO_MOD     0
  63 #define XK_SWITCH_MOD (1<<13)
  64
  65 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  66
  67 /* macros */
  68 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  69 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  70 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  71 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  72 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  73 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f))
  74 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  75 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  76 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  77 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  78 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  79 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_nsec-t2.tv_nsec)/1E6)
  80 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  81
  82 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  83 #define IS_TRUECOL(x)    (1 << 24 & (x))
  84 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  85 #define TRUEGREEN(x)     (((x) & 0xff00))
  86 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  87
  88
  89 enum glyph_attribute {
  90         ATTR_NULL      = 0,
  91         ATTR_BOLD      = 1,
  92         ATTR_FAINT     = 2,
  93         ATTR_ITALIC    = 4,
  94         ATTR_UNDERLINE = 8,
  95         ATTR_BLINK     = 16,
  96         ATTR_REVERSE   = 32,
  97         ATTR_INVISIBLE = 64,
  98         ATTR_STRUCK    = 128,
  99         ATTR_WRAP      = 256,
 100         ATTR_WIDE      = 512,
 101         ATTR_WDUMMY    = 1024,
 102 };
 103
 104 enum cursor_movement {
 105         CURSOR_SAVE,
 106         CURSOR_LOAD
 107 };
 108
 109 enum cursor_state {
 110         CURSOR_DEFAULT  = 0,
 111         CURSOR_WRAPNEXT = 1,
 112         CURSOR_ORIGIN   = 2
 113 };
 114
 115 enum term_mode {
 116         MODE_WRAP        = 1,
 117         MODE_INSERT      = 2,
 118         MODE_APPKEYPAD   = 4,
 119         MODE_ALTSCREEN   = 8,
 120         MODE_CRLF        = 16,
 121         MODE_MOUSEBTN    = 32,
 122         MODE_MOUSEMOTION = 64,
 123         MODE_REVERSE     = 128,
 124         MODE_KBDLOCK     = 256,
 125         MODE_HIDE        = 512,
 126         MODE_ECHO        = 1024,
 127         MODE_APPCURSOR   = 2048,
 128         MODE_MOUSESGR    = 4096,
 129         MODE_8BIT        = 8192,
 130         MODE_BLINK       = 16384,
 131         MODE_FBLINK      = 32768,
 132         MODE_FOCUS       = 65536,
 133         MODE_MOUSEX10    = 131072,
 134         MODE_MOUSEMANY   = 262144,
 135         MODE_BRCKTPASTE  = 524288,
 136         MODE_PRINT       = 1048576,
 137         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 138                           |MODE_MOUSEMANY,
 139 };
 140
 141 enum charset {
 142         CS_GRAPHIC0,
 143         CS_GRAPHIC1,
 144         CS_UK,
 145         CS_USA,
 146         CS_MULTI,
 147         CS_GER,
 148         CS_FIN
 149 };
 150
 151 enum escape_state {
 152         ESC_START      = 1,
 153         ESC_CSI        = 2,
 154         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 155         ESC_ALTCHARSET = 8,
 156         ESC_STR_END    = 16, /* a final string was encountered */
 157         ESC_TEST       = 32, /* Enter in test mode */
 158 };
 159
 160 enum window_state {
 161         WIN_VISIBLE = 1,
 162         WIN_REDRAW  = 2,
 163         WIN_FOCUSED = 4
 164 };
 165
 166 enum selection_type {
 167         SEL_REGULAR = 1,
 168         SEL_RECTANGULAR = 2
 169 };
 170
 171 enum selection_snap {
 172         SNAP_WORD = 1,
 173         SNAP_LINE = 2
 174 };
 175
 176 typedef unsigned char uchar;
 177 typedef unsigned int uint;
 178 typedef unsigned long ulong;
 179 typedef unsigned short ushort;
 180
 181 typedef XftDraw *Draw;
 182 typedef XftColor Color;
 183
 184 typedef struct {
 185         char c[UTF_SIZ]; /* character code */
 186         ushort mode;      /* attribute flags */
 187         uint32_t fg;      /* foreground  */
 188         uint32_t bg;      /* background  */
 189 } Glyph;
 190
 191 typedef Glyph *Line;
 192
 193 typedef struct {
 194         Glyph attr; /* current char attributes */
 195         int x;
 196         int y;
 197         char state;
 198 } TCursor;
 199
 200 /* CSI Escape sequence structs */
 201 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 202 typedef struct {
 203         char buf[ESC_BUF_SIZ]; /* raw string */
 204         int len;               /* raw string length */
 205         char priv;
 206         int arg[ESC_ARG_SIZ];
 207         int narg;              /* nb of args */
 208         char mode;
 209 } CSIEscape;
 210
 211 /* STR Escape sequence structs */
 212 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 213 typedef struct {
 214         char type;             /* ESC type ... */
 215         char buf[STR_BUF_SIZ]; /* raw string */
 216         int len;               /* raw string length */
 217         char *args[STR_ARG_SIZ];
 218         int narg;              /* nb of args */
 219 } STREscape;
 220
 221 /* Internal representation of the screen */
 222 typedef struct {
 223         int row;      /* nb row */
 224         int col;      /* nb col */
 225         Line *line;   /* screen */
 226         Line *alt;    /* alternate screen */
 227         bool *dirty;  /* dirtyness of lines */
 228         TCursor c;    /* cursor */
 229         int top;      /* top    scroll limit */
 230         int bot;      /* bottom scroll limit */
 231         int mode;     /* terminal mode flags */
 232         int esc;      /* escape state flags */
 233         char trantbl[4]; /* charset table translation */
 234         int charset;  /* current charset */
 235         int icharset; /* selected charset for sequence */
 236         bool numlock; /* lock numbers in keyboard */
 237         bool *tabs;
 238 } Term;
 239
 240 /* Purely graphic info */
 241 typedef struct {
 242         Display *dpy;
 243         Colormap cmap;
 244         Window win;
 245         Drawable buf;
 246         Atom xembed, wmdeletewin, netwmname, netwmpid;
 247         XIM xim;
 248         XIC xic;
 249         Draw draw;
 250         Visual *vis;
 251         XSetWindowAttributes attrs;
 252         int scr;
 253         bool isfixed; /* is fixed geometry? */
 254         int l, t; /* left and top offset */
 255         int gm; /* geometry mask */
 256         int tw, th; /* tty width and height */
 257         int w, h; /* window width and height */
 258         int ch; /* char height */
 259         int cw; /* char width  */
 260         char state; /* focus, redraw, visible */
 261 } XWindow;
 262
 263 typedef struct {
 264         uint b;
 265         uint mask;
 266         char *s;
 267 } Mousekey;
 268
 269 typedef struct {
 270         KeySym k;
 271         uint mask;
 272         char *s;
 273         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 274         signed char appkey;    /* application keypad */
 275         signed char appcursor; /* application cursor */
 276         signed char crlf;      /* crlf mode          */
 277 } Key;
 278
 279 typedef struct {
 280         int mode;
 281         int type;
 282         int snap;
 283         /*
 284          * Selection variables:
 285          * nb – normalized coordinates of the beginning of the selection
 286          * ne – normalized coordinates of the end of the selection
 287          * ob – original coordinates of the beginning of the selection
 288          * oe – original coordinates of the end of the selection
 289          */
 290         struct {
 291                 int x, y;
 292         } nb, ne, ob, oe;
 293
 294         char *clip;
 295         Atom xtarget;
 296         bool alt;
 297         struct timespec tclick1;
 298         struct timespec tclick2;
 299 } Selection;
 300
 301 typedef union {
 302         int i;
 303         uint ui;
 304         float f;
 305         const void *v;
 306 } Arg;
 307
 308 typedef struct {
 309         uint mod;
 310         KeySym keysym;
 311         void (*func)(const Arg *);
 312         const Arg arg;
 313 } Shortcut;
 314
 315 /* function definitions used in config.h */
 316 static void clippaste(const Arg *);
 317 static void numlock(const Arg *);
 318 static void selpaste(const Arg *);
 319 static void xzoom(const Arg *);
 320 static void printsel(const Arg *);
 321 static void printscreen(const Arg *) ;
 322 static void toggleprinter(const Arg *);
 323
 324 /* Config.h for applying patches and the configuration. */
 325 #include "config.h"
 326
 327 /* Font structure */
 328 typedef struct {
 329         int height;
 330         int width;
 331         int ascent;
 332         int descent;
 333         short lbearing;
 334         short rbearing;
 335         XftFont *match;
 336         FcFontSet *set;
 337         FcPattern *pattern;
 338 } Font;
 339
 340 /* Drawing Context */
 341 typedef struct {
 342         Color col[MAX(LEN(colorname), 256)];
 343         Font font, bfont, ifont, ibfont;
 344         GC gc;
 345 } DC;
 346
 347 static void die(const char *, ...);
 348 static void draw(void);
 349 static void redraw(int);
 350 static void drawregion(int, int, int, int);
 351 static void execsh(void);
 352 static void sigchld(int);
 353 static void run(void);
 354
 355 static void csidump(void);
 356 static void csihandle(void);
 357 static void csiparse(void);
 358 static void csireset(void);
 359 static void strdump(void);
 360 static void strhandle(void);
 361 static void strparse(void);
 362 static void strreset(void);
 363
 364 static int tattrset(int);
 365 static void tprinter(char *, size_t);
 366 static void tdumpsel(void);
 367 static void tdumpline(int);
 368 static void tdump(void);
 369 static void tclearregion(int, int, int, int);
 370 static void tcursor(int);
 371 static void tdeletechar(int);
 372 static void tdeleteline(int);
 373 static void tinsertblank(int);
 374 static void tinsertblankline(int);
 375 static int tlinelen(int);
 376 static void tmoveto(int, int);
 377 static void tmoveato(int, int);
 378 static void tnew(int, int);
 379 static void tnewline(int);
 380 static void tputtab(int);
 381 static void tputc(char *, int);
 382 static void treset(void);
 383 static void tresize(int, int);
 384 static void tscrollup(int, int);
 385 static void tscrolldown(int, int);
 386 static void tsetattr(int *, int);
 387 static void tsetchar(char *, Glyph *, int, int);
 388 static void tsetscroll(int, int);
 389 static void tswapscreen(void);
 390 static void tsetdirt(int, int);
 391 static void tsetdirtattr(int);
 392 static void tsetmode(bool, bool, int *, int);
 393 static void tfulldirt(void);
 394 static void techo(char *, int);
 395 static void tcontrolcode(uchar );
 396 static void tdectest(char );
 397 static int32_t tdefcolor(int *, int *, int);
 398 static void tdeftran(char);
 399 static inline bool match(uint, uint);
 400 static void ttynew(void);
 401 static void ttyread(void);
 402 static void ttyresize(void);
 403 static void ttysend(char *, size_t);
 404 static void ttywrite(const char *, size_t);
 405 static void tstrsequence(uchar c);
 406
 407 static void xdraws(char *, Glyph, int, int, int, int);
 408 static void xhints(void);
 409 static void xclear(int, int, int, int);
 410 static void xdrawcursor(void);
 411 static void xinit(void);
 412 static void xloadcols(void);
 413 static int xsetcolorname(int, const char *);
 414 static int xgeommasktogravity(int);
 415 static int xloadfont(Font *, FcPattern *);
 416 static void xloadfonts(char *, double);
 417 static int xloadfontset(Font *);
 418 static void xsettitle(char *);
 419 static void xresettitle(void);
 420 static void xsetpointermotion(int);
 421 static void xseturgency(int);
 422 static void xsetsel(char *);
 423 static void xtermclear(int, int, int, int);
 424 static void xunloadfont(Font *);
 425 static void xunloadfonts(void);
 426 static void xresize(int, int);
 427
 428 static void expose(XEvent *);
 429 static void visibility(XEvent *);
 430 static void unmap(XEvent *);
 431 static char *kmap(KeySym, uint);
 432 static void kpress(XEvent *);
 433 static void cmessage(XEvent *);
 434 static void cresize(int, int);
 435 static void resize(XEvent *);
 436 static void focus(XEvent *);
 437 static void brelease(XEvent *);
 438 static void bpress(XEvent *);
 439 static void bmotion(XEvent *);
 440 static void selnotify(XEvent *);
 441 static void selclear(XEvent *);
 442 static void selrequest(XEvent *);
 443
 444 static void selinit(void);
 445 static void selnormalize(void);
 446 static inline bool selected(int, int);
 447 static char *getsel(void);
 448 static void selcopy(void);
 449 static void selscroll(int, int);
 450 static void selsnap(int, int *, int *, int);
 451 static void getbuttoninfo(XEvent *);
 452 static void mousereport(XEvent *);
 453
 454 static size_t utf8decode(char *, long *, size_t);
 455 static long utf8decodebyte(char, size_t *);
 456 static size_t utf8encode(long, char *, size_t);
 457 static char utf8encodebyte(long, size_t);
 458 static size_t utf8len(char *);
 459 static size_t utf8validate(long *, size_t);
 460
 461 static ssize_t xwrite(int, const char *, size_t);
 462 static void *xmalloc(size_t);
 463 static void *xrealloc(void *, size_t);
 464 static char *xstrdup(char *);
 465
 466 static void usage(void);
 467
 468 static void (*handler[LASTEvent])(XEvent *) = {
 469         [KeyPress] = kpress,
 470         [ClientMessage] = cmessage,
 471         [ConfigureNotify] = resize,
 472         [VisibilityNotify] = visibility,
 473         [UnmapNotify] = unmap,
 474         [Expose] = expose,
 475         [FocusIn] = focus,
 476         [FocusOut] = focus,
 477         [MotionNotify] = bmotion,
 478         [ButtonPress] = bpress,
 479         [ButtonRelease] = brelease,
 480         [SelectionClear] = selclear,
 481         [SelectionNotify] = selnotify,
 482         [SelectionRequest] = selrequest,
 483 };
 484
 485 /* Globals */
 486 static DC dc;
 487 static XWindow xw;
 488 static Term term;
 489 static CSIEscape csiescseq;
 490 static STREscape strescseq;
 491 static int cmdfd;
 492 static pid_t pid;
 493 static Selection sel;
 494 static int iofd = STDOUT_FILENO;
 495 static char **opt_cmd = NULL;
 496 static char *opt_io = NULL;
 497 static char *opt_title = NULL;
 498 static char *opt_embed = NULL;
 499 static char *opt_class = NULL;
 500 static char *opt_font = NULL;
 501 static int oldbutton = 3; /* button event on startup: 3 = release */
 502
 503 static char *usedfont = NULL;
 504 static double usedfontsize = 0;
 505
 506 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 507 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 508 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 509 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 510
 511 /* Font Ring Cache */
 512 enum {
 513         FRC_NORMAL,
 514         FRC_ITALIC,
 515         FRC_BOLD,
 516         FRC_ITALICBOLD
 517 };
 518
 519 typedef struct {
 520         XftFont *font;
 521         int flags;
 522 } Fontcache;
 523
 524 /* Fontcache is an array now. A new font will be appended to the array. */
 525 static Fontcache frc[16];
 526 static int frclen = 0;
 527
 528 ssize_t
 529 xwrite(int fd, const char *s, size_t len) {
 530         size_t aux = len;
 531
 532         while(len > 0) {
 533                 ssize_t r = write(fd, s, len);
 534                 if(r < 0)
 535                         return r;
 536                 len -= r;
 537                 s += r;
 538         }
 539         return aux;
 540 }
 541
 542 void *
 543 xmalloc(size_t len) {
 544         void *p = malloc(len);
 545
 546         if(!p)
 547                 die("Out of memory\n");
 548
 549         return p;
 550 }
 551
 552 void *
 553 xrealloc(void *p, size_t len) {
 554         if((p = realloc(p, len)) == NULL)
 555                 die("Out of memory\n");
 556
 557         return p;
 558 }
 559
 560 char *
 561 xstrdup(char *s) {
 562         if((s = strdup(s)) == NULL)
 563                 die("Out of memory\n");
 564
 565         return s;
 566 }
 567
 568 size_t
 569 utf8decode(char *c, long *u, size_t clen) {
 570         size_t i, j, len, type;
 571         long udecoded;
 572
 573         *u = UTF_INVALID;
 574         if(!clen)
 575                 return 0;
 576         udecoded = utf8decodebyte(c[0], &len);
 577         if(!BETWEEN(len, 1, UTF_SIZ))
 578                 return 1;
 579         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 580                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 581                 if(type != 0)
 582                         return j;
 583         }
 584         if(j < len)
 585                 return 0;
 586         *u = udecoded;
 587         utf8validate(u, len);
 588         return len;
 589 }
 590
 591 long
 592 utf8decodebyte(char c, size_t *i) {
 593         for(*i = 0; *i < LEN(utfmask); ++(*i))
 594                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 595                         return (uchar)c & ~utfmask[*i];
 596         return 0;
 597 }
 598
 599 size_t
 600 utf8encode(long u, char *c, size_t clen) {
 601         size_t len, i;
 602
 603         len = utf8validate(&u, 0);
 604         if(clen < len)
 605                 return 0;
 606         for(i = len - 1; i != 0; --i) {
 607                 c[i] = utf8encodebyte(u, 0);
 608                 u >>= 6;
 609         }
 610         c[0] = utf8encodebyte(u, len);
 611         return len;
 612 }
 613
 614 char
 615 utf8encodebyte(long u, size_t i) {
 616         return utfbyte[i] | (u & ~utfmask[i]);
 617 }
 618
 619 size_t
 620 utf8len(char *c) {
 621         return utf8decode(c, &(long){0}, UTF_SIZ);
 622 }
 623
 624 size_t
 625 utf8validate(long *u, size_t i) {
 626         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 627                 *u = UTF_INVALID;
 628         for(i = 1; *u > utfmax[i]; ++i)
 629                 ;
 630         return i;
 631 }
 632
 633 static void
 634 selinit(void) {
 635         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 636         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 637         sel.mode = 0;
 638         sel.ob.x = -1;
 639         sel.clip = NULL;
 640         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 641         if(sel.xtarget == None)
 642                 sel.xtarget = XA_STRING;
 643 }
 644
 645 static int
 646 x2col(int x) {
 647         x -= borderpx;
 648         x /= xw.cw;
 649
 650         return LIMIT(x, 0, term.col-1);
 651 }
 652
 653 static int
 654 y2row(int y) {
 655         y -= borderpx;
 656         y /= xw.ch;
 657
 658         return LIMIT(y, 0, term.row-1);
 659 }
 660
 661 static int tlinelen(int y) {
 662         int i = term.col;
 663
 664         while (i > 0 && term.line[y][i - 1].c[0] == ' ')
 665                 --i;
 666
 667         return i;
 668 }
 669
 670 static void
 671 selnormalize(void) {
 672         int i;
 673
 674         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
 675                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 676                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 677         } else {
 678                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 679                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 680         }
 681         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 682         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 683
 684         /* expand selection over line breaks */
 685         if (sel.type == SEL_RECTANGULAR)
 686                 return;
 687         i = tlinelen(sel.nb.y);
 688         if (i < sel.nb.x)
 689                 sel.nb.x = i;
 690         if (tlinelen(sel.ne.y) <= sel.ne.x)
 691                 sel.ne.x = term.col - 1;
 692 }
 693
 694 static inline bool
 695 selected(int x, int y) {
 696         if(sel.type == SEL_RECTANGULAR)
 697                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 698                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 699
 700         return BETWEEN(y, sel.nb.y, sel.ne.y)
 701             && (y != sel.nb.y || x >= sel.nb.x)
 702             && (y != sel.ne.y || x <= sel.ne.x);
 703 }
 704
 705 void
 706 selsnap(int mode, int *x, int *y, int direction) {
 707         int newx, newy, xt, yt;
 708         Glyph *gp;
 709
 710         switch(mode) {
 711         case SNAP_WORD:
 712                 /*
 713                  * Snap around if the word wraps around at the end or
 714                  * beginning of a line.
 715                  */
 716                 for(;;) {
 717                         newx = *x + direction;
 718                         newy = *y;
 719                         if(!BETWEEN(newx, 0, term.col - 1)) {
 720                                 newy += direction;
 721                                 newx = (newx + term.col) % term.col;
 722                                 if (!BETWEEN(newy, 0, term.row - 1))
 723                                         break;
 724
 725                                 if(direction > 0)
 726                                         yt = *y, xt = *x;
 727                                 else
 728                                         yt = newy, xt = newx;
 729                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 730                                         break;
 731                         }
 732
 733                         if (newx >= tlinelen(newy))
 734                                 break;
 735
 736                         gp = &term.line[newy][newx];
 737                         if (!(gp->mode & ATTR_WDUMMY) && strchr(worddelimiters, gp->c[0]))
 738                                 break;
 739
 740                         *x = newx;
 741                         *y = newy;
 742                 }
 743                 break;
 744         case SNAP_LINE:
 745                 /*
 746                  * Snap around if the the previous line or the current one
 747                  * has set ATTR_WRAP at its end. Then the whole next or
 748                  * previous line will be selected.
 749                  */
 750                 *x = (direction < 0) ? 0 : term.col - 1;
 751                 if(direction < 0 && *y > 0) {
 752                         for(; *y > 0; *y += direction) {
 753                                 if(!(term.line[*y-1][term.col-1].mode
 754                                                 & ATTR_WRAP)) {
 755                                         break;
 756                                 }
 757                         }
 758                 } else if(direction > 0 && *y < term.row-1) {
 759                         for(; *y < term.row; *y += direction) {
 760                                 if(!(term.line[*y][term.col-1].mode
 761                                                 & ATTR_WRAP)) {
 762                                         break;
 763                                 }
 764                         }
 765                 }
 766                 break;
 767         }
 768 }
 769
 770 void
 771 getbuttoninfo(XEvent *e) {
 772         int type;
 773         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 774
 775         sel.alt = IS_SET(MODE_ALTSCREEN);
 776
 777         sel.oe.x = x2col(e->xbutton.x);
 778         sel.oe.y = y2row(e->xbutton.y);
 779
 780         if(sel.ob.y < sel.oe.y
 781                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 782                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 783                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 784         } else {
 785                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 786                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 787         }
 788         selnormalize();
 789
 790         sel.type = SEL_REGULAR;
 791         for(type = 1; type < LEN(selmasks); ++type) {
 792                 if(match(selmasks[type], state)) {
 793                         sel.type = type;
 794                         break;
 795                 }
 796         }
 797 }
 798
 799 void
 800 mousereport(XEvent *e) {
 801         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 802             button = e->xbutton.button, state = e->xbutton.state,
 803             len;
 804         char buf[40];
 805         static int ox, oy;
 806
 807         /* from urxvt */
 808         if(e->xbutton.type == MotionNotify) {
 809                 if(x == ox && y == oy)
 810                         return;
 811                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 812                         return;
 813                 /* MOUSE_MOTION: no reporting if no button is pressed */
 814                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 815                         return;
 816
 817                 button = oldbutton + 32;
 818                 ox = x;
 819                 oy = y;
 820         } else {
 821                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 822                         button = 3;
 823                 } else {
 824                         button -= Button1;
 825                         if(button >= 3)
 826                                 button += 64 - 3;
 827                 }
 828                 if(e->xbutton.type == ButtonPress) {
 829                         oldbutton = button;
 830                         ox = x;
 831                         oy = y;
 832                 } else if(e->xbutton.type == ButtonRelease) {
 833                         oldbutton = 3;
 834                         /* MODE_MOUSEX10: no button release reporting */
 835                         if(IS_SET(MODE_MOUSEX10))
 836                                 return;
 837                         if (button == 64 || button == 65)
 838                                 return;
 839                 }
 840         }
 841
 842         if(!IS_SET(MODE_MOUSEX10)) {
 843                 button += (state & ShiftMask   ? 4  : 0)
 844                         + (state & Mod4Mask    ? 8  : 0)
 845                         + (state & ControlMask ? 16 : 0);
 846         }
 847
 848         len = 0;
 849         if(IS_SET(MODE_MOUSESGR)) {
 850                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 851                                 button, x+1, y+1,
 852                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 853         } else if(x < 223 && y < 223) {
 854                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 855                                 32+button, 32+x+1, 32+y+1);
 856         } else {
 857                 return;
 858         }
 859
 860         ttywrite(buf, len);
 861 }
 862
 863 void
 864 bpress(XEvent *e) {
 865         struct timespec now;
 866         Mousekey *mk;
 867
 868         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 869                 mousereport(e);
 870                 return;
 871         }
 872
 873         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 874                 if(e->xbutton.button == mk->b
 875                                 && match(mk->mask, e->xbutton.state)) {
 876                         ttysend(mk->s, strlen(mk->s));
 877                         return;
 878                 }
 879         }
 880
 881         if(e->xbutton.button == Button1) {
 882                 clock_gettime(CLOCK_MONOTONIC, &now);
 883
 884                 /* Clear previous selection, logically and visually. */
 885                 selclear(NULL);
 886                 sel.mode = 1;
 887                 sel.type = SEL_REGULAR;
 888                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 889                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 890
 891                 /*
 892                  * If the user clicks below predefined timeouts specific
 893                  * snapping behaviour is exposed.
 894                  */
 895                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 896                         sel.snap = SNAP_LINE;
 897                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 898                         sel.snap = SNAP_WORD;
 899                 } else {
 900                         sel.snap = 0;
 901                 }
 902                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 903                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 904                 selnormalize();
 905
 906                 /*
 907                  * Draw selection, unless it's regular and we don't want to
 908                  * make clicks visible
 909                  */
 910                 if(sel.snap != 0) {
 911                         sel.mode++;
 912                         tsetdirt(sel.nb.y, sel.ne.y);
 913                 }
 914                 sel.tclick2 = sel.tclick1;
 915                 sel.tclick1 = now;
 916         }
 917 }
 918
 919 char *
 920 getsel(void) {
 921         char *str, *ptr;
 922         int y, bufsize, size, lastx, linelen;
 923         Glyph *gp, *last;
 924
 925         if(sel.ob.x == -1)
 926                 return NULL;
 927
 928         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 929         ptr = str = xmalloc(bufsize);
 930
 931         /* append every set & selected glyph to the selection */
 932         for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 933                 linelen = tlinelen(y);
 934
 935                 if(sel.type == SEL_RECTANGULAR) {
 936                         gp = &term.line[y][sel.nb.x];
 937                         lastx = sel.ne.x;
 938                 } else {
 939                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
 940                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 941                 }
 942                 last = &term.line[y][MIN(lastx, linelen-1)];
 943
 944                 for( ; gp <= last; ++gp) {
 945                         if(gp->mode & ATTR_WDUMMY)
 946                                 continue;
 947
 948                         size = utf8len(gp->c);
 949                         memcpy(ptr, gp->c, size);
 950                         ptr += size;
 951                 }
 952
 953                 /*
 954                  * Copy and pasting of line endings is inconsistent
 955                  * in the inconsistent terminal and GUI world.
 956                  * The best solution seems like to produce '\n' when
 957                  * something is copied from st and convert '\n' to
 958                  * '\r', when something to be pasted is received by
 959                  * st.
 960                  * FIXME: Fix the computer world.
 961                  */
 962                 if(sel.ne.y > y || lastx >= linelen)
 963                         *ptr++ = '\n';
 964         }
 965         *ptr = 0;
 966         return str;
 967 }
 968
 969 void
 970 selcopy(void) {
 971         xsetsel(getsel());
 972 }
 973
 974 void
 975 selnotify(XEvent *e) {
 976         ulong nitems, ofs, rem;
 977         int format;
 978         uchar *data, *last, *repl;
 979         Atom type;
 980
 981         ofs = 0;
 982         do {
 983                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 984                                         False, AnyPropertyType, &type, &format,
 985                                         &nitems, &rem, &data)) {
 986                         fprintf(stderr, "Clipboard allocation failed\n");
 987                         return;
 988                 }
 989
 990                 /*
 991                  * As seen in getsel:
 992                  * Line endings are inconsistent in the terminal and GUI world
 993                  * copy and pasting. When receiving some selection data,
 994                  * replace all '\n' with '\r'.
 995                  * FIXME: Fix the computer world.
 996                  */
 997                 repl = data;
 998                 last = data + nitems * format / 8;
 999                 while((repl = memchr(repl, '\n', last - repl))) {
1000                         *repl++ = '\r';
1001                 }
1002
1003                 if(IS_SET(MODE_BRCKTPASTE))
1004                         ttywrite("\033[200~", 6);
1005                 ttysend((char *)data, nitems * format / 8);
1006                 if(IS_SET(MODE_BRCKTPASTE))
1007                         ttywrite("\033[201~", 6);
1008                 XFree(data);
1009                 /* number of 32-bit chunks returned */
1010                 ofs += nitems * format / 32;
1011         } while(rem > 0);
1012 }
1013
1014 void
1015 selpaste(const Arg *dummy) {
1016         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1017                         xw.win, CurrentTime);
1018 }
1019
1020 void
1021 clippaste(const Arg *dummy) {
1022         Atom clipboard;
1023
1024         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1025         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1026                         xw.win, CurrentTime);
1027 }
1028
1029 void
1030 selclear(XEvent *e) {
1031         if(sel.ob.x == -1)
1032                 return;
1033         sel.ob.x = -1;
1034         tsetdirt(sel.nb.y, sel.ne.y);
1035 }
1036
1037 void
1038 selrequest(XEvent *e) {
1039         XSelectionRequestEvent *xsre;
1040         XSelectionEvent xev;
1041         Atom xa_targets, string;
1042
1043         xsre = (XSelectionRequestEvent *) e;
1044         xev.type = SelectionNotify;
1045         xev.requestor = xsre->requestor;
1046         xev.selection = xsre->selection;
1047         xev.target = xsre->target;
1048         xev.time = xsre->time;
1049         /* reject */
1050         xev.property = None;
1051
1052         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1053         if(xsre->target == xa_targets) {
1054                 /* respond with the supported type */
1055                 string = sel.xtarget;
1056                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1057                                 XA_ATOM, 32, PropModeReplace,
1058                                 (uchar *) &string, 1);
1059                 xev.property = xsre->property;
1060         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1061                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1062                                 xsre->target, 8, PropModeReplace,
1063                                 (uchar *) sel.clip, strlen(sel.clip));
1064                 xev.property = xsre->property;
1065         }
1066
1067         /* all done, send a notification to the listener */
1068         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1069                 fprintf(stderr, "Error sending SelectionNotify event\n");
1070 }
1071
1072 void
1073 xsetsel(char *str) {
1074         /* register the selection for both the clipboard and the primary */
1075         Atom clipboard;
1076
1077         free(sel.clip);
1078         sel.clip = str;
1079
1080         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1081
1082         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1083         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1084 }
1085
1086 void
1087 brelease(XEvent *e) {
1088         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1089                 mousereport(e);
1090                 return;
1091         }
1092
1093         if(e->xbutton.button == Button2) {
1094                 selpaste(NULL);
1095         } else if(e->xbutton.button == Button1) {
1096                 if(sel.mode < 2) {
1097                         selclear(NULL);
1098                 } else {
1099                         getbuttoninfo(e);
1100                         selcopy();
1101                 }
1102                 sel.mode = 0;
1103                 tsetdirt(sel.nb.y, sel.ne.y);
1104         }
1105 }
1106
1107 void
1108 bmotion(XEvent *e) {
1109         int oldey, oldex, oldsby, oldsey;
1110
1111         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1112                 mousereport(e);
1113                 return;
1114         }
1115
1116         if(!sel.mode)
1117                 return;
1118
1119         sel.mode++;
1120         oldey = sel.oe.y;
1121         oldex = sel.oe.x;
1122         oldsby = sel.nb.y;
1123         oldsey = sel.ne.y;
1124         getbuttoninfo(e);
1125
1126         if(oldey != sel.oe.y || oldex != sel.oe.x)
1127                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1128 }
1129
1130 void
1131 die(const char *errstr, ...) {
1132         va_list ap;
1133
1134         va_start(ap, errstr);
1135         vfprintf(stderr, errstr, ap);
1136         va_end(ap);
1137         exit(EXIT_FAILURE);
1138 }
1139
1140 void
1141 execsh(void) {
1142         char **args;
1143         char *envshell = getenv("SHELL");
1144         const struct passwd *pass = getpwuid(getuid());
1145         char buf[sizeof(long) * 8 + 1];
1146
1147         unsetenv("COLUMNS");
1148         unsetenv("LINES");
1149         unsetenv("TERMCAP");
1150
1151         if(pass) {
1152                 setenv("LOGNAME", pass->pw_name, 1);
1153                 setenv("USER", pass->pw_name, 1);
1154                 setenv("SHELL", pass->pw_shell, 0);
1155                 setenv("HOME", pass->pw_dir, 0);
1156         }
1157
1158         snprintf(buf, sizeof(buf), "%lu", xw.win);
1159         setenv("WINDOWID", buf, 1);
1160
1161         signal(SIGCHLD, SIG_DFL);
1162         signal(SIGHUP, SIG_DFL);
1163         signal(SIGINT, SIG_DFL);
1164         signal(SIGQUIT, SIG_DFL);
1165         signal(SIGTERM, SIG_DFL);
1166         signal(SIGALRM, SIG_DFL);
1167
1168         DEFAULT(envshell, shell);
1169         setenv("TERM", termname, 1);
1170         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1171         execvp(args[0], args);
1172         exit(EXIT_FAILURE);
1173 }
1174
1175 void
1176 sigchld(int a) {
1177         int stat, ret;
1178
1179         if(waitpid(pid, &stat, 0) < 0)
1180                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1181
1182         ret = WIFEXITED(stat) ? WEXITSTATUS(stat) : EXIT_FAILURE;
1183         if (ret != EXIT_SUCCESS)
1184                 die("child finished with error '%d'\n", stat);
1185         exit(EXIT_SUCCESS);
1186 }
1187
1188 void
1189 ttynew(void) {
1190         int m, s;
1191         struct winsize w = {term.row, term.col, 0, 0};
1192
1193         /* seems to work fine on linux, openbsd and freebsd */
1194         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1195                 die("openpty failed: %s\n", strerror(errno));
1196
1197         switch(pid = fork()) {
1198         case -1:
1199                 die("fork failed\n");
1200                 break;
1201         case 0:
1202                 setsid(); /* create a new process group */
1203                 dup2(s, STDIN_FILENO);
1204                 dup2(s, STDOUT_FILENO);
1205                 dup2(s, STDERR_FILENO);
1206                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1207                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1208                 close(s);
1209                 close(m);
1210                 execsh();
1211                 break;
1212         default:
1213                 close(s);
1214                 cmdfd = m;
1215                 signal(SIGCHLD, sigchld);
1216                 if(opt_io) {
1217                         term.mode |= MODE_PRINT;
1218                         iofd = (!strcmp(opt_io, "-")) ?
1219                                   STDOUT_FILENO :
1220                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1221                         if(iofd < 0) {
1222                                 fprintf(stderr, "Error opening %s:%s\n",
1223                                         opt_io, strerror(errno));
1224                         }
1225                 }
1226                 break;
1227         }
1228 }
1229
1230 void
1231 ttyread(void) {
1232         static char buf[BUFSIZ];
1233         static int buflen = 0;
1234         char *ptr;
1235         char s[UTF_SIZ];
1236         int charsize; /* size of utf8 char in bytes */
1237         long unicodep;
1238         int ret;
1239
1240         /* append read bytes to unprocessed bytes */
1241         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1242                 die("Couldn't read from shell: %s\n", strerror(errno));
1243
1244         /* process every complete utf8 char */
1245         buflen += ret;
1246         ptr = buf;
1247         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1248                 utf8encode(unicodep, s, UTF_SIZ);
1249                 tputc(s, charsize);
1250                 ptr += charsize;
1251                 buflen -= charsize;
1252         }
1253
1254         /* keep any uncomplete utf8 char for the next call */
1255         memmove(buf, ptr, buflen);
1256 }
1257
1258 void
1259 ttywrite(const char *s, size_t n) {
1260         if(xwrite(cmdfd, s, n) == -1)
1261                 die("write error on tty: %s\n", strerror(errno));
1262 }
1263
1264 void
1265 ttysend(char *s, size_t n) {
1266         ttywrite(s, n);
1267         if(IS_SET(MODE_ECHO))
1268                 techo(s, n);
1269 }
1270
1271 void
1272 ttyresize(void) {
1273         struct winsize w;
1274
1275         w.ws_row = term.row;
1276         w.ws_col = term.col;
1277         w.ws_xpixel = xw.tw;
1278         w.ws_ypixel = xw.th;
1279         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1280                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1281 }
1282
1283 int
1284 tattrset(int attr) {
1285         int i, j;
1286
1287         for(i = 0; i < term.row-1; i++) {
1288                 for(j = 0; j < term.col-1; j++) {
1289                         if(term.line[i][j].mode & attr)
1290                                 return 1;
1291                 }
1292         }
1293
1294         return 0;
1295 }
1296
1297 void
1298 tsetdirt(int top, int bot) {
1299         int i;
1300
1301         LIMIT(top, 0, term.row-1);
1302         LIMIT(bot, 0, term.row-1);
1303
1304         for(i = top; i <= bot; i++)
1305                 term.dirty[i] = 1;
1306 }
1307
1308 void
1309 tsetdirtattr(int attr) {
1310         int i, j;
1311
1312         for(i = 0; i < term.row-1; i++) {
1313                 for(j = 0; j < term.col-1; j++) {
1314                         if(term.line[i][j].mode & attr) {
1315                                 tsetdirt(i, i);
1316                                 break;
1317                         }
1318                 }
1319         }
1320 }
1321
1322 void
1323 tfulldirt(void) {
1324         tsetdirt(0, term.row-1);
1325 }
1326
1327 void
1328 tcursor(int mode) {
1329         static TCursor c[2];
1330         bool alt = IS_SET(MODE_ALTSCREEN);
1331
1332         if(mode == CURSOR_SAVE) {
1333                 c[alt] = term.c;
1334         } else if(mode == CURSOR_LOAD) {
1335                 term.c = c[alt];
1336                 tmoveto(c[alt].x, c[alt].y);
1337         }
1338 }
1339
1340 void
1341 treset(void) {
1342         uint i;
1343
1344         term.c = (TCursor){{
1345                 .mode = ATTR_NULL,
1346                 .fg = defaultfg,
1347                 .bg = defaultbg
1348         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1349
1350         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1351         for(i = tabspaces; i < term.col; i += tabspaces)
1352                 term.tabs[i] = 1;
1353         term.top = 0;
1354         term.bot = term.row - 1;
1355         term.mode = MODE_WRAP;
1356         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1357         term.charset = 0;
1358
1359         for(i = 0; i < 2; i++) {
1360                 tmoveto(0, 0);
1361                 tcursor(CURSOR_SAVE);
1362                 tclearregion(0, 0, term.col-1, term.row-1);
1363                 tswapscreen();
1364         }
1365 }
1366
1367 void
1368 tnew(int col, int row) {
1369         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1370         tresize(col, row);
1371         term.numlock = 1;
1372
1373         treset();
1374 }
1375
1376 void
1377 tswapscreen(void) {
1378         Line *tmp = term.line;
1379
1380         term.line = term.alt;
1381         term.alt = tmp;
1382         term.mode ^= MODE_ALTSCREEN;
1383         tfulldirt();
1384 }
1385
1386 void
1387 tscrolldown(int orig, int n) {
1388         int i;
1389         Line temp;
1390
1391         LIMIT(n, 0, term.bot-orig+1);
1392
1393         tsetdirt(orig, term.bot-n);
1394         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1395
1396         for(i = term.bot; i >= orig+n; i--) {
1397                 temp = term.line[i];
1398                 term.line[i] = term.line[i-n];
1399                 term.line[i-n] = temp;
1400         }
1401
1402         selscroll(orig, n);
1403 }
1404
1405 void
1406 tscrollup(int orig, int n) {
1407         int i;
1408         Line temp;
1409
1410         LIMIT(n, 0, term.bot-orig+1);
1411
1412         tclearregion(0, orig, term.col-1, orig+n-1);
1413         tsetdirt(orig+n, term.bot);
1414
1415         for(i = orig; i <= term.bot-n; i++) {
1416                 temp = term.line[i];
1417                 term.line[i] = term.line[i+n];
1418                 term.line[i+n] = temp;
1419         }
1420
1421         selscroll(orig, -n);
1422 }
1423
1424 void
1425 selscroll(int orig, int n) {
1426         if(sel.ob.x == -1)
1427                 return;
1428
1429         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1430                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1431                         selclear(NULL);
1432                         return;
1433                 }
1434                 if(sel.type == SEL_RECTANGULAR) {
1435                         if(sel.ob.y < term.top)
1436                                 sel.ob.y = term.top;
1437                         if(sel.oe.y > term.bot)
1438                                 sel.oe.y = term.bot;
1439                 } else {
1440                         if(sel.ob.y < term.top) {
1441                                 sel.ob.y = term.top;
1442                                 sel.ob.x = 0;
1443                         }
1444                         if(sel.oe.y > term.bot) {
1445                                 sel.oe.y = term.bot;
1446                                 sel.oe.x = term.col;
1447                         }
1448                 }
1449                 selnormalize();
1450         }
1451 }
1452
1453 void
1454 tnewline(int first_col) {
1455         int y = term.c.y;
1456
1457         if(y == term.bot) {
1458                 tscrollup(term.top, 1);
1459         } else {
1460                 y++;
1461         }
1462         tmoveto(first_col ? 0 : term.c.x, y);
1463 }
1464
1465 void
1466 csiparse(void) {
1467         char *p = csiescseq.buf, *np;
1468         long int v;
1469
1470         csiescseq.narg = 0;
1471         if(*p == '?') {
1472                 csiescseq.priv = 1;
1473                 p++;
1474         }
1475
1476         csiescseq.buf[csiescseq.len] = '\0';
1477         while(p < csiescseq.buf+csiescseq.len) {
1478                 np = NULL;
1479                 v = strtol(p, &np, 10);
1480                 if(np == p)
1481                         v = 0;
1482                 if(v == LONG_MAX || v == LONG_MIN)
1483                         v = -1;
1484                 csiescseq.arg[csiescseq.narg++] = v;
1485                 p = np;
1486                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1487                         break;
1488                 p++;
1489         }
1490         csiescseq.mode = *p;
1491 }
1492
1493 /* for absolute user moves, when decom is set */
1494 void
1495 tmoveato(int x, int y) {
1496         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1497 }
1498
1499 void
1500 tmoveto(int x, int y) {
1501         int miny, maxy;
1502
1503         if(term.c.state & CURSOR_ORIGIN) {
1504                 miny = term.top;
1505                 maxy = term.bot;
1506         } else {
1507                 miny = 0;
1508                 maxy = term.row - 1;
1509         }
1510         LIMIT(x, 0, term.col-1);
1511         LIMIT(y, miny, maxy);
1512         term.c.state &= ~CURSOR_WRAPNEXT;
1513         term.c.x = x;
1514         term.c.y = y;
1515 }
1516
1517 void
1518 tsetchar(char *c, Glyph *attr, int x, int y) {
1519         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1520                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1521                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1522                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1523                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1524                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1525                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1526                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1527                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1528         };
1529
1530         /*
1531          * The table is proudly stolen from rxvt.
1532          */
1533         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1534                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1535                         c = vt100_0[c[0] - 0x41];
1536                 }
1537         }
1538
1539         if(term.line[y][x].mode & ATTR_WIDE) {
1540                 if(x+1 < term.col) {
1541                         term.line[y][x+1].c[0] = ' ';
1542                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1543                 }
1544         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1545                 term.line[y][x-1].c[0] = ' ';
1546                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1547         }
1548
1549         term.dirty[y] = 1;
1550         term.line[y][x] = *attr;
1551         memcpy(term.line[y][x].c, c, UTF_SIZ);
1552 }
1553
1554 void
1555 tclearregion(int x1, int y1, int x2, int y2) {
1556         int x, y, temp;
1557         Glyph *gp;
1558
1559         if(x1 > x2)
1560                 temp = x1, x1 = x2, x2 = temp;
1561         if(y1 > y2)
1562                 temp = y1, y1 = y2, y2 = temp;
1563
1564         LIMIT(x1, 0, term.col-1);
1565         LIMIT(x2, 0, term.col-1);
1566         LIMIT(y1, 0, term.row-1);
1567         LIMIT(y2, 0, term.row-1);
1568
1569         for(y = y1; y <= y2; y++) {
1570                 term.dirty[y] = 1;
1571                 for(x = x1; x <= x2; x++) {
1572                         gp = &term.line[y][x];
1573                         if(selected(x, y))
1574                                 selclear(NULL);
1575                         gp->fg = term.c.attr.fg;
1576                         gp->bg = term.c.attr.bg;
1577                         gp->mode = 0;
1578                         memcpy(gp->c, " ", 2);
1579                 }
1580         }
1581 }
1582
1583 void
1584 tdeletechar(int n) {
1585         int dst, src, size;
1586         Glyph *line;
1587
1588         LIMIT(n, 0, term.col - term.c.x);
1589
1590         dst = term.c.x;
1591         src = term.c.x + n;
1592         size = term.col - src;
1593         line = term.line[term.c.y];
1594
1595         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1596         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1597 }
1598
1599 void
1600 tinsertblank(int n) {
1601         int dst, src, size;
1602         Glyph *line;
1603
1604         LIMIT(n, 0, term.col - term.c.x);
1605
1606         dst = term.c.x + n;
1607         src = term.c.x;
1608         size = term.col - dst;
1609         line = term.line[term.c.y];
1610
1611         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1612         tclearregion(src, term.c.y, dst - 1, term.c.y);
1613 }
1614
1615 void
1616 tinsertblankline(int n) {
1617         if(BETWEEN(term.c.y, term.top, term.bot))
1618                 tscrolldown(term.c.y, n);
1619 }
1620
1621 void
1622 tdeleteline(int n) {
1623         if(BETWEEN(term.c.y, term.top, term.bot))
1624                 tscrollup(term.c.y, n);
1625 }
1626
1627 int32_t
1628 tdefcolor(int *attr, int *npar, int l) {
1629         int32_t idx = -1;
1630         uint r, g, b;
1631
1632         switch (attr[*npar + 1]) {
1633         case 2: /* direct color in RGB space */
1634                 if (*npar + 4 >= l) {
1635                         fprintf(stderr,
1636                                 "erresc(38): Incorrect number of parameters (%d)\n",
1637                                 *npar);
1638                         break;
1639                 }
1640                 r = attr[*npar + 2];
1641                 g = attr[*npar + 3];
1642                 b = attr[*npar + 4];
1643                 *npar += 4;
1644                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1645                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1646                                 r, g, b);
1647                 else
1648                         idx = TRUECOLOR(r, g, b);
1649                 break;
1650         case 5: /* indexed color */
1651                 if (*npar + 2 >= l) {
1652                         fprintf(stderr,
1653                                 "erresc(38): Incorrect number of parameters (%d)\n",
1654                                 *npar);
1655                         break;
1656                 }
1657                 *npar += 2;
1658                 if(!BETWEEN(attr[*npar], 0, 255))
1659                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1660                 else
1661                         idx = attr[*npar];
1662                 break;
1663         case 0: /* implemented defined (only foreground) */
1664         case 1: /* transparent */
1665         case 3: /* direct color in CMY space */
1666         case 4: /* direct color in CMYK space */
1667         default:
1668                 fprintf(stderr,
1669                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1670                 break;
1671         }
1672
1673         return idx;
1674 }
1675
1676 void
1677 tsetattr(int *attr, int l) {
1678         int i;
1679         int32_t idx;
1680
1681         for(i = 0; i < l; i++) {
1682                 switch(attr[i]) {
1683                 case 0:
1684                         term.c.attr.mode &= ~(
1685                                 ATTR_BOLD       |
1686                                 ATTR_FAINT      |
1687                                 ATTR_ITALIC     |
1688                                 ATTR_UNDERLINE  |
1689                                 ATTR_BLINK      |
1690                                 ATTR_REVERSE    |
1691                                 ATTR_INVISIBLE  |
1692                                 ATTR_STRUCK     );
1693                         term.c.attr.fg = defaultfg;
1694                         term.c.attr.bg = defaultbg;
1695                         break;
1696                 case 1:
1697                         term.c.attr.mode |= ATTR_BOLD;
1698                         break;
1699                 case 2:
1700                         term.c.attr.mode |= ATTR_FAINT;
1701                         break;
1702                 case 3:
1703                         term.c.attr.mode |= ATTR_ITALIC;
1704                         break;
1705                 case 4:
1706                         term.c.attr.mode |= ATTR_UNDERLINE;
1707                         break;
1708                 case 5: /* slow blink */
1709                         /* FALLTHROUGH */
1710                 case 6: /* rapid blink */
1711                         term.c.attr.mode |= ATTR_BLINK;
1712                         break;
1713                 case 7:
1714                         term.c.attr.mode |= ATTR_REVERSE;
1715                         break;
1716                 case 8:
1717                         term.c.attr.mode |= ATTR_INVISIBLE;
1718                         break;
1719                 case 9:
1720                         term.c.attr.mode |= ATTR_STRUCK;
1721                         break;
1722                 case 22:
1723                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1724                         break;
1725                 case 23:
1726                         term.c.attr.mode &= ~ATTR_ITALIC;
1727                         break;
1728                 case 24:
1729                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1730                         break;
1731                 case 25:
1732                         term.c.attr.mode &= ~ATTR_BLINK;
1733                         break;
1734                 case 27:
1735                         term.c.attr.mode &= ~ATTR_REVERSE;
1736                         break;
1737                 case 28:
1738                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1739                         break;
1740                 case 29:
1741                         term.c.attr.mode &= ~ATTR_STRUCK;
1742                         break;
1743                 case 38:
1744                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1745                                 term.c.attr.fg = idx;
1746                         break;
1747                 case 39:
1748                         term.c.attr.fg = defaultfg;
1749                         break;
1750                 case 48:
1751                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1752                                 term.c.attr.bg = idx;
1753                         break;
1754                 case 49:
1755                         term.c.attr.bg = defaultbg;
1756                         break;
1757                 default:
1758                         if(BETWEEN(attr[i], 30, 37)) {
1759                                 term.c.attr.fg = attr[i] - 30;
1760                         } else if(BETWEEN(attr[i], 40, 47)) {
1761                                 term.c.attr.bg = attr[i] - 40;
1762                         } else if(BETWEEN(attr[i], 90, 97)) {
1763                                 term.c.attr.fg = attr[i] - 90 + 8;
1764                         } else if(BETWEEN(attr[i], 100, 107)) {
1765                                 term.c.attr.bg = attr[i] - 100 + 8;
1766                         } else {
1767                                 fprintf(stderr,
1768                                         "erresc(default): gfx attr %d unknown\n",
1769                                         attr[i]), csidump();
1770                         }
1771                         break;
1772                 }
1773         }
1774 }
1775
1776 void
1777 tsetscroll(int t, int b) {
1778         int temp;
1779
1780         LIMIT(t, 0, term.row-1);
1781         LIMIT(b, 0, term.row-1);
1782         if(t > b) {
1783                 temp = t;
1784                 t = b;
1785                 b = temp;
1786         }
1787         term.top = t;
1788         term.bot = b;
1789 }
1790
1791 void
1792 tsetmode(bool priv, bool set, int *args, int narg) {
1793         int *lim, mode;
1794         bool alt;
1795
1796         for(lim = args + narg; args < lim; ++args) {
1797                 if(priv) {
1798                         switch(*args) {
1799                         case 1: /* DECCKM -- Cursor key */
1800                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1801                                 break;
1802                         case 5: /* DECSCNM -- Reverse video */
1803                                 mode = term.mode;
1804                                 MODBIT(term.mode, set, MODE_REVERSE);
1805                                 if(mode != term.mode)
1806                                         redraw(REDRAW_TIMEOUT);
1807                                 break;
1808                         case 6: /* DECOM -- Origin */
1809                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1810                                 tmoveato(0, 0);
1811                                 break;
1812                         case 7: /* DECAWM -- Auto wrap */
1813                                 MODBIT(term.mode, set, MODE_WRAP);
1814                                 break;
1815                         case 0:  /* Error (IGNORED) */
1816                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1817                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1818                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1819                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1820                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1821                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1822                         case 42: /* DECNRCM -- National characters (IGNORED) */
1823                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1824                                 break;
1825                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1826                                 MODBIT(term.mode, !set, MODE_HIDE);
1827                                 break;
1828                         case 9:    /* X10 mouse compatibility mode */
1829                                 xsetpointermotion(0);
1830                                 MODBIT(term.mode, 0, MODE_MOUSE);
1831                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1832                                 break;
1833                         case 1000: /* 1000: report button press */
1834                                 xsetpointermotion(0);
1835                                 MODBIT(term.mode, 0, MODE_MOUSE);
1836                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1837                                 break;
1838                         case 1002: /* 1002: report motion on button press */
1839                                 xsetpointermotion(0);
1840                                 MODBIT(term.mode, 0, MODE_MOUSE);
1841                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1842                                 break;
1843                         case 1003: /* 1003: enable all mouse motions */
1844                                 xsetpointermotion(set);
1845                                 MODBIT(term.mode, 0, MODE_MOUSE);
1846                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1847                                 break;
1848                         case 1004: /* 1004: send focus events to tty */
1849                                 MODBIT(term.mode, set, MODE_FOCUS);
1850                                 break;
1851                         case 1006: /* 1006: extended reporting mode */
1852                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1853                                 break;
1854                         case 1034:
1855                                 MODBIT(term.mode, set, MODE_8BIT);
1856                                 break;
1857                         case 1049: /* swap screen & set/restore cursor as xterm */
1858                                 if (!allowaltscreen)
1859                                         break;
1860                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1861                                 /* FALLTHROUGH */
1862                         case 47: /* swap screen */
1863                         case 1047:
1864                                 if (!allowaltscreen)
1865                                         break;
1866                                 alt = IS_SET(MODE_ALTSCREEN);
1867                                 if(alt) {
1868                                         tclearregion(0, 0, term.col-1,
1869                                                         term.row-1);
1870                                 }
1871                                 if(set ^ alt) /* set is always 1 or 0 */
1872                                         tswapscreen();
1873                                 if(*args != 1049)
1874                                         break;
1875                                 /* FALLTHROUGH */
1876                         case 1048:
1877                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1878                                 break;
1879                         case 2004: /* 2004: bracketed paste mode */
1880                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1881                                 break;
1882                         /* Not implemented mouse modes. See comments there. */
1883                         case 1001: /* mouse highlight mode; can hang the
1884                                       terminal by design when implemented. */
1885                         case 1005: /* UTF-8 mouse mode; will confuse
1886                                       applications not supporting UTF-8
1887                                       and luit. */
1888                         case 1015: /* urxvt mangled mouse mode; incompatible
1889                                       and can be mistaken for other control
1890                                       codes. */
1891                         default:
1892                                 fprintf(stderr,
1893                                         "erresc: unknown private set/reset mode %d\n",
1894                                         *args);
1895                                 break;
1896                         }
1897                 } else {
1898                         switch(*args) {
1899                         case 0:  /* Error (IGNORED) */
1900                                 break;
1901                         case 2:  /* KAM -- keyboard action */
1902                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1903                                 break;
1904                         case 4:  /* IRM -- Insertion-replacement */
1905                                 MODBIT(term.mode, set, MODE_INSERT);
1906                                 break;
1907                         case 12: /* SRM -- Send/Receive */
1908                                 MODBIT(term.mode, !set, MODE_ECHO);
1909                                 break;
1910                         case 20: /* LNM -- Linefeed/new line */
1911                                 MODBIT(term.mode, set, MODE_CRLF);
1912                                 break;
1913                         default:
1914                                 fprintf(stderr,
1915                                         "erresc: unknown set/reset mode %d\n",
1916                                         *args);
1917                                 break;
1918                         }
1919                 }
1920         }
1921 }
1922
1923 void
1924 csihandle(void) {
1925         char buf[40];
1926         int len;
1927
1928         switch(csiescseq.mode) {
1929         default:
1930         unknown:
1931                 fprintf(stderr, "erresc: unknown csi ");
1932                 csidump();
1933                 /* die(""); */
1934                 break;
1935         case '@': /* ICH -- Insert <n> blank char */
1936                 DEFAULT(csiescseq.arg[0], 1);
1937                 tinsertblank(csiescseq.arg[0]);
1938                 break;
1939         case 'A': /* CUU -- Cursor <n> Up */
1940                 DEFAULT(csiescseq.arg[0], 1);
1941                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1942                 break;
1943         case 'B': /* CUD -- Cursor <n> Down */
1944         case 'e': /* VPR --Cursor <n> Down */
1945                 DEFAULT(csiescseq.arg[0], 1);
1946                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1947                 break;
1948         case 'i': /* MC -- Media Copy */
1949                 switch(csiescseq.arg[0]) {
1950                 case 0:
1951                         tdump();
1952                         break;
1953                 case 1:
1954                         tdumpline(term.c.y);
1955                         break;
1956                 case 2:
1957                         tdumpsel();
1958                         break;
1959                 case 4:
1960                         term.mode &= ~MODE_PRINT;
1961                         break;
1962                 case 5:
1963                         term.mode |= MODE_PRINT;
1964                         break;
1965                 }
1966                 break;
1967         case 'c': /* DA -- Device Attributes */
1968                 if(csiescseq.arg[0] == 0)
1969                         ttywrite(vtiden, sizeof(vtiden) - 1);
1970                 break;
1971         case 'C': /* CUF -- Cursor <n> Forward */
1972         case 'a': /* HPR -- Cursor <n> Forward */
1973                 DEFAULT(csiescseq.arg[0], 1);
1974                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1975                 break;
1976         case 'D': /* CUB -- Cursor <n> Backward */
1977                 DEFAULT(csiescseq.arg[0], 1);
1978                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1979                 break;
1980         case 'E': /* CNL -- Cursor <n> Down and first col */
1981                 DEFAULT(csiescseq.arg[0], 1);
1982                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1983                 break;
1984         case 'F': /* CPL -- Cursor <n> Up and first col */
1985                 DEFAULT(csiescseq.arg[0], 1);
1986                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1987                 break;
1988         case 'g': /* TBC -- Tabulation clear */
1989                 switch(csiescseq.arg[0]) {
1990                 case 0: /* clear current tab stop */
1991                         term.tabs[term.c.x] = 0;
1992                         break;
1993                 case 3: /* clear all the tabs */
1994                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1995                         break;
1996                 default:
1997                         goto unknown;
1998                 }
1999                 break;
2000         case 'G': /* CHA -- Move to <col> */
2001         case '`': /* HPA */
2002                 DEFAULT(csiescseq.arg[0], 1);
2003                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2004                 break;
2005         case 'H': /* CUP -- Move to <row> <col> */
2006         case 'f': /* HVP */
2007                 DEFAULT(csiescseq.arg[0], 1);
2008                 DEFAULT(csiescseq.arg[1], 1);
2009                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2010                 break;
2011         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2012                 DEFAULT(csiescseq.arg[0], 1);
2013                 tputtab(csiescseq.arg[0]);
2014                 break;
2015         case 'J': /* ED -- Clear screen */
2016                 selclear(NULL);
2017                 switch(csiescseq.arg[0]) {
2018                 case 0: /* below */
2019                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2020                         if(term.c.y < term.row-1) {
2021                                 tclearregion(0, term.c.y+1, term.col-1,
2022                                                 term.row-1);
2023                         }
2024                         break;
2025                 case 1: /* above */
2026                         if(term.c.y > 1)
2027                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2028                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2029                         break;
2030                 case 2: /* all */
2031                         tclearregion(0, 0, term.col-1, term.row-1);
2032                         break;
2033                 default:
2034                         goto unknown;
2035                 }
2036                 break;
2037         case 'K': /* EL -- Clear line */
2038                 switch(csiescseq.arg[0]) {
2039                 case 0: /* right */
2040                         tclearregion(term.c.x, term.c.y, term.col-1,
2041                                         term.c.y);
2042                         break;
2043                 case 1: /* left */
2044                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2045                         break;
2046                 case 2: /* all */
2047                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2048                         break;
2049                 }
2050                 break;
2051         case 'S': /* SU -- Scroll <n> line up */
2052                 DEFAULT(csiescseq.arg[0], 1);
2053                 tscrollup(term.top, csiescseq.arg[0]);
2054                 break;
2055         case 'T': /* SD -- Scroll <n> line down */
2056                 DEFAULT(csiescseq.arg[0], 1);
2057                 tscrolldown(term.top, csiescseq.arg[0]);
2058                 break;
2059         case 'L': /* IL -- Insert <n> blank lines */
2060                 DEFAULT(csiescseq.arg[0], 1);
2061                 tinsertblankline(csiescseq.arg[0]);
2062                 break;
2063         case 'l': /* RM -- Reset Mode */
2064                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2065                 break;
2066         case 'M': /* DL -- Delete <n> lines */
2067                 DEFAULT(csiescseq.arg[0], 1);
2068                 tdeleteline(csiescseq.arg[0]);
2069                 break;
2070         case 'X': /* ECH -- Erase <n> char */
2071                 DEFAULT(csiescseq.arg[0], 1);
2072                 tclearregion(term.c.x, term.c.y,
2073                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2074                 break;
2075         case 'P': /* DCH -- Delete <n> char */
2076                 DEFAULT(csiescseq.arg[0], 1);
2077                 tdeletechar(csiescseq.arg[0]);
2078                 break;
2079         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2080                 DEFAULT(csiescseq.arg[0], 1);
2081                 tputtab(-csiescseq.arg[0]);
2082                 break;
2083         case 'd': /* VPA -- Move to <row> */
2084                 DEFAULT(csiescseq.arg[0], 1);
2085                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2086                 break;
2087         case 'h': /* SM -- Set terminal mode */
2088                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2089                 break;
2090         case 'm': /* SGR -- Terminal attribute (color) */
2091                 tsetattr(csiescseq.arg, csiescseq.narg);
2092                 break;
2093         case 'n': /* DSR – Device Status Report (cursor position) */
2094                 if (csiescseq.arg[0] == 6) {
2095                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2096                                         term.c.y+1, term.c.x+1);
2097                         ttywrite(buf, len);
2098                 }
2099                 break;
2100         case 'r': /* DECSTBM -- Set Scrolling Region */
2101                 if(csiescseq.priv) {
2102                         goto unknown;
2103                 } else {
2104                         DEFAULT(csiescseq.arg[0], 1);
2105                         DEFAULT(csiescseq.arg[1], term.row);
2106                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2107                         tmoveato(0, 0);
2108                 }
2109                 break;
2110         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2111                 tcursor(CURSOR_SAVE);
2112                 break;
2113         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2114                 tcursor(CURSOR_LOAD);
2115                 break;
2116         }
2117 }
2118
2119 void
2120 csidump(void) {
2121         int i;
2122         uint c;
2123
2124         printf("ESC[");
2125         for(i = 0; i < csiescseq.len; i++) {
2126                 c = csiescseq.buf[i] & 0xff;
2127                 if(isprint(c)) {
2128                         putchar(c);
2129                 } else if(c == '\n') {
2130                         printf("(\\n)");
2131                 } else if(c == '\r') {
2132                         printf("(\\r)");
2133                 } else if(c == 0x1b) {
2134                         printf("(\\e)");
2135                 } else {
2136                         printf("(%02x)", c);
2137                 }
2138         }
2139         putchar('\n');
2140 }
2141
2142 void
2143 csireset(void) {
2144         memset(&csiescseq, 0, sizeof(csiescseq));
2145 }
2146
2147 void
2148 strhandle(void) {
2149         char *p = NULL;
2150         int j, narg, par;
2151
2152         term.esc &= ~(ESC_STR_END|ESC_STR);
2153         strparse();
2154         narg = strescseq.narg;
2155         par = atoi(strescseq.args[0]);
2156
2157         switch(strescseq.type) {
2158         case ']': /* OSC -- Operating System Command */
2159                 switch(par) {
2160                 case 0:
2161                 case 1:
2162                 case 2:
2163                         if(narg > 1)
2164                                 xsettitle(strescseq.args[1]);
2165                         return;
2166                 case 4: /* color set */
2167                         if(narg < 3)
2168                                 break;
2169                         p = strescseq.args[2];
2170                         /* FALLTHROUGH */
2171                 case 104: /* color reset, here p = NULL */
2172                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2173                         if(xsetcolorname(j, p)) {
2174                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2175                         } else {
2176                                 /*
2177                                  * TODO if defaultbg color is changed, borders
2178                                  * are dirty
2179                                  */
2180                                 redraw(0);
2181                         }
2182                         return;
2183                 }
2184                 break;
2185         case 'k': /* old title set compatibility */
2186                 xsettitle(strescseq.args[0]);
2187                 return;
2188         case 'P': /* DCS -- Device Control String */
2189         case '_': /* APC -- Application Program Command */
2190         case '^': /* PM -- Privacy Message */
2191                 return;
2192         }
2193
2194         fprintf(stderr, "erresc: unknown str ");
2195         strdump();
2196 }
2197
2198 void
2199 strparse(void) {
2200         char *p = strescseq.buf;
2201
2202         strescseq.narg = 0;
2203         strescseq.buf[strescseq.len] = '\0';
2204         while(p && strescseq.narg < STR_ARG_SIZ)
2205                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2206 }
2207
2208 void
2209 strdump(void) {
2210         int i;
2211         uint c;
2212
2213         printf("ESC%c", strescseq.type);
2214         for(i = 0; i < strescseq.len; i++) {
2215                 c = strescseq.buf[i] & 0xff;
2216                 if(c == '\0') {
2217                         return;
2218                 } else if(isprint(c)) {
2219                         putchar(c);
2220                 } else if(c == '\n') {
2221                         printf("(\\n)");
2222                 } else if(c == '\r') {
2223                         printf("(\\r)");
2224                 } else if(c == 0x1b) {
2225                         printf("(\\e)");
2226                 } else {
2227                         printf("(%02x)", c);
2228                 }
2229         }
2230         printf("ESC\\\n");
2231 }
2232
2233 void
2234 strreset(void) {
2235         memset(&strescseq, 0, sizeof(strescseq));
2236 }
2237
2238 void
2239 tprinter(char *s, size_t len) {
2240         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2241                 fprintf(stderr, "Error writing in %s:%s\n",
2242                         opt_io, strerror(errno));
2243                 close(iofd);
2244                 iofd = -1;
2245         }
2246 }
2247
2248 void
2249 toggleprinter(const Arg *arg) {
2250         term.mode ^= MODE_PRINT;
2251 }
2252
2253 void
2254 printscreen(const Arg *arg) {
2255         tdump();
2256 }
2257
2258 void
2259 printsel(const Arg *arg) {
2260         tdumpsel();
2261 }
2262
2263 void
2264 tdumpsel(void) {
2265         char *ptr;
2266
2267         if((ptr = getsel())) {
2268                 tprinter(ptr, strlen(ptr));
2269                 free(ptr);
2270         }
2271 }
2272
2273 void
2274 tdumpline(int n) {
2275         Glyph *bp, *end;
2276
2277         bp = &term.line[n][0];
2278         end = &bp[MIN(tlinelen(n), term.col) - 1];
2279         if(bp != end || bp->c[0] != ' ') {
2280                 for( ;bp <= end; ++bp)
2281                         tprinter(bp->c, utf8len(bp->c));
2282         }
2283         tprinter("\n", 1);
2284 }
2285
2286 void
2287 tdump(void) {
2288         int i;
2289
2290         for(i = 0; i < term.row; ++i)
2291                 tdumpline(i);
2292 }
2293
2294 void
2295 tputtab(int n) {
2296         uint x = term.c.x;
2297
2298         if(n > 0) {
2299                 while(x < term.col && n--)
2300                         for(++x; x < term.col && !term.tabs[x]; ++x)
2301                                 /* nothing */ ;
2302         } else if(n < 0) {
2303                 while(x > 0 && n++)
2304                         for(--x; x > 0 && !term.tabs[x]; --x)
2305                                 /* nothing */ ;
2306         }
2307         tmoveto(x, term.c.y);
2308 }
2309
2310 void
2311 techo(char *buf, int len) {
2312         for(; len > 0; buf++, len--) {
2313                 char c = *buf;
2314
2315                 if(ISCONTROL((uchar) c)) { /* control code */
2316                         if(c & 0x80) {
2317                                 c &= 0x7f;
2318                                 tputc("^", 1);
2319                                 tputc("[", 1);
2320                         } else if(c != '\n' && c != '\r' && c != '\t') {
2321                                 c ^= 0x40;
2322                                 tputc("^", 1);
2323                         }
2324                         tputc(&c, 1);
2325                 } else {
2326                         break;
2327                 }
2328         }
2329         if(len)
2330                 tputc(buf, len);
2331 }
2332
2333 void
2334 tdeftran(char ascii) {
2335         static char cs[] = "0B";
2336         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2337         char *p;
2338
2339         if((p = strchr(cs, ascii)) == NULL) {
2340                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2341         } else {
2342                 term.trantbl[term.icharset] = vcs[p - cs];
2343         }
2344 }
2345
2346 void
2347 tstrsequence(uchar c) {
2348         if (c & 0x80) {
2349                 switch (c) {
2350                 case 0x90:   /* DCS -- Device Control String */
2351                         c = 'P';
2352                         break;
2353                 case 0x9f:   /* APC -- Application Program Command */
2354                         c = '_';
2355                         break;
2356                 case 0x9e:   /* PM -- Privacy Message */
2357                         c = '^';
2358                         break;
2359                 case 0x9d:   /* OSC -- Operating System Command */
2360                         c = ']';
2361                         break;
2362                 }
2363         }
2364         strreset();
2365         strescseq.type = c;
2366         term.esc |= ESC_STR;
2367         return;
2368 }
2369
2370 void
2371 tcontrolcode(uchar ascii) {
2372         static char question[UTF_SIZ] = "?";
2373
2374         switch(ascii) {
2375         case '\t':   /* HT */
2376                 tputtab(1);
2377                 return;
2378         case '\b':   /* BS */
2379                 tmoveto(term.c.x-1, term.c.y);
2380                 return;
2381         case '\r':   /* CR */
2382                 tmoveto(0, term.c.y);
2383                 return;
2384         case '\f':   /* LF */
2385         case '\v':   /* VT */
2386         case '\n':   /* LF */
2387                 /* go to first col if the mode is set */
2388                 tnewline(IS_SET(MODE_CRLF));
2389                 return;
2390         case '\a':   /* BEL */
2391                 if(term.esc & ESC_STR_END) {
2392                         /* backwards compatibility to xterm */
2393                         strhandle();
2394                 } else {
2395                         if(!(xw.state & WIN_FOCUSED))
2396                                 xseturgency(1);
2397                         if (bellvolume)
2398                                 XBell(xw.dpy, bellvolume);
2399                 }
2400                 break;
2401         case '\033': /* ESC */
2402                 csireset();
2403                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2404                 term.esc |= ESC_START;
2405                 return;
2406         case '\016': /* SO */
2407                 term.charset = 0;
2408                 return;
2409         case '\017': /* SI */
2410                 term.charset = 1;
2411                 return;
2412         case '\032': /* SUB */
2413                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2414         case '\030': /* CAN */
2415                 csireset();
2416                 break;
2417         case '\005': /* ENQ (IGNORED) */
2418         case '\000': /* NUL (IGNORED) */
2419         case '\021': /* XON (IGNORED) */
2420         case '\023': /* XOFF (IGNORED) */
2421         case 0177:   /* DEL (IGNORED) */
2422                 return;
2423         case 0x84:   /* TODO: IND */
2424                 break;
2425         case 0x85:   /* NEL -- Next line */
2426                 tnewline(1); /* always go to first col */
2427                 break;
2428         case 0x88:   /* HTS -- Horizontal tab stop */
2429                 term.tabs[term.c.x] = 1;
2430                 break;
2431         case 0x8d:   /* TODO: RI */
2432         case 0x8e:   /* TODO: SS2 */
2433         case 0x8f:   /* TODO: SS3 */
2434         case 0x98:   /* TODO: SOS */
2435                 break;
2436         case 0x9a:   /* DECID -- Identify Terminal */
2437                 ttywrite(vtiden, sizeof(vtiden) - 1);
2438                 break;
2439         case 0x9b:   /* TODO: CSI */
2440         case 0x9c:   /* TODO: ST */
2441                 break;
2442         case 0x90:   /* DCS -- Device Control String */
2443         case 0x9f:   /* APC -- Application Program Command */
2444         case 0x9e:   /* PM -- Privacy Message */
2445         case 0x9d:   /* OSC -- Operating System Command */
2446                 tstrsequence(ascii);
2447                 return;
2448         }
2449         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2450         term.esc &= ~(ESC_STR_END|ESC_STR);
2451         return;
2452 }
2453
2454 void
2455 tdectest(char c) {
2456         static char E[UTF_SIZ] = "E";
2457         int x, y;
2458
2459         if(c == '8') { /* DEC screen alignment test. */
2460                 for(x = 0; x < term.col; ++x) {
2461                         for(y = 0; y < term.row; ++y)
2462                                 tsetchar(E, &term.c.attr, x, y);
2463                 }
2464         }
2465 }
2466
2467 void
2468 tputc(char *c, int len) {
2469         uchar ascii;
2470         bool control;
2471         long unicodep;
2472         int width;
2473         Glyph *gp;
2474
2475         if(len == 1) {
2476                 width = 1;
2477                 unicodep = ascii = *c;
2478         } else {
2479                 utf8decode(c, &unicodep, UTF_SIZ);
2480                 width = wcwidth(unicodep);
2481                 control = ISCONTROLC1(unicodep);
2482                 ascii = unicodep;
2483         }
2484
2485         if(IS_SET(MODE_PRINT))
2486                 tprinter(c, len);
2487         control = ISCONTROL(unicodep);
2488
2489         /*
2490          * STR sequence must be checked before anything else
2491          * because it uses all following characters until it
2492          * receives a ESC, a SUB, a ST or any other C1 control
2493          * character.
2494          */
2495         if(term.esc & ESC_STR) {
2496                 if(width == 1 &&
2497                    (ascii == '\a' || ascii == 030 ||
2498                     ascii == 032  || ascii == 033 ||
2499                     ISCONTROLC1(unicodep))) {
2500                         term.esc &= ~(ESC_START|ESC_STR);
2501                         term.esc |= ESC_STR_END;
2502                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2503                         memmove(&strescseq.buf[strescseq.len], c, len);
2504                         strescseq.len += len;
2505                         return;
2506                 } else {
2507                 /*
2508                  * Here is a bug in terminals. If the user never sends
2509                  * some code to stop the str or esc command, then st
2510                  * will stop responding. But this is better than
2511                  * silently failing with unknown characters. At least
2512                  * then users will report back.
2513                  *
2514                  * In the case users ever get fixed, here is the code:
2515                  */
2516                 /*
2517                  * term.esc = 0;
2518                  * strhandle();
2519                  */
2520                         return;
2521                 }
2522         }
2523
2524         /*
2525          * Actions of control codes must be performed as soon they arrive
2526          * because they can be embedded inside a control sequence, and
2527          * they must not cause conflicts with sequences.
2528          */
2529         if(control) {
2530                 tcontrolcode(ascii);
2531                 /*
2532                  * control codes are not shown ever
2533                  */
2534                 return;
2535         } else if(term.esc & ESC_START) {
2536                 if(term.esc & ESC_CSI) {
2537                         csiescseq.buf[csiescseq.len++] = ascii;
2538                         if(BETWEEN(ascii, 0x40, 0x7E)
2539                                         || csiescseq.len >= \
2540                                         sizeof(csiescseq.buf)-1) {
2541                                 term.esc = 0;
2542                                 csiparse();
2543                                 csihandle();
2544                         }
2545                         return;
2546                 } else if(term.esc & ESC_ALTCHARSET) {
2547                         tdeftran(ascii);
2548                 } else if(term.esc & ESC_TEST) {
2549                         tdectest(ascii);
2550                 } else {
2551                         switch(ascii) {
2552                         case '[':
2553                                 term.esc |= ESC_CSI;
2554                                 return;
2555                         case '#':
2556                                 term.esc |= ESC_TEST;
2557                                 return;
2558                         case 'P': /* DCS -- Device Control String */
2559                         case '_': /* APC -- Application Program Command */
2560                         case '^': /* PM -- Privacy Message */
2561                         case ']': /* OSC -- Operating System Command */
2562                         case 'k': /* old title set compatibility */
2563                                 tstrsequence(ascii);
2564                                 return;
2565                         case '(': /* set primary charset G0 */
2566                         case ')': /* set secondary charset G1 */
2567                         case '*': /* set tertiary charset G2 */
2568                         case '+': /* set quaternary charset G3 */
2569                                 term.icharset = ascii - '(';
2570                                 term.esc |= ESC_ALTCHARSET;
2571                                 return;
2572                         case 'D': /* IND -- Linefeed */
2573                                 if(term.c.y == term.bot) {
2574                                         tscrollup(term.top, 1);
2575                                 } else {
2576                                         tmoveto(term.c.x, term.c.y+1);
2577                                 }
2578                                 break;
2579                         case 'E': /* NEL -- Next line */
2580                                 tnewline(1); /* always go to first col */
2581                                 break;
2582                         case 'H': /* HTS -- Horizontal tab stop */
2583                                 term.tabs[term.c.x] = 1;
2584                                 break;
2585                         case 'M': /* RI -- Reverse index */
2586                                 if(term.c.y == term.top) {
2587                                         tscrolldown(term.top, 1);
2588                                 } else {
2589                                         tmoveto(term.c.x, term.c.y-1);
2590                                 }
2591                                 break;
2592                         case 'Z': /* DECID -- Identify Terminal */
2593                                 ttywrite(vtiden, sizeof(vtiden) - 1);
2594                                 break;
2595                         case 'c': /* RIS -- Reset to inital state */
2596                                 treset();
2597                                 xresettitle();
2598                                 xloadcols();
2599                                 break;
2600                         case '=': /* DECPAM -- Application keypad */
2601                                 term.mode |= MODE_APPKEYPAD;
2602                                 break;
2603                         case '>': /* DECPNM -- Normal keypad */
2604                                 term.mode &= ~MODE_APPKEYPAD;
2605                                 break;
2606                         case '7': /* DECSC -- Save Cursor */
2607                                 tcursor(CURSOR_SAVE);
2608                                 break;
2609                         case '8': /* DECRC -- Restore Cursor */
2610                                 tcursor(CURSOR_LOAD);
2611                                 break;
2612                         case '\\': /* ST -- String Terminator */
2613                                 if(term.esc & ESC_STR_END)
2614                                         strhandle();
2615                                 break;
2616                         default:
2617                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2618                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2619                                 break;
2620                         }
2621                 }
2622                 term.esc = 0;
2623                 /*
2624                  * All characters which form part of a sequence are not
2625                  * printed
2626                  */
2627                 return;
2628         }
2629         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2630                 selclear(NULL);
2631
2632         gp = &term.line[term.c.y][term.c.x];
2633         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2634                 gp->mode |= ATTR_WRAP;
2635                 tnewline(1);
2636         }
2637
2638         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2639                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2640
2641         if(term.c.x+width > term.col)
2642                 tnewline(1);
2643
2644         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2645
2646         if(width == 2) {
2647                 gp->mode |= ATTR_WIDE;
2648                 if(term.c.x+1 < term.col) {
2649                         gp[1].c[0] = '\0';
2650                         gp[1].mode = ATTR_WDUMMY;
2651                 }
2652         }
2653         if(term.c.x+width < term.col) {
2654                 tmoveto(term.c.x+width, term.c.y);
2655         } else {
2656                 term.c.state |= CURSOR_WRAPNEXT;
2657         }
2658 }
2659
2660 void
2661 tresize(int col, int row) {
2662         int i;
2663         int minrow = MIN(row, term.row);
2664         int mincol = MIN(col, term.col);
2665         int slide = term.c.y - row + 1;
2666         bool *bp;
2667         TCursor c;
2668
2669         if(col < 1 || row < 1) {
2670                 fprintf(stderr,
2671                         "tresize: error resizing to %dx%d\n", col, row);
2672                 return;
2673         }
2674
2675         /* free unneeded rows */
2676         i = 0;
2677         if(slide > 0) {
2678                 /*
2679                  * slide screen to keep cursor where we expect it -
2680                  * tscrollup would work here, but we can optimize to
2681                  * memmove because we're freeing the earlier lines
2682                  */
2683                 for(/* i = 0 */; i < slide; i++) {
2684                         free(term.line[i]);
2685                         free(term.alt[i]);
2686                 }
2687                 memmove(term.line, term.line + slide, row * sizeof(Line));
2688                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2689         }
2690         for(i += row; i < term.row; i++) {
2691                 free(term.line[i]);
2692                 free(term.alt[i]);
2693         }
2694
2695         /* resize to new height */
2696         term.line = xrealloc(term.line, row * sizeof(Line));
2697         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2698         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2699         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2700
2701         /* resize each row to new width, zero-pad if needed */
2702         for(i = 0; i < minrow; i++) {
2703                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2704                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2705         }
2706
2707         /* allocate any new rows */
2708         for(/* i == minrow */; i < row; i++) {
2709                 term.line[i] = xmalloc(col * sizeof(Glyph));
2710                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2711         }
2712         if(col > term.col) {
2713                 bp = term.tabs + term.col;
2714
2715                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2716                 while(--bp > term.tabs && !*bp)
2717                         /* nothing */ ;
2718                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2719                         *bp = 1;
2720         }
2721         /* update terminal size */
2722         term.col = col;
2723         term.row = row;
2724         /* reset scrolling region */
2725         tsetscroll(0, row-1);
2726         /* make use of the LIMIT in tmoveto */
2727         tmoveto(term.c.x, term.c.y);
2728         /* Clearing both screens (it makes dirty all lines) */
2729         c = term.c;
2730         for(i = 0; i < 2; i++) {
2731                 if(mincol < col && 0 < minrow) {
2732                         tclearregion(mincol, 0, col - 1, minrow - 1);
2733                 }
2734                 if(0 < col && minrow < row) {
2735                         tclearregion(0, minrow, col - 1, row - 1);
2736                 }
2737                 tswapscreen();
2738                 tcursor(CURSOR_LOAD);
2739         }
2740         term.c = c;
2741 }
2742
2743 void
2744 xresize(int col, int row) {
2745         xw.tw = MAX(1, col * xw.cw);
2746         xw.th = MAX(1, row * xw.ch);
2747
2748         XFreePixmap(xw.dpy, xw.buf);
2749         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2750                         DefaultDepth(xw.dpy, xw.scr));
2751         XftDrawChange(xw.draw, xw.buf);
2752         xclear(0, 0, xw.w, xw.h);
2753 }
2754
2755 static inline ushort
2756 sixd_to_16bit(int x) {
2757         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2758 }
2759
2760 void
2761 xloadcols(void) {
2762         int i;
2763         XRenderColor color = { .alpha = 0xffff };
2764         static bool loaded;
2765         Color *cp;
2766
2767         if(loaded) {
2768                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2769                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2770         }
2771
2772         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2773         for(i = 0; i < LEN(colorname); i++) {
2774                 if(!colorname[i])
2775                         continue;
2776                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2777                         die("Could not allocate color '%s'\n", colorname[i]);
2778                 }
2779         }
2780
2781         /* load colors [16-231] ; same colors as xterm */
2782         for(i = 16; i < 6*6*6+16; i++) {
2783                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2784                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2785                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2786                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2787                         die("Could not allocate color %d\n", i);
2788         }
2789
2790         /* load colors [232-255] ; grayscale */
2791         for(; i < 256; i++) {
2792                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2793                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2794                         die("Could not allocate color %d\n", i);
2795         }
2796         loaded = true;
2797 }
2798
2799 int
2800 xsetcolorname(int x, const char *name) {
2801         XRenderColor color = { .alpha = 0xffff };
2802         Color ncolor;
2803
2804         if(!BETWEEN(x, 0, LEN(colorname)))
2805                 return 1;
2806
2807         if(!name) {
2808                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2809                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2810                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2811                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2812                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2813                                                 xw.cmap, &color, &ncolor)) {
2814                                 return 1;
2815                         }
2816
2817                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2818                         dc.col[x] = ncolor;
2819                         return 0;
2820                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2821                         color.red = color.green = color.blue = \
2822                                     0x0808 + 0x0a0a * (x - (16 + 216));
2823                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2824                                                 xw.cmap, &color, &ncolor)) {
2825                                 return 1;
2826                         }
2827
2828                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2829                         dc.col[x] = ncolor;
2830                         return 0;
2831                 } else { /* system colors */
2832                         name = colorname[x];
2833                 }
2834         }
2835         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2836                 return 1;
2837
2838         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2839         dc.col[x] = ncolor;
2840         return 0;
2841 }
2842
2843 void
2844 xtermclear(int col1, int row1, int col2, int row2) {
2845         XftDrawRect(xw.draw,
2846                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2847                         borderpx + col1 * xw.cw,
2848                         borderpx + row1 * xw.ch,
2849                         (col2-col1+1) * xw.cw,
2850                         (row2-row1+1) * xw.ch);
2851 }
2852
2853 /*
2854  * Absolute coordinates.
2855  */
2856 void
2857 xclear(int x1, int y1, int x2, int y2) {
2858         XftDrawRect(xw.draw,
2859                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2860                         x1, y1, x2-x1, y2-y1);
2861 }
2862
2863 void
2864 xhints(void) {
2865         XClassHint class = {opt_class ? opt_class : termname, termname};
2866         XWMHints wm = {.flags = InputHint, .input = 1};
2867         XSizeHints *sizeh = NULL;
2868
2869         sizeh = XAllocSizeHints();
2870
2871         sizeh->flags = PSize | PResizeInc | PBaseSize;
2872         sizeh->height = xw.h;
2873         sizeh->width = xw.w;
2874         sizeh->height_inc = xw.ch;
2875         sizeh->width_inc = xw.cw;
2876         sizeh->base_height = 2 * borderpx;
2877         sizeh->base_width = 2 * borderpx;
2878         if(xw.isfixed == True) {
2879                 sizeh->flags |= PMaxSize | PMinSize;
2880                 sizeh->min_width = sizeh->max_width = xw.w;
2881                 sizeh->min_height = sizeh->max_height = xw.h;
2882         }
2883         if(xw.gm & (XValue|YValue)) {
2884                 sizeh->flags |= USPosition | PWinGravity;
2885                 sizeh->x = xw.l;
2886                 sizeh->y = xw.t;
2887                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2888         }
2889
2890         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2891                         &class);
2892         XFree(sizeh);
2893 }
2894
2895 int
2896 xgeommasktogravity(int mask) {
2897         switch(mask & (XNegative|YNegative)) {
2898         case 0:
2899                 return NorthWestGravity;
2900         case XNegative:
2901                 return NorthEastGravity;
2902         case YNegative:
2903                 return SouthWestGravity;
2904         }
2905         return SouthEastGravity;
2906 }
2907
2908 int
2909 xloadfont(Font *f, FcPattern *pattern) {
2910         FcPattern *match;
2911         FcResult result;
2912
2913         match = FcFontMatch(NULL, pattern, &result);
2914         if(!match)
2915                 return 1;
2916
2917         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2918                 FcPatternDestroy(match);
2919                 return 1;
2920         }
2921
2922         f->set = NULL;
2923         f->pattern = FcPatternDuplicate(pattern);
2924
2925         f->ascent = f->match->ascent;
2926         f->descent = f->match->descent;
2927         f->lbearing = 0;
2928         f->rbearing = f->match->max_advance_width;
2929
2930         f->height = f->ascent + f->descent;
2931         f->width = f->lbearing + f->rbearing;
2932
2933         return 0;
2934 }
2935
2936 void
2937 xloadfonts(char *fontstr, double fontsize) {
2938         FcPattern *pattern;
2939         FcResult r_sz, r_psz;
2940         double fontval;
2941         float ceilf(float);
2942
2943         if(fontstr[0] == '-') {
2944                 pattern = XftXlfdParse(fontstr, False, False);
2945         } else {
2946                 pattern = FcNameParse((FcChar8 *)fontstr);
2947         }
2948
2949         if(!pattern)
2950                 die("st: can't open font %s\n", fontstr);
2951
2952         if(fontsize > 0) {
2953                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2954                 FcPatternDel(pattern, FC_SIZE);
2955                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2956                 usedfontsize = fontsize;
2957         } else {
2958                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2959                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2960                 if(r_psz == FcResultMatch) {
2961                         usedfontsize = fontval;
2962                 } else if(r_sz == FcResultMatch) {
2963                         usedfontsize = -1;
2964                 } else {
2965                         /*
2966                          * Default font size is 12, if none given. This is to
2967                          * have a known usedfontsize value.
2968                          */
2969                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2970                         usedfontsize = 12;
2971                 }
2972         }
2973
2974         FcConfigSubstitute(0, pattern, FcMatchPattern);
2975         FcDefaultSubstitute(pattern);
2976
2977         if(xloadfont(&dc.font, pattern))
2978                 die("st: can't open font %s\n", fontstr);
2979
2980         if(usedfontsize < 0) {
2981                 FcPatternGetDouble(dc.font.match->pattern,
2982                                    FC_PIXEL_SIZE, 0, &fontval);
2983                 usedfontsize = fontval;
2984         }
2985
2986         /* Setting character width and height. */
2987         xw.cw = ceilf(dc.font.width * cwscale);
2988         xw.ch = ceilf(dc.font.height * chscale);
2989
2990         FcPatternDel(pattern, FC_SLANT);
2991         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2992         if(xloadfont(&dc.ifont, pattern))
2993                 die("st: can't open font %s\n", fontstr);
2994
2995         FcPatternDel(pattern, FC_WEIGHT);
2996         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2997         if(xloadfont(&dc.ibfont, pattern))
2998                 die("st: can't open font %s\n", fontstr);
2999
3000         FcPatternDel(pattern, FC_SLANT);
3001         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3002         if(xloadfont(&dc.bfont, pattern))
3003                 die("st: can't open font %s\n", fontstr);
3004
3005         FcPatternDestroy(pattern);
3006 }
3007
3008 int
3009 xloadfontset(Font *f) {
3010         FcResult result;
3011
3012         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
3013                 return 1;
3014         return 0;
3015 }
3016
3017 void
3018 xunloadfont(Font *f) {
3019         XftFontClose(xw.dpy, f->match);
3020         FcPatternDestroy(f->pattern);
3021         if(f->set)
3022                 FcFontSetDestroy(f->set);
3023 }
3024
3025 void
3026 xunloadfonts(void) {
3027         /* Free the loaded fonts in the font cache.  */
3028         while(frclen > 0)
3029                 XftFontClose(xw.dpy, frc[--frclen].font);
3030
3031         xunloadfont(&dc.font);
3032         xunloadfont(&dc.bfont);
3033         xunloadfont(&dc.ifont);
3034         xunloadfont(&dc.ibfont);
3035 }
3036
3037 void
3038 xzoom(const Arg *arg) {
3039         xunloadfonts();
3040         xloadfonts(usedfont, usedfontsize + arg->i);
3041         cresize(0, 0);
3042         redraw(0);
3043         xhints();
3044 }
3045
3046 void
3047 xinit(void) {
3048         XGCValues gcvalues;
3049         Cursor cursor;
3050         Window parent;
3051         pid_t thispid = getpid();
3052
3053         if(!(xw.dpy = XOpenDisplay(NULL)))
3054                 die("Can't open display\n");
3055         xw.scr = XDefaultScreen(xw.dpy);
3056         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3057
3058         /* font */
3059         if(!FcInit())
3060                 die("Could not init fontconfig.\n");
3061
3062         usedfont = (opt_font == NULL)? font : opt_font;
3063         xloadfonts(usedfont, 0);
3064
3065         /* colors */
3066         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3067         xloadcols();
3068
3069         /* adjust fixed window geometry */
3070         xw.w = 2 * borderpx + term.col * xw.cw;
3071         xw.h = 2 * borderpx + term.row * xw.ch;
3072         if(xw.gm & XNegative)
3073                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3074         if(xw.gm & YNegative)
3075                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3076
3077         /* Events */
3078         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3079         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3080         xw.attrs.bit_gravity = NorthWestGravity;
3081         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3082                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3083                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3084         xw.attrs.colormap = xw.cmap;
3085
3086         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3087                         XRootWindow(xw.dpy, xw.scr);
3088         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3089                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3090                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3091                         | CWEventMask | CWColormap, &xw.attrs);
3092
3093         memset(&gcvalues, 0, sizeof(gcvalues));
3094         gcvalues.graphics_exposures = False;
3095         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3096                         &gcvalues);
3097         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3098                         DefaultDepth(xw.dpy, xw.scr));
3099         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3100         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3101
3102         /* Xft rendering context */
3103         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3104
3105         /* input methods */
3106         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3107                 XSetLocaleModifiers("@im=local");
3108                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3109                         XSetLocaleModifiers("@im=");
3110                         if((xw.xim = XOpenIM(xw.dpy,
3111                                         NULL, NULL, NULL)) == NULL) {
3112                                 die("XOpenIM failed. Could not open input"
3113                                         " device.\n");
3114                         }
3115                 }
3116         }
3117         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3118                                            | XIMStatusNothing, XNClientWindow, xw.win,
3119                                            XNFocusWindow, xw.win, NULL);
3120         if(xw.xic == NULL)
3121                 die("XCreateIC failed. Could not obtain input method.\n");
3122
3123         /* white cursor, black outline */
3124         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3125         XDefineCursor(xw.dpy, xw.win, cursor);
3126         XRecolorCursor(xw.dpy, cursor,
3127                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3128                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3129
3130         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3131         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3132         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3133         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3134
3135         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3136         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3137                         PropModeReplace, (uchar *)&thispid, 1);
3138
3139         xresettitle();
3140         XMapWindow(xw.dpy, xw.win);
3141         xhints();
3142         XSync(xw.dpy, False);
3143 }
3144
3145 void
3146 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3147         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3148             width = charlen * xw.cw, xp, i;
3149         int frcflags;
3150         int u8fl, u8fblen, u8cblen, doesexist;
3151         char *u8c, *u8fs;
3152         long unicodep;
3153         Font *font = &dc.font;
3154         FcResult fcres;
3155         FcPattern *fcpattern, *fontpattern;
3156         FcFontSet *fcsets[] = { NULL };
3157         FcCharSet *fccharset;
3158         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3159         XRenderColor colfg, colbg;
3160         XRectangle r;
3161         int oneatatime;
3162
3163         frcflags = FRC_NORMAL;
3164
3165         if(base.mode & ATTR_ITALIC) {
3166                 if(base.fg == defaultfg)
3167                         base.fg = defaultitalic;
3168                 font = &dc.ifont;
3169                 frcflags = FRC_ITALIC;
3170         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3171                 if(base.fg == defaultfg)
3172                         base.fg = defaultitalic;
3173                 font = &dc.ibfont;
3174                 frcflags = FRC_ITALICBOLD;
3175         } else if(base.mode & ATTR_UNDERLINE) {
3176                 if(base.fg == defaultfg)
3177                         base.fg = defaultunderline;
3178         }
3179
3180         if(IS_TRUECOL(base.fg)) {
3181                 colfg.alpha = 0xffff;
3182                 colfg.red = TRUERED(base.fg);
3183                 colfg.green = TRUEGREEN(base.fg);
3184                 colfg.blue = TRUEBLUE(base.fg);
3185                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3186                 fg = &truefg;
3187         } else {
3188                 fg = &dc.col[base.fg];
3189         }
3190
3191         if(IS_TRUECOL(base.bg)) {
3192                 colbg.alpha = 0xffff;
3193                 colbg.green = TRUEGREEN(base.bg);
3194                 colbg.red = TRUERED(base.bg);
3195                 colbg.blue = TRUEBLUE(base.bg);
3196                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3197                 bg = &truebg;
3198         } else {
3199                 bg = &dc.col[base.bg];
3200         }
3201
3202         if(base.mode & ATTR_BOLD) {
3203                 /*
3204                  * change basic system colors [0-7]
3205                  * to bright system colors [8-15]
3206                  */
3207                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3208                         fg = &dc.col[base.fg + 8];
3209
3210                 if(base.mode & ATTR_ITALIC) {
3211                         font = &dc.ibfont;
3212                         frcflags = FRC_ITALICBOLD;
3213                 } else {
3214                         font = &dc.bfont;
3215                         frcflags = FRC_BOLD;
3216                 }
3217         }
3218
3219         if(IS_SET(MODE_REVERSE)) {
3220                 if(fg == &dc.col[defaultfg]) {
3221                         fg = &dc.col[defaultbg];
3222                 } else {
3223                         colfg.red = ~fg->color.red;
3224                         colfg.green = ~fg->color.green;
3225                         colfg.blue = ~fg->color.blue;
3226                         colfg.alpha = fg->color.alpha;
3227                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3228                                         &revfg);
3229                         fg = &revfg;
3230                 }
3231
3232                 if(bg == &dc.col[defaultbg]) {
3233                         bg = &dc.col[defaultfg];
3234                 } else {
3235                         colbg.red = ~bg->color.red;
3236                         colbg.green = ~bg->color.green;
3237                         colbg.blue = ~bg->color.blue;
3238                         colbg.alpha = bg->color.alpha;
3239                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3240                                         &revbg);
3241                         bg = &revbg;
3242                 }
3243         }
3244
3245         if(base.mode & ATTR_REVERSE) {
3246                 temp = fg;
3247                 fg = bg;
3248                 bg = temp;
3249         }
3250
3251         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3252                 colfg.red = fg->color.red / 2;
3253                 colfg.green = fg->color.green / 2;
3254                 colfg.blue = fg->color.blue / 2;
3255                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3256                 fg = &revfg;
3257         }
3258
3259         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3260                 fg = bg;
3261
3262         if(base.mode & ATTR_INVISIBLE)
3263                 fg = bg;
3264
3265         /* Intelligent cleaning up of the borders. */
3266         if(x == 0) {
3267                 xclear(0, (y == 0)? 0 : winy, borderpx,
3268                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3269         }
3270         if(x + charlen >= term.col) {
3271                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3272                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3273         }
3274         if(y == 0)
3275                 xclear(winx, 0, winx + width, borderpx);
3276         if(y == term.row-1)
3277                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3278
3279         /* Clean up the region we want to draw to. */
3280         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3281
3282         /* Set the clip region because Xft is sometimes dirty. */
3283         r.x = 0;
3284         r.y = 0;
3285         r.height = xw.ch;
3286         r.width = width;
3287         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3288
3289         for(xp = winx; bytelen > 0;) {
3290                 /*
3291                  * Search for the range in the to be printed string of glyphs
3292                  * that are in the main font. Then print that range. If
3293                  * some glyph is found that is not in the font, do the
3294                  * fallback dance.
3295                  */
3296                 u8fs = s;
3297                 u8fblen = 0;
3298                 u8fl = 0;
3299                 oneatatime = font->width != xw.cw;
3300                 for(;;) {
3301                         u8c = s;
3302                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3303                         s += u8cblen;
3304                         bytelen -= u8cblen;
3305
3306                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3307                         if(doesexist) {
3308                                         u8fl++;
3309                                         u8fblen += u8cblen;
3310                                         if(!oneatatime && bytelen > 0)
3311                                                         continue;
3312                         }
3313
3314                         if(u8fl > 0) {
3315                                 XftDrawStringUtf8(xw.draw, fg,
3316                                                 font->match, xp,
3317                                                 winy + font->ascent,
3318                                                 (FcChar8 *)u8fs,
3319                                                 u8fblen);
3320                                 xp += xw.cw * u8fl;
3321                         }
3322                         break;
3323                 }
3324                 if(doesexist) {
3325                         if(oneatatime)
3326                                 continue;
3327                         break;
3328                 }
3329
3330                 /* Search the font cache. */
3331                 for(i = 0; i < frclen; i++) {
3332                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3333                                         && frc[i].flags == frcflags) {
3334                                 break;
3335                         }
3336                 }
3337
3338                 /* Nothing was found. */
3339                 if(i >= frclen) {
3340                         if(!font->set)
3341                                 xloadfontset(font);
3342                         fcsets[0] = font->set;
3343
3344                         /*
3345                          * Nothing was found in the cache. Now use
3346                          * some dozen of Fontconfig calls to get the
3347                          * font for one single character.
3348                          *
3349                          * Xft and fontconfig are design failures.
3350                          */
3351                         fcpattern = FcPatternDuplicate(font->pattern);
3352                         fccharset = FcCharSetCreate();
3353
3354                         FcCharSetAddChar(fccharset, unicodep);
3355                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3356                                         fccharset);
3357                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3358                                         FcTrue);
3359
3360                         FcConfigSubstitute(0, fcpattern,
3361                                         FcMatchPattern);
3362                         FcDefaultSubstitute(fcpattern);
3363
3364                         fontpattern = FcFontSetMatch(0, fcsets,
3365                                         FcTrue, fcpattern, &fcres);
3366
3367                         /*
3368                          * Overwrite or create the new cache entry.
3369                          */
3370                         if(frclen >= LEN(frc)) {
3371                                 frclen = LEN(frc) - 1;
3372                                 XftFontClose(xw.dpy, frc[frclen].font);
3373                         }
3374
3375                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3376                                         fontpattern);
3377                         frc[frclen].flags = frcflags;
3378
3379                         i = frclen;
3380                         frclen++;
3381
3382                         FcPatternDestroy(fcpattern);
3383                         FcCharSetDestroy(fccharset);
3384                 }
3385
3386                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3387                                 xp, winy + frc[i].font->ascent,
3388                                 (FcChar8 *)u8c, u8cblen);
3389
3390                 xp += xw.cw * wcwidth(unicodep);
3391         }
3392
3393         /*
3394          * This is how the loop above actually should be. Why does the
3395          * application have to care about font details?
3396          *
3397          * I have to repeat: Xft and Fontconfig are design failures.
3398          */
3399         /*
3400         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3401                         winy + font->ascent, (FcChar8 *)s, bytelen);
3402         */
3403
3404         if(base.mode & ATTR_UNDERLINE) {
3405                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3406                                 width, 1);
3407         }
3408
3409         if(base.mode & ATTR_STRUCK) {
3410                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3411                                 width, 1);
3412         }
3413
3414         /* Reset clip to none. */
3415         XftDrawSetClip(xw.draw, 0);
3416 }
3417
3418 void
3419 xdrawcursor(void) {
3420         static int oldx = 0, oldy = 0;
3421         int sl, width, curx;
3422         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3423
3424         LIMIT(oldx, 0, term.col-1);
3425         LIMIT(oldy, 0, term.row-1);
3426
3427         curx = term.c.x;
3428
3429         /* adjust position if in dummy */
3430         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3431                 oldx--;
3432         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3433                 curx--;
3434
3435         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3436
3437         /* remove the old cursor */
3438         sl = utf8len(term.line[oldy][oldx].c);
3439         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3440         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3441                         oldy, width, sl);
3442
3443         /* draw the new one */
3444         if(!(IS_SET(MODE_HIDE))) {
3445                 if(xw.state & WIN_FOCUSED) {
3446                         if(IS_SET(MODE_REVERSE)) {
3447                                 g.mode |= ATTR_REVERSE;
3448                                 g.fg = defaultcs;
3449                                 g.bg = defaultfg;
3450                         }
3451
3452                         sl = utf8len(g.c);
3453                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3454                                 ? 2 : 1;
3455                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3456                 } else {
3457                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3458                                         borderpx + curx * xw.cw,
3459                                         borderpx + term.c.y * xw.ch,
3460                                         xw.cw - 1, 1);
3461                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3462                                         borderpx + curx * xw.cw,
3463                                         borderpx + term.c.y * xw.ch,
3464                                         1, xw.ch - 1);
3465                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3466                                         borderpx + (curx + 1) * xw.cw - 1,
3467                                         borderpx + term.c.y * xw.ch,
3468                                         1, xw.ch - 1);
3469                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3470                                         borderpx + curx * xw.cw,
3471                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3472                                         xw.cw, 1);
3473                 }
3474                 oldx = curx, oldy = term.c.y;
3475         }
3476 }
3477
3478
3479 void
3480 xsettitle(char *p) {
3481         XTextProperty prop;
3482
3483         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3484                         &prop);
3485         XSetWMName(xw.dpy, xw.win, &prop);
3486         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3487         XFree(prop.value);
3488 }
3489
3490 void
3491 xresettitle(void) {
3492         xsettitle(opt_title ? opt_title : "st");
3493 }
3494
3495 void
3496 redraw(int timeout) {
3497         struct timespec tv = {0, timeout * 1000};
3498
3499         tfulldirt();
3500         draw();
3501
3502         if(timeout > 0) {
3503                 nanosleep(&tv, NULL);
3504                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3505         }
3506 }
3507
3508 void
3509 draw(void) {
3510         drawregion(0, 0, term.col, term.row);
3511         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3512                         xw.h, 0, 0);
3513         XSetForeground(xw.dpy, dc.gc,
3514                         dc.col[IS_SET(MODE_REVERSE)?
3515                                 defaultfg : defaultbg].pixel);
3516 }
3517
3518 void
3519 drawregion(int x1, int y1, int x2, int y2) {
3520         int ic, ib, x, y, ox, sl;
3521         Glyph base, new;
3522         char buf[DRAW_BUF_SIZ];
3523         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3524         long unicodep;
3525
3526         if(!(xw.state & WIN_VISIBLE))
3527                 return;
3528
3529         for(y = y1; y < y2; y++) {
3530                 if(!term.dirty[y])
3531                         continue;
3532
3533                 xtermclear(0, y, term.col, y);
3534                 term.dirty[y] = 0;
3535                 base = term.line[y][0];
3536                 ic = ib = ox = 0;
3537                 for(x = x1; x < x2; x++) {
3538                         new = term.line[y][x];
3539                         if(new.mode == ATTR_WDUMMY)
3540                                 continue;
3541                         if(ena_sel && selected(x, y))
3542                                 new.mode ^= ATTR_REVERSE;
3543                         if(ib > 0 && (ATTRCMP(base, new)
3544                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3545                                 xdraws(buf, base, ox, y, ic, ib);
3546                                 ic = ib = 0;
3547                         }
3548                         if(ib == 0) {
3549                                 ox = x;
3550                                 base = new;
3551                         }
3552
3553                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3554                         memcpy(buf+ib, new.c, sl);
3555                         ib += sl;
3556                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3557                 }
3558                 if(ib > 0)
3559                         xdraws(buf, base, ox, y, ic, ib);
3560         }
3561         xdrawcursor();
3562 }
3563
3564 void
3565 expose(XEvent *ev) {
3566         XExposeEvent *e = &ev->xexpose;
3567
3568         if(xw.state & WIN_REDRAW) {
3569                 if(!e->count)
3570                         xw.state &= ~WIN_REDRAW;
3571         }
3572         redraw(0);
3573 }
3574
3575 void
3576 visibility(XEvent *ev) {
3577         XVisibilityEvent *e = &ev->xvisibility;
3578
3579         if(e->state == VisibilityFullyObscured) {
3580                 xw.state &= ~WIN_VISIBLE;
3581         } else if(!(xw.state & WIN_VISIBLE)) {
3582                 /* need a full redraw for next Expose, not just a buf copy */
3583                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3584         }
3585 }
3586
3587 void
3588 unmap(XEvent *ev) {
3589         xw.state &= ~WIN_VISIBLE;
3590 }
3591
3592 void
3593 xsetpointermotion(int set) {
3594         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3595         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3596 }
3597
3598 void
3599 xseturgency(int add) {
3600         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3601
3602         MODBIT(h->flags, add, XUrgencyHint);
3603         XSetWMHints(xw.dpy, xw.win, h);
3604         XFree(h);
3605 }
3606
3607 void
3608 focus(XEvent *ev) {
3609         XFocusChangeEvent *e = &ev->xfocus;
3610
3611         if(e->mode == NotifyGrab)
3612                 return;
3613
3614         if(ev->type == FocusIn) {
3615                 XSetICFocus(xw.xic);
3616                 xw.state |= WIN_FOCUSED;
3617                 xseturgency(0);
3618                 if(IS_SET(MODE_FOCUS))
3619                         ttywrite("\033[I", 3);
3620         } else {
3621                 XUnsetICFocus(xw.xic);
3622                 xw.state &= ~WIN_FOCUSED;
3623                 if(IS_SET(MODE_FOCUS))
3624                         ttywrite("\033[O", 3);
3625         }
3626 }
3627
3628 static inline bool
3629 match(uint mask, uint state) {
3630         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3631 }
3632
3633 void
3634 numlock(const Arg *dummy) {
3635         term.numlock ^= 1;
3636 }
3637
3638 char*
3639 kmap(KeySym k, uint state) {
3640         Key *kp;
3641         int i;
3642
3643         /* Check for mapped keys out of X11 function keys. */
3644         for(i = 0; i < LEN(mappedkeys); i++) {
3645                 if(mappedkeys[i] == k)
3646                         break;
3647         }
3648         if(i == LEN(mappedkeys)) {
3649                 if((k & 0xFFFF) < 0xFD00)
3650                         return NULL;
3651         }
3652
3653         for(kp = key; kp < key + LEN(key); kp++) {
3654                 if(kp->k != k)
3655                         continue;
3656
3657                 if(!match(kp->mask, state))
3658                         continue;
3659
3660                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3661                         continue;
3662                 if(term.numlock && kp->appkey == 2)
3663                         continue;
3664
3665                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3666                         continue;
3667
3668                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3669                         continue;
3670
3671                 return kp->s;
3672         }
3673
3674         return NULL;
3675 }
3676
3677 void
3678 kpress(XEvent *ev) {
3679         XKeyEvent *e = &ev->xkey;
3680         KeySym ksym;
3681         char buf[32], *customkey;
3682         int len;
3683         long c;
3684         Status status;
3685         Shortcut *bp;
3686
3687         if(IS_SET(MODE_KBDLOCK))
3688                 return;
3689
3690         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3691         /* 1. shortcuts */
3692         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3693                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3694                         bp->func(&(bp->arg));
3695                         return;
3696                 }
3697         }
3698
3699         /* 2. custom keys from config.h */
3700         if((customkey = kmap(ksym, e->state))) {
3701                 ttysend(customkey, strlen(customkey));
3702                 return;
3703         }
3704
3705         /* 3. composed string from input method */
3706         if(len == 0)
3707                 return;
3708         if(len == 1 && e->state & Mod1Mask) {
3709                 if(IS_SET(MODE_8BIT)) {
3710                         if(*buf < 0177) {
3711                                 c = *buf | 0x80;
3712                                 len = utf8encode(c, buf, UTF_SIZ);
3713                         }
3714                 } else {
3715                         buf[1] = buf[0];
3716                         buf[0] = '\033';
3717                         len = 2;
3718                 }
3719         }
3720         ttysend(buf, len);
3721 }
3722
3723
3724 void
3725 cmessage(XEvent *e) {
3726         /*
3727          * See xembed specs
3728          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3729          */
3730         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3731                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3732                         xw.state |= WIN_FOCUSED;
3733                         xseturgency(0);
3734                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3735                         xw.state &= ~WIN_FOCUSED;
3736                 }
3737         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3738                 /* Send SIGHUP to shell */
3739                 kill(pid, SIGHUP);
3740                 exit(EXIT_SUCCESS);
3741         }
3742 }
3743
3744 void
3745 cresize(int width, int height) {
3746         int col, row;
3747
3748         if(width != 0)
3749                 xw.w = width;
3750         if(height != 0)
3751                 xw.h = height;
3752
3753         col = (xw.w - 2 * borderpx) / xw.cw;
3754         row = (xw.h - 2 * borderpx) / xw.ch;
3755
3756         tresize(col, row);
3757         xresize(col, row);
3758         ttyresize();
3759 }
3760
3761 void
3762 resize(XEvent *e) {
3763         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3764                 return;
3765
3766         cresize(e->xconfigure.width, e->xconfigure.height);
3767 }
3768
3769 void
3770 run(void) {
3771         XEvent ev;
3772         int w = xw.w, h = xw.h;
3773         fd_set rfd;
3774         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3775         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3776         long deltatime;
3777
3778         /* Waiting for window mapping */
3779         while(1) {
3780                 XNextEvent(xw.dpy, &ev);
3781                 if(XFilterEvent(&ev, None))
3782                         continue;
3783                 if(ev.type == ConfigureNotify) {
3784                         w = ev.xconfigure.width;
3785                         h = ev.xconfigure.height;
3786                 } else if(ev.type == MapNotify) {
3787                         break;
3788                 }
3789         }
3790
3791         ttynew();
3792         cresize(w, h);
3793
3794         clock_gettime(CLOCK_MONOTONIC, &last);
3795         lastblink = last;
3796
3797         for(xev = actionfps;;) {
3798                 FD_ZERO(&rfd);
3799                 FD_SET(cmdfd, &rfd);
3800                 FD_SET(xfd, &rfd);
3801
3802                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3803                         if(errno == EINTR)
3804                                 continue;
3805                         die("select failed: %s\n", strerror(errno));
3806                 }
3807                 if(FD_ISSET(cmdfd, &rfd)) {
3808                         ttyread();
3809                         if(blinktimeout) {
3810                                 blinkset = tattrset(ATTR_BLINK);
3811                                 if(!blinkset)
3812                                         MODBIT(term.mode, 0, MODE_BLINK);
3813                         }
3814                 }
3815
3816                 if(FD_ISSET(xfd, &rfd))
3817                         xev = actionfps;
3818
3819                 clock_gettime(CLOCK_MONOTONIC, &now);
3820                 drawtimeout.tv_sec = 0;
3821                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3822                 tv = &drawtimeout;
3823
3824                 dodraw = 0;
3825                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3826                         tsetdirtattr(ATTR_BLINK);
3827                         term.mode ^= MODE_BLINK;
3828                         lastblink = now;
3829                         dodraw = 1;
3830                 }
3831                 deltatime = TIMEDIFF(now, last);
3832                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3833                                 || deltatime < 0) {
3834                         dodraw = 1;
3835                         last = now;
3836                 }
3837
3838                 if(dodraw) {
3839                         while(XPending(xw.dpy)) {
3840                                 XNextEvent(xw.dpy, &ev);
3841                                 if(XFilterEvent(&ev, None))
3842                                         continue;
3843                                 if(handler[ev.type])
3844                                         (handler[ev.type])(&ev);
3845                         }
3846
3847                         draw();
3848                         XFlush(xw.dpy);
3849
3850                         if(xev && !FD_ISSET(xfd, &rfd))
3851                                 xev--;
3852                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3853                                 if(blinkset) {
3854                                         if(TIMEDIFF(now, lastblink) \
3855                                                         > blinktimeout) {
3856                                                 drawtimeout.tv_nsec = 1000;
3857                                         } else {
3858                                                 drawtimeout.tv_nsec = (1E6 * \
3859                                                         (blinktimeout - \
3860                                                         TIMEDIFF(now,
3861                                                                 lastblink)));
3862                                         }
3863                                 } else {
3864                                         tv = NULL;
3865                                 }
3866                         }
3867                 }
3868         }
3869 }
3870
3871 void
3872 usage(void) {
3873         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3874         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
3875         "          [-i] [-t title] [-w windowid] [-e command ...]\n", argv0);
3876 }
3877
3878 int
3879 main(int argc, char *argv[]) {
3880         char *titles;
3881         uint cols = 80, rows = 24;
3882
3883         xw.l = xw.t = 0;
3884         xw.isfixed = False;
3885
3886         ARGBEGIN {
3887         case 'a':
3888                 allowaltscreen = false;
3889                 break;
3890         case 'c':
3891                 opt_class = EARGF(usage());
3892                 break;
3893         case 'e':
3894                 /* eat all remaining arguments */
3895                 if(argc > 1) {
3896                         opt_cmd = &argv[1];
3897                         if(argv[1] != NULL && opt_title == NULL) {
3898                                 titles = xstrdup(argv[1]);
3899                                 opt_title = basename(titles);
3900                         }
3901                 }
3902                 goto run;
3903         case 'f':
3904                 opt_font = EARGF(usage());
3905                 break;
3906         case 'g':
3907                 xw.gm = XParseGeometry(EARGF(usage()),
3908                                 &xw.l, &xw.t, &cols, &rows);
3909                 break;
3910         case 'i':
3911                 xw.isfixed = True;
3912                 break;
3913         case 'o':
3914                 opt_io = EARGF(usage());
3915                 break;
3916         case 't':
3917                 opt_title = EARGF(usage());
3918                 break;
3919         case 'w':
3920                 opt_embed = EARGF(usage());
3921                 break;
3922         case 'v':
3923         default:
3924                 usage();
3925         } ARGEND;
3926
3927 run:
3928         setlocale(LC_CTYPE, "");
3929         XSetLocaleModifiers("");
3930         tnew(cols? cols : 1, rows? rows : 1);
3931         xinit();
3932         selinit();
3933         run();
3934
3935         return 0;
3936 }
3937