st.c

   1 /* See LICENSE for licence details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <stdint.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <libgen.h>
  24 #include <X11/Xatom.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <fontconfig/fontconfig.h>
  31 #include <wchar.h>
  32
  33 #include "arg.h"
  34
  35 char *argv0;
  36
  37 #define Glyph Glyph_
  38 #define Font Font_
  39
  40 #if   defined(__linux)
  41  #include <pty.h>
  42 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  43  #include <util.h>
  44 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  45  #include <libutil.h>
  46 #endif
  47
  48
  49 /* XEMBED messages */
  50 #define XEMBED_FOCUS_IN  4
  51 #define XEMBED_FOCUS_OUT 5
  52
  53 /* Arbitrary sizes */
  54 #define UTF_INVALID   0xFFFD
  55 #define UTF_SIZ       4
  56 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  57 #define ESC_ARG_SIZ   16
  58 #define STR_BUF_SIZ   ESC_BUF_SIZ
  59 #define STR_ARG_SIZ   ESC_ARG_SIZ
  60 #define DRAW_BUF_SIZ  20*1024
  61 #define XK_ANY_MOD    UINT_MAX
  62 #define XK_NO_MOD     0
  63 #define XK_SWITCH_MOD (1<<13)
  64
  65 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  66
  67 /* macros */
  68 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  69 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  70 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  71 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  72 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  73 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f))
  74 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  75 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  76 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  77 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  78 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  79 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_nsec-t2.tv_nsec)/1E6)
  80 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  81
  82 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  83 #define IS_TRUECOL(x)    (1 << 24 & (x))
  84 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  85 #define TRUEGREEN(x)     (((x) & 0xff00))
  86 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  87
  88
  89 #define VT102ID "\033[?6c"
  90
  91 enum glyph_attribute {
  92         ATTR_NULL      = 0,
  93         ATTR_BOLD      = 1,
  94         ATTR_FAINT     = 2,
  95         ATTR_ITALIC    = 4,
  96         ATTR_UNDERLINE = 8,
  97         ATTR_BLINK     = 16,
  98         ATTR_FASTBLINK = 32,
  99         ATTR_REVERSE   = 64,
 100         ATTR_INVISIBLE = 128,
 101         ATTR_STRUCK    = 256,
 102         ATTR_WRAP      = 512,
 103         ATTR_WIDE      = 1024,
 104         ATTR_WDUMMY    = 2048,
 105 };
 106
 107 enum cursor_movement {
 108         CURSOR_SAVE,
 109         CURSOR_LOAD
 110 };
 111
 112 enum cursor_state {
 113         CURSOR_DEFAULT  = 0,
 114         CURSOR_WRAPNEXT = 1,
 115         CURSOR_ORIGIN   = 2
 116 };
 117
 118 enum term_mode {
 119         MODE_WRAP        = 1,
 120         MODE_INSERT      = 2,
 121         MODE_APPKEYPAD   = 4,
 122         MODE_ALTSCREEN   = 8,
 123         MODE_CRLF        = 16,
 124         MODE_MOUSEBTN    = 32,
 125         MODE_MOUSEMOTION = 64,
 126         MODE_REVERSE     = 128,
 127         MODE_KBDLOCK     = 256,
 128         MODE_HIDE        = 512,
 129         MODE_ECHO        = 1024,
 130         MODE_APPCURSOR   = 2048,
 131         MODE_MOUSESGR    = 4096,
 132         MODE_8BIT        = 8192,
 133         MODE_BLINK       = 16384,
 134         MODE_FBLINK      = 32768,
 135         MODE_FOCUS       = 65536,
 136         MODE_MOUSEX10    = 131072,
 137         MODE_MOUSEMANY   = 262144,
 138         MODE_BRCKTPASTE  = 524288,
 139         MODE_PRINT       = 1048576,
 140         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 141                           |MODE_MOUSEMANY,
 142 };
 143
 144 enum charset {
 145         CS_GRAPHIC0,
 146         CS_GRAPHIC1,
 147         CS_UK,
 148         CS_USA,
 149         CS_MULTI,
 150         CS_GER,
 151         CS_FIN
 152 };
 153
 154 enum escape_state {
 155         ESC_START      = 1,
 156         ESC_CSI        = 2,
 157         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 158         ESC_ALTCHARSET = 8,
 159         ESC_STR_END    = 16, /* a final string was encountered */
 160         ESC_TEST       = 32, /* Enter in test mode */
 161 };
 162
 163 enum window_state {
 164         WIN_VISIBLE = 1,
 165         WIN_REDRAW  = 2,
 166         WIN_FOCUSED = 4
 167 };
 168
 169 enum selection_type {
 170         SEL_REGULAR = 1,
 171         SEL_RECTANGULAR = 2
 172 };
 173
 174 enum selection_snap {
 175         SNAP_WORD = 1,
 176         SNAP_LINE = 2
 177 };
 178
 179 typedef unsigned char uchar;
 180 typedef unsigned int uint;
 181 typedef unsigned long ulong;
 182 typedef unsigned short ushort;
 183
 184 typedef XftDraw *Draw;
 185 typedef XftColor Color;
 186
 187 typedef struct {
 188         char c[UTF_SIZ]; /* character code */
 189         ushort mode;      /* attribute flags */
 190         uint32_t fg;      /* foreground  */
 191         uint32_t bg;      /* background  */
 192 } Glyph;
 193
 194 typedef Glyph *Line;
 195
 196 typedef struct {
 197         Glyph attr; /* current char attributes */
 198         int x;
 199         int y;
 200         char state;
 201 } TCursor;
 202
 203 /* CSI Escape sequence structs */
 204 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 205 typedef struct {
 206         char buf[ESC_BUF_SIZ]; /* raw string */
 207         int len;               /* raw string length */
 208         char priv;
 209         int arg[ESC_ARG_SIZ];
 210         int narg;              /* nb of args */
 211         char mode;
 212 } CSIEscape;
 213
 214 /* STR Escape sequence structs */
 215 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 216 typedef struct {
 217         char type;             /* ESC type ... */
 218         char buf[STR_BUF_SIZ]; /* raw string */
 219         int len;               /* raw string length */
 220         char *args[STR_ARG_SIZ];
 221         int narg;              /* nb of args */
 222 } STREscape;
 223
 224 /* Internal representation of the screen */
 225 typedef struct {
 226         int row;      /* nb row */
 227         int col;      /* nb col */
 228         Line *line;   /* screen */
 229         Line *alt;    /* alternate screen */
 230         bool *dirty;  /* dirtyness of lines */
 231         TCursor c;    /* cursor */
 232         int top;      /* top    scroll limit */
 233         int bot;      /* bottom scroll limit */
 234         int mode;     /* terminal mode flags */
 235         int esc;      /* escape state flags */
 236         char trantbl[4]; /* charset table translation */
 237         int charset;  /* current charset */
 238         int icharset; /* selected charset for sequence */
 239         bool numlock; /* lock numbers in keyboard */
 240         bool *tabs;
 241 } Term;
 242
 243 /* Purely graphic info */
 244 typedef struct {
 245         Display *dpy;
 246         Colormap cmap;
 247         Window win;
 248         Drawable buf;
 249         Atom xembed, wmdeletewin, netwmname, netwmpid;
 250         XIM xim;
 251         XIC xic;
 252         Draw draw;
 253         Visual *vis;
 254         XSetWindowAttributes attrs;
 255         int scr;
 256         bool isfixed; /* is fixed geometry? */
 257         int l, t; /* left and top offset */
 258         int gm; /* geometry mask */
 259         int tw, th; /* tty width and height */
 260         int w, h; /* window width and height */
 261         int ch; /* char height */
 262         int cw; /* char width  */
 263         char state; /* focus, redraw, visible */
 264 } XWindow;
 265
 266 typedef struct {
 267         uint b;
 268         uint mask;
 269         char *s;
 270 } Mousekey;
 271
 272 typedef struct {
 273         KeySym k;
 274         uint mask;
 275         char *s;
 276         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 277         signed char appkey;    /* application keypad */
 278         signed char appcursor; /* application cursor */
 279         signed char crlf;      /* crlf mode          */
 280 } Key;
 281
 282 typedef struct {
 283         int mode;
 284         int type;
 285         int snap;
 286         /*
 287          * Selection variables:
 288          * nb – normalized coordinates of the beginning of the selection
 289          * ne – normalized coordinates of the end of the selection
 290          * ob – original coordinates of the beginning of the selection
 291          * oe – original coordinates of the end of the selection
 292          */
 293         struct {
 294                 int x, y;
 295         } nb, ne, ob, oe;
 296
 297         char *clip;
 298         Atom xtarget;
 299         bool alt;
 300         struct timespec tclick1;
 301         struct timespec tclick2;
 302 } Selection;
 303
 304 typedef union {
 305         int i;
 306         uint ui;
 307         float f;
 308         const void *v;
 309 } Arg;
 310
 311 typedef struct {
 312         uint mod;
 313         KeySym keysym;
 314         void (*func)(const Arg *);
 315         const Arg arg;
 316 } Shortcut;
 317
 318 /* function definitions used in config.h */
 319 static void clippaste(const Arg *);
 320 static void numlock(const Arg *);
 321 static void selpaste(const Arg *);
 322 static void xzoom(const Arg *);
 323 static void printsel(const Arg *);
 324 static void printscreen(const Arg *) ;
 325 static void toggleprinter(const Arg *);
 326
 327 /* Config.h for applying patches and the configuration. */
 328 #include "config.h"
 329
 330 /* Font structure */
 331 typedef struct {
 332         int height;
 333         int width;
 334         int ascent;
 335         int descent;
 336         short lbearing;
 337         short rbearing;
 338         XftFont *match;
 339         FcFontSet *set;
 340         FcPattern *pattern;
 341 } Font;
 342
 343 /* Drawing Context */
 344 typedef struct {
 345         Color col[MAX(LEN(colorname), 256)];
 346         Font font, bfont, ifont, ibfont;
 347         GC gc;
 348 } DC;
 349
 350 static void die(const char *, ...);
 351 static void draw(void);
 352 static void redraw(int);
 353 static void drawregion(int, int, int, int);
 354 static void execsh(void);
 355 static void sigchld(int);
 356 static void run(void);
 357
 358 static void csidump(void);
 359 static void csihandle(void);
 360 static void csiparse(void);
 361 static void csireset(void);
 362 static void strdump(void);
 363 static void strhandle(void);
 364 static void strparse(void);
 365 static void strreset(void);
 366
 367 static int tattrset(int);
 368 static void tprinter(char *, size_t);
 369 static void tdumpsel(void);
 370 static void tdumpline(int);
 371 static void tdump(void);
 372 static void tclearregion(int, int, int, int);
 373 static void tcursor(int);
 374 static void tdeletechar(int);
 375 static void tdeleteline(int);
 376 static void tinsertblank(int);
 377 static void tinsertblankline(int);
 378 static int tlinelen(int);
 379 static void tmoveto(int, int);
 380 static void tmoveato(int, int);
 381 static void tnew(int, int);
 382 static void tnewline(int);
 383 static void tputtab(int);
 384 static void tputc(char *, int);
 385 static void treset(void);
 386 static int tresize(int, int);
 387 static void tscrollup(int, int);
 388 static void tscrolldown(int, int);
 389 static void tsetattr(int *, int);
 390 static void tsetchar(char *, Glyph *, int, int);
 391 static void tsetscroll(int, int);
 392 static void tswapscreen(void);
 393 static void tsetdirt(int, int);
 394 static void tsetdirtattr(int);
 395 static void tsetmode(bool, bool, int *, int);
 396 static void tfulldirt(void);
 397 static void techo(char *, int);
 398 static void tcontrolcode(uchar );
 399 static void tdectest(char );
 400 static int32_t tdefcolor(int *, int *, int);
 401 static void tdeftran(char);
 402 static inline bool match(uint, uint);
 403 static void ttynew(void);
 404 static void ttyread(void);
 405 static void ttyresize(void);
 406 static void ttysend(char *, size_t);
 407 static void ttywrite(const char *, size_t);
 408 static void tstrsequence(uchar c);
 409
 410 static void xdraws(char *, Glyph, int, int, int, int);
 411 static void xhints(void);
 412 static void xclear(int, int, int, int);
 413 static void xdrawcursor(void);
 414 static void xinit(void);
 415 static void xloadcols(void);
 416 static int xsetcolorname(int, const char *);
 417 static int xgeommasktogravity(int);
 418 static int xloadfont(Font *, FcPattern *);
 419 static void xloadfonts(char *, double);
 420 static int xloadfontset(Font *);
 421 static void xsettitle(char *);
 422 static void xresettitle(void);
 423 static void xsetpointermotion(int);
 424 static void xseturgency(int);
 425 static void xsetsel(char *);
 426 static void xtermclear(int, int, int, int);
 427 static void xunloadfont(Font *);
 428 static void xunloadfonts(void);
 429 static void xresize(int, int);
 430
 431 static void expose(XEvent *);
 432 static void visibility(XEvent *);
 433 static void unmap(XEvent *);
 434 static char *kmap(KeySym, uint);
 435 static void kpress(XEvent *);
 436 static void cmessage(XEvent *);
 437 static void cresize(int, int);
 438 static void resize(XEvent *);
 439 static void focus(XEvent *);
 440 static void brelease(XEvent *);
 441 static void bpress(XEvent *);
 442 static void bmotion(XEvent *);
 443 static void selnotify(XEvent *);
 444 static void selclear(XEvent *);
 445 static void selrequest(XEvent *);
 446
 447 static void selinit(void);
 448 static void selnormalize(void);
 449 static inline bool selected(int, int);
 450 static char *getsel(void);
 451 static void selcopy(void);
 452 static void selscroll(int, int);
 453 static void selsnap(int, int *, int *, int);
 454 static void getbuttoninfo(XEvent *);
 455 static void mousereport(XEvent *);
 456
 457 static size_t utf8decode(char *, long *, size_t);
 458 static long utf8decodebyte(char, size_t *);
 459 static size_t utf8encode(long, char *, size_t);
 460 static char utf8encodebyte(long, size_t);
 461 static size_t utf8len(char *);
 462 static size_t utf8validate(long *, size_t);
 463
 464 static ssize_t xwrite(int, const char *, size_t);
 465 static void *xmalloc(size_t);
 466 static void *xrealloc(void *, size_t);
 467 static char *xstrdup(char *);
 468
 469 static void usage(void);
 470
 471 static void (*handler[LASTEvent])(XEvent *) = {
 472         [KeyPress] = kpress,
 473         [ClientMessage] = cmessage,
 474         [ConfigureNotify] = resize,
 475         [VisibilityNotify] = visibility,
 476         [UnmapNotify] = unmap,
 477         [Expose] = expose,
 478         [FocusIn] = focus,
 479         [FocusOut] = focus,
 480         [MotionNotify] = bmotion,
 481         [ButtonPress] = bpress,
 482         [ButtonRelease] = brelease,
 483         [SelectionClear] = selclear,
 484         [SelectionNotify] = selnotify,
 485         [SelectionRequest] = selrequest,
 486 };
 487
 488 /* Globals */
 489 static DC dc;
 490 static XWindow xw;
 491 static Term term;
 492 static CSIEscape csiescseq;
 493 static STREscape strescseq;
 494 static int cmdfd;
 495 static pid_t pid;
 496 static Selection sel;
 497 static int iofd = STDOUT_FILENO;
 498 static char **opt_cmd = NULL;
 499 static char *opt_io = NULL;
 500 static char *opt_title = NULL;
 501 static char *opt_embed = NULL;
 502 static char *opt_class = NULL;
 503 static char *opt_font = NULL;
 504 static int oldbutton = 3; /* button event on startup: 3 = release */
 505
 506 static char *usedfont = NULL;
 507 static double usedfontsize = 0;
 508
 509 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 510 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 511 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 512 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 513
 514 /* Font Ring Cache */
 515 enum {
 516         FRC_NORMAL,
 517         FRC_ITALIC,
 518         FRC_BOLD,
 519         FRC_ITALICBOLD
 520 };
 521
 522 typedef struct {
 523         XftFont *font;
 524         int flags;
 525 } Fontcache;
 526
 527 /* Fontcache is an array now. A new font will be appended to the array. */
 528 static Fontcache frc[16];
 529 static int frclen = 0;
 530
 531 ssize_t
 532 xwrite(int fd, const char *s, size_t len) {
 533         size_t aux = len;
 534
 535         while(len > 0) {
 536                 ssize_t r = write(fd, s, len);
 537                 if(r < 0)
 538                         return r;
 539                 len -= r;
 540                 s += r;
 541         }
 542         return aux;
 543 }
 544
 545 void *
 546 xmalloc(size_t len) {
 547         void *p = malloc(len);
 548
 549         if(!p)
 550                 die("Out of memory\n");
 551
 552         return p;
 553 }
 554
 555 void *
 556 xrealloc(void *p, size_t len) {
 557         if((p = realloc(p, len)) == NULL)
 558                 die("Out of memory\n");
 559
 560         return p;
 561 }
 562
 563 char *
 564 xstrdup(char *s) {
 565         if((s = strdup(s)) == NULL)
 566                 die("Out of memory\n");
 567
 568         return s;
 569 }
 570
 571 size_t
 572 utf8decode(char *c, long *u, size_t clen) {
 573         size_t i, j, len, type;
 574         long udecoded;
 575
 576         *u = UTF_INVALID;
 577         if(!clen)
 578                 return 0;
 579         udecoded = utf8decodebyte(c[0], &len);
 580         if(!BETWEEN(len, 1, UTF_SIZ))
 581                 return 1;
 582         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 583                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 584                 if(type != 0)
 585                         return j;
 586         }
 587         if(j < len)
 588                 return 0;
 589         *u = udecoded;
 590         utf8validate(u, len);
 591         return len;
 592 }
 593
 594 long
 595 utf8decodebyte(char c, size_t *i) {
 596         for(*i = 0; *i < LEN(utfmask); ++(*i))
 597                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 598                         return (uchar)c & ~utfmask[*i];
 599         return 0;
 600 }
 601
 602 size_t
 603 utf8encode(long u, char *c, size_t clen) {
 604         size_t len, i;
 605
 606         len = utf8validate(&u, 0);
 607         if(clen < len)
 608                 return 0;
 609         for(i = len - 1; i != 0; --i) {
 610                 c[i] = utf8encodebyte(u, 0);
 611                 u >>= 6;
 612         }
 613         c[0] = utf8encodebyte(u, len);
 614         return len;
 615 }
 616
 617 char
 618 utf8encodebyte(long u, size_t i) {
 619         return utfbyte[i] | (u & ~utfmask[i]);
 620 }
 621
 622 size_t
 623 utf8len(char *c) {
 624         return utf8decode(c, &(long){0}, UTF_SIZ);
 625 }
 626
 627 size_t
 628 utf8validate(long *u, size_t i) {
 629         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 630                 *u = UTF_INVALID;
 631         for(i = 1; *u > utfmax[i]; ++i)
 632                 ;
 633         return i;
 634 }
 635
 636 static void
 637 selinit(void) {
 638         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 639         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 640         sel.mode = 0;
 641         sel.ob.x = -1;
 642         sel.clip = NULL;
 643         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 644         if(sel.xtarget == None)
 645                 sel.xtarget = XA_STRING;
 646 }
 647
 648 static int
 649 x2col(int x) {
 650         x -= borderpx;
 651         x /= xw.cw;
 652
 653         return LIMIT(x, 0, term.col-1);
 654 }
 655
 656 static int
 657 y2row(int y) {
 658         y -= borderpx;
 659         y /= xw.ch;
 660
 661         return LIMIT(y, 0, term.row-1);
 662 }
 663
 664 static int tlinelen(int y) {
 665         int i = term.col;
 666
 667         while (i > 0 && term.line[y][i - 1].c[0] == ' ')
 668                 --i;
 669
 670         return i;
 671 }
 672
 673 static void
 674 selnormalize(void) {
 675         int i;
 676
 677         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
 678                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 679                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 680         } else {
 681                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 682                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 683         }
 684         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 685         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 686
 687         /* expand selection over line breaks */
 688         if (sel.type == SEL_RECTANGULAR)
 689                 return;
 690         i = tlinelen(sel.nb.y);
 691         if (i < sel.nb.x)
 692                 sel.nb.x = i;
 693         if (tlinelen(sel.ne.y) <= sel.ne.x)
 694                 sel.ne.x = term.col - 1;
 695 }
 696
 697 static inline bool
 698 selected(int x, int y) {
 699         if(sel.type == SEL_RECTANGULAR)
 700                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 701                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 702
 703         return BETWEEN(y, sel.nb.y, sel.ne.y)
 704             && (y != sel.nb.y || x >= sel.nb.x)
 705             && (y != sel.ne.y || x <= sel.ne.x);
 706 }
 707
 708 void
 709 selsnap(int mode, int *x, int *y, int direction) {
 710         int newx, newy, xt, yt;
 711         Glyph *gp;
 712
 713         switch(mode) {
 714         case SNAP_WORD:
 715                 /*
 716                  * Snap around if the word wraps around at the end or
 717                  * beginning of a line.
 718                  */
 719                 for(;;) {
 720                         newx = *x + direction;
 721                         newy = *y;
 722                         if(!BETWEEN(newx, 0, term.col - 1)) {
 723                                 newy += direction;
 724                                 newx = (newx + term.col) % term.col;
 725                                 if (!BETWEEN(newy, 0, term.row - 1))
 726                                         break;
 727
 728                                 if(direction > 0)
 729                                         yt = *y, xt = *x;
 730                                 else
 731                                         yt = newy, xt = newx;
 732                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 733                                         break;
 734                         }
 735
 736                         if (newx >= tlinelen(newy))
 737                                 break;
 738
 739                         gp = &term.line[newy][newx];
 740                         if (!(gp->mode & ATTR_WDUMMY) && strchr(worddelimiters, gp->c[0]))
 741                                 break;
 742
 743                         *x = newx;
 744                         *y = newy;
 745                 }
 746                 break;
 747         case SNAP_LINE:
 748                 /*
 749                  * Snap around if the the previous line or the current one
 750                  * has set ATTR_WRAP at its end. Then the whole next or
 751                  * previous line will be selected.
 752                  */
 753                 *x = (direction < 0) ? 0 : term.col - 1;
 754                 if(direction < 0 && *y > 0) {
 755                         for(; *y > 0; *y += direction) {
 756                                 if(!(term.line[*y-1][term.col-1].mode
 757                                                 & ATTR_WRAP)) {
 758                                         break;
 759                                 }
 760                         }
 761                 } else if(direction > 0 && *y < term.row-1) {
 762                         for(; *y < term.row; *y += direction) {
 763                                 if(!(term.line[*y][term.col-1].mode
 764                                                 & ATTR_WRAP)) {
 765                                         break;
 766                                 }
 767                         }
 768                 }
 769                 break;
 770         }
 771 }
 772
 773 void
 774 getbuttoninfo(XEvent *e) {
 775         int type;
 776         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 777
 778         sel.alt = IS_SET(MODE_ALTSCREEN);
 779
 780         sel.oe.x = x2col(e->xbutton.x);
 781         sel.oe.y = y2row(e->xbutton.y);
 782
 783         if(sel.ob.y < sel.oe.y
 784                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 785                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 786                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 787         } else {
 788                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 789                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 790         }
 791         selnormalize();
 792
 793         sel.type = SEL_REGULAR;
 794         for(type = 1; type < LEN(selmasks); ++type) {
 795                 if(match(selmasks[type], state)) {
 796                         sel.type = type;
 797                         break;
 798                 }
 799         }
 800 }
 801
 802 void
 803 mousereport(XEvent *e) {
 804         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 805             button = e->xbutton.button, state = e->xbutton.state,
 806             len;
 807         char buf[40];
 808         static int ox, oy;
 809
 810         /* from urxvt */
 811         if(e->xbutton.type == MotionNotify) {
 812                 if(x == ox && y == oy)
 813                         return;
 814                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 815                         return;
 816                 /* MOUSE_MOTION: no reporting if no button is pressed */
 817                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 818                         return;
 819
 820                 button = oldbutton + 32;
 821                 ox = x;
 822                 oy = y;
 823         } else {
 824                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 825                         button = 3;
 826                 } else {
 827                         button -= Button1;
 828                         if(button >= 3)
 829                                 button += 64 - 3;
 830                 }
 831                 if(e->xbutton.type == ButtonPress) {
 832                         oldbutton = button;
 833                         ox = x;
 834                         oy = y;
 835                 } else if(e->xbutton.type == ButtonRelease) {
 836                         oldbutton = 3;
 837                         /* MODE_MOUSEX10: no button release reporting */
 838                         if(IS_SET(MODE_MOUSEX10))
 839                                 return;
 840                         if (button == 64 || button == 65)
 841                                 return;
 842                 }
 843         }
 844
 845         if(!IS_SET(MODE_MOUSEX10)) {
 846                 button += (state & ShiftMask   ? 4  : 0)
 847                         + (state & Mod4Mask    ? 8  : 0)
 848                         + (state & ControlMask ? 16 : 0);
 849         }
 850
 851         len = 0;
 852         if(IS_SET(MODE_MOUSESGR)) {
 853                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 854                                 button, x+1, y+1,
 855                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 856         } else if(x < 223 && y < 223) {
 857                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 858                                 32+button, 32+x+1, 32+y+1);
 859         } else {
 860                 return;
 861         }
 862
 863         ttywrite(buf, len);
 864 }
 865
 866 void
 867 bpress(XEvent *e) {
 868         struct timespec now;
 869         Mousekey *mk;
 870
 871         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 872                 mousereport(e);
 873                 return;
 874         }
 875
 876         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 877                 if(e->xbutton.button == mk->b
 878                                 && match(mk->mask, e->xbutton.state)) {
 879                         ttysend(mk->s, strlen(mk->s));
 880                         return;
 881                 }
 882         }
 883
 884         if(e->xbutton.button == Button1) {
 885                 clock_gettime(CLOCK_MONOTONIC, &now);
 886
 887                 /* Clear previous selection, logically and visually. */
 888                 selclear(NULL);
 889                 sel.mode = 1;
 890                 sel.type = SEL_REGULAR;
 891                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 892                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 893
 894                 /*
 895                  * If the user clicks below predefined timeouts specific
 896                  * snapping behaviour is exposed.
 897                  */
 898                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 899                         sel.snap = SNAP_LINE;
 900                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 901                         sel.snap = SNAP_WORD;
 902                 } else {
 903                         sel.snap = 0;
 904                 }
 905                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 906                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 907                 selnormalize();
 908
 909                 /*
 910                  * Draw selection, unless it's regular and we don't want to
 911                  * make clicks visible
 912                  */
 913                 if(sel.snap != 0) {
 914                         sel.mode++;
 915                         tsetdirt(sel.nb.y, sel.ne.y);
 916                 }
 917                 sel.tclick2 = sel.tclick1;
 918                 sel.tclick1 = now;
 919         }
 920 }
 921
 922 char *
 923 getsel(void) {
 924         char *str, *ptr;
 925         int y, bufsize, size, lastx, linelen;
 926         Glyph *gp, *last;
 927
 928         if(sel.ob.x == -1)
 929                 return NULL;
 930
 931         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 932         ptr = str = xmalloc(bufsize);
 933
 934         /* append every set & selected glyph to the selection */
 935         for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 936                 linelen = tlinelen(y);
 937
 938                 if(sel.type == SEL_RECTANGULAR) {
 939                         gp = &term.line[y][sel.nb.x];
 940                         lastx = sel.ne.x;
 941                 } else {
 942                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
 943                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 944                 }
 945                 last = &term.line[y][MIN(lastx, linelen-1)];
 946
 947                 for( ; gp <= last; ++gp) {
 948                         if(gp->mode & ATTR_WDUMMY)
 949                                 continue;
 950
 951                         size = utf8len(gp->c);
 952                         memcpy(ptr, gp->c, size);
 953                         ptr += size;
 954                 }
 955
 956                 /*
 957                  * Copy and pasting of line endings is inconsistent
 958                  * in the inconsistent terminal and GUI world.
 959                  * The best solution seems like to produce '\n' when
 960                  * something is copied from st and convert '\n' to
 961                  * '\r', when something to be pasted is received by
 962                  * st.
 963                  * FIXME: Fix the computer world.
 964                  */
 965                 if(sel.ne.y > y || lastx >= linelen)
 966                         *ptr++ = '\n';
 967         }
 968         *ptr = 0;
 969         return str;
 970 }
 971
 972 void
 973 selcopy(void) {
 974         xsetsel(getsel());
 975 }
 976
 977 void
 978 selnotify(XEvent *e) {
 979         ulong nitems, ofs, rem;
 980         int format;
 981         uchar *data, *last, *repl;
 982         Atom type;
 983
 984         ofs = 0;
 985         do {
 986                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 987                                         False, AnyPropertyType, &type, &format,
 988                                         &nitems, &rem, &data)) {
 989                         fprintf(stderr, "Clipboard allocation failed\n");
 990                         return;
 991                 }
 992
 993                 /*
 994                  * As seen in getsel:
 995                  * Line endings are inconsistent in the terminal and GUI world
 996                  * copy and pasting. When receiving some selection data,
 997                  * replace all '\n' with '\r'.
 998                  * FIXME: Fix the computer world.
 999                  */
1000                 repl = data;
1001                 last = data + nitems * format / 8;
1002                 while((repl = memchr(repl, '\n', last - repl))) {
1003                         *repl++ = '\r';
1004                 }
1005
1006                 if(IS_SET(MODE_BRCKTPASTE))
1007                         ttywrite("\033[200~", 6);
1008                 ttysend((char *)data, nitems * format / 8);
1009                 if(IS_SET(MODE_BRCKTPASTE))
1010                         ttywrite("\033[201~", 6);
1011                 XFree(data);
1012                 /* number of 32-bit chunks returned */
1013                 ofs += nitems * format / 32;
1014         } while(rem > 0);
1015 }
1016
1017 void
1018 selpaste(const Arg *dummy) {
1019         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1020                         xw.win, CurrentTime);
1021 }
1022
1023 void
1024 clippaste(const Arg *dummy) {
1025         Atom clipboard;
1026
1027         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1028         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1029                         xw.win, CurrentTime);
1030 }
1031
1032 void
1033 selclear(XEvent *e) {
1034         if(sel.ob.x == -1)
1035                 return;
1036         sel.ob.x = -1;
1037         tsetdirt(sel.nb.y, sel.ne.y);
1038 }
1039
1040 void
1041 selrequest(XEvent *e) {
1042         XSelectionRequestEvent *xsre;
1043         XSelectionEvent xev;
1044         Atom xa_targets, string;
1045
1046         xsre = (XSelectionRequestEvent *) e;
1047         xev.type = SelectionNotify;
1048         xev.requestor = xsre->requestor;
1049         xev.selection = xsre->selection;
1050         xev.target = xsre->target;
1051         xev.time = xsre->time;
1052         /* reject */
1053         xev.property = None;
1054
1055         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1056         if(xsre->target == xa_targets) {
1057                 /* respond with the supported type */
1058                 string = sel.xtarget;
1059                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1060                                 XA_ATOM, 32, PropModeReplace,
1061                                 (uchar *) &string, 1);
1062                 xev.property = xsre->property;
1063         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1064                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1065                                 xsre->target, 8, PropModeReplace,
1066                                 (uchar *) sel.clip, strlen(sel.clip));
1067                 xev.property = xsre->property;
1068         }
1069
1070         /* all done, send a notification to the listener */
1071         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1072                 fprintf(stderr, "Error sending SelectionNotify event\n");
1073 }
1074
1075 void
1076 xsetsel(char *str) {
1077         /* register the selection for both the clipboard and the primary */
1078         Atom clipboard;
1079
1080         free(sel.clip);
1081         sel.clip = str;
1082
1083         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1084
1085         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1086         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1087 }
1088
1089 void
1090 brelease(XEvent *e) {
1091         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1092                 mousereport(e);
1093                 return;
1094         }
1095
1096         if(e->xbutton.button == Button2) {
1097                 selpaste(NULL);
1098         } else if(e->xbutton.button == Button1) {
1099                 if(sel.mode < 2) {
1100                         selclear(NULL);
1101                 } else {
1102                         getbuttoninfo(e);
1103                         selcopy();
1104                 }
1105                 sel.mode = 0;
1106                 tsetdirt(sel.nb.y, sel.ne.y);
1107         }
1108 }
1109
1110 void
1111 bmotion(XEvent *e) {
1112         int oldey, oldex, oldsby, oldsey;
1113
1114         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1115                 mousereport(e);
1116                 return;
1117         }
1118
1119         if(!sel.mode)
1120                 return;
1121
1122         sel.mode++;
1123         oldey = sel.oe.y;
1124         oldex = sel.oe.x;
1125         oldsby = sel.nb.y;
1126         oldsey = sel.ne.y;
1127         getbuttoninfo(e);
1128
1129         if(oldey != sel.oe.y || oldex != sel.oe.x)
1130                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1131 }
1132
1133 void
1134 die(const char *errstr, ...) {
1135         va_list ap;
1136
1137         va_start(ap, errstr);
1138         vfprintf(stderr, errstr, ap);
1139         va_end(ap);
1140         exit(EXIT_FAILURE);
1141 }
1142
1143 void
1144 execsh(void) {
1145         char **args;
1146         char *envshell = getenv("SHELL");
1147         const struct passwd *pass = getpwuid(getuid());
1148         char buf[sizeof(long) * 8 + 1];
1149
1150         unsetenv("COLUMNS");
1151         unsetenv("LINES");
1152         unsetenv("TERMCAP");
1153
1154         if(pass) {
1155                 setenv("LOGNAME", pass->pw_name, 1);
1156                 setenv("USER", pass->pw_name, 1);
1157                 setenv("SHELL", pass->pw_shell, 0);
1158                 setenv("HOME", pass->pw_dir, 0);
1159         }
1160
1161         snprintf(buf, sizeof(buf), "%lu", xw.win);
1162         setenv("WINDOWID", buf, 1);
1163
1164         signal(SIGCHLD, SIG_DFL);
1165         signal(SIGHUP, SIG_DFL);
1166         signal(SIGINT, SIG_DFL);
1167         signal(SIGQUIT, SIG_DFL);
1168         signal(SIGTERM, SIG_DFL);
1169         signal(SIGALRM, SIG_DFL);
1170
1171         DEFAULT(envshell, shell);
1172         setenv("TERM", termname, 1);
1173         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1174         execvp(args[0], args);
1175         exit(EXIT_FAILURE);
1176 }
1177
1178 void
1179 sigchld(int a) {
1180         int stat = 0;
1181
1182         if(waitpid(pid, &stat, 0) < 0)
1183                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1184
1185         if(WIFEXITED(stat)) {
1186                 exit(WEXITSTATUS(stat));
1187         } else {
1188                 exit(EXIT_FAILURE);
1189         }
1190 }
1191
1192 void
1193 ttynew(void) {
1194         int m, s;
1195         struct winsize w = {term.row, term.col, 0, 0};
1196
1197         /* seems to work fine on linux, openbsd and freebsd */
1198         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1199                 die("openpty failed: %s\n", strerror(errno));
1200
1201         switch(pid = fork()) {
1202         case -1:
1203                 die("fork failed\n");
1204                 break;
1205         case 0:
1206                 setsid(); /* create a new process group */
1207                 dup2(s, STDIN_FILENO);
1208                 dup2(s, STDOUT_FILENO);
1209                 dup2(s, STDERR_FILENO);
1210                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1211                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1212                 close(s);
1213                 close(m);
1214                 execsh();
1215                 break;
1216         default:
1217                 close(s);
1218                 cmdfd = m;
1219                 signal(SIGCHLD, sigchld);
1220                 if(opt_io) {
1221                         term.mode |= MODE_PRINT;
1222                         iofd = (!strcmp(opt_io, "-")) ?
1223                                   STDOUT_FILENO :
1224                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1225                         if(iofd < 0) {
1226                                 fprintf(stderr, "Error opening %s:%s\n",
1227                                         opt_io, strerror(errno));
1228                         }
1229                 }
1230                 break;
1231         }
1232 }
1233
1234 void
1235 ttyread(void) {
1236         static char buf[BUFSIZ];
1237         static int buflen = 0;
1238         char *ptr;
1239         char s[UTF_SIZ];
1240         int charsize; /* size of utf8 char in bytes */
1241         long unicodep;
1242         int ret;
1243
1244         /* append read bytes to unprocessed bytes */
1245         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1246                 die("Couldn't read from shell: %s\n", strerror(errno));
1247
1248         /* process every complete utf8 char */
1249         buflen += ret;
1250         ptr = buf;
1251         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1252                 utf8encode(unicodep, s, UTF_SIZ);
1253                 tputc(s, charsize);
1254                 ptr += charsize;
1255                 buflen -= charsize;
1256         }
1257
1258         /* keep any uncomplete utf8 char for the next call */
1259         memmove(buf, ptr, buflen);
1260 }
1261
1262 void
1263 ttywrite(const char *s, size_t n) {
1264         if(xwrite(cmdfd, s, n) == -1)
1265                 die("write error on tty: %s\n", strerror(errno));
1266 }
1267
1268 void
1269 ttysend(char *s, size_t n) {
1270         ttywrite(s, n);
1271         if(IS_SET(MODE_ECHO))
1272                 techo(s, n);
1273 }
1274
1275 void
1276 ttyresize(void) {
1277         struct winsize w;
1278
1279         w.ws_row = term.row;
1280         w.ws_col = term.col;
1281         w.ws_xpixel = xw.tw;
1282         w.ws_ypixel = xw.th;
1283         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1284                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1285 }
1286
1287 int
1288 tattrset(int attr) {
1289         int i, j;
1290
1291         for(i = 0; i < term.row-1; i++) {
1292                 for(j = 0; j < term.col-1; j++) {
1293                         if(term.line[i][j].mode & attr)
1294                                 return 1;
1295                 }
1296         }
1297
1298         return 0;
1299 }
1300
1301 void
1302 tsetdirt(int top, int bot) {
1303         int i;
1304
1305         LIMIT(top, 0, term.row-1);
1306         LIMIT(bot, 0, term.row-1);
1307
1308         for(i = top; i <= bot; i++)
1309                 term.dirty[i] = 1;
1310 }
1311
1312 void
1313 tsetdirtattr(int attr) {
1314         int i, j;
1315
1316         for(i = 0; i < term.row-1; i++) {
1317                 for(j = 0; j < term.col-1; j++) {
1318                         if(term.line[i][j].mode & attr) {
1319                                 tsetdirt(i, i);
1320                                 break;
1321                         }
1322                 }
1323         }
1324 }
1325
1326 void
1327 tfulldirt(void) {
1328         tsetdirt(0, term.row-1);
1329 }
1330
1331 void
1332 tcursor(int mode) {
1333         static TCursor c[2];
1334         bool alt = IS_SET(MODE_ALTSCREEN);
1335
1336         if(mode == CURSOR_SAVE) {
1337                 c[alt] = term.c;
1338         } else if(mode == CURSOR_LOAD) {
1339                 term.c = c[alt];
1340                 tmoveto(c[alt].x, c[alt].y);
1341         }
1342 }
1343
1344 void
1345 treset(void) {
1346         uint i;
1347
1348         term.c = (TCursor){{
1349                 .mode = ATTR_NULL,
1350                 .fg = defaultfg,
1351                 .bg = defaultbg
1352         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1353
1354         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1355         for(i = tabspaces; i < term.col; i += tabspaces)
1356                 term.tabs[i] = 1;
1357         term.top = 0;
1358         term.bot = term.row - 1;
1359         term.mode = MODE_WRAP;
1360         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1361         term.charset = 0;
1362
1363         tclearregion(0, 0, term.col-1, term.row-1);
1364         tmoveto(0, 0);
1365         tcursor(CURSOR_SAVE);
1366 }
1367
1368 void
1369 tnew(int col, int row) {
1370         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1371         tresize(col, row);
1372         term.numlock = 1;
1373
1374         treset();
1375 }
1376
1377 void
1378 tswapscreen(void) {
1379         Line *tmp = term.line;
1380
1381         term.line = term.alt;
1382         term.alt = tmp;
1383         term.mode ^= MODE_ALTSCREEN;
1384         tfulldirt();
1385 }
1386
1387 void
1388 tscrolldown(int orig, int n) {
1389         int i;
1390         Line temp;
1391
1392         LIMIT(n, 0, term.bot-orig+1);
1393
1394         tsetdirt(orig, term.bot-n);
1395         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1396
1397         for(i = term.bot; i >= orig+n; i--) {
1398                 temp = term.line[i];
1399                 term.line[i] = term.line[i-n];
1400                 term.line[i-n] = temp;
1401         }
1402
1403         selscroll(orig, n);
1404 }
1405
1406 void
1407 tscrollup(int orig, int n) {
1408         int i;
1409         Line temp;
1410
1411         LIMIT(n, 0, term.bot-orig+1);
1412
1413         tclearregion(0, orig, term.col-1, orig+n-1);
1414         tsetdirt(orig+n, term.bot);
1415
1416         for(i = orig; i <= term.bot-n; i++) {
1417                 temp = term.line[i];
1418                 term.line[i] = term.line[i+n];
1419                 term.line[i+n] = temp;
1420         }
1421
1422         selscroll(orig, -n);
1423 }
1424
1425 void
1426 selscroll(int orig, int n) {
1427         if(sel.ob.x == -1)
1428                 return;
1429
1430         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1431                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1432                         selclear(NULL);
1433                         return;
1434                 }
1435                 if(sel.type == SEL_RECTANGULAR) {
1436                         if(sel.ob.y < term.top)
1437                                 sel.ob.y = term.top;
1438                         if(sel.oe.y > term.bot)
1439                                 sel.oe.y = term.bot;
1440                 } else {
1441                         if(sel.ob.y < term.top) {
1442                                 sel.ob.y = term.top;
1443                                 sel.ob.x = 0;
1444                         }
1445                         if(sel.oe.y > term.bot) {
1446                                 sel.oe.y = term.bot;
1447                                 sel.oe.x = term.col;
1448                         }
1449                 }
1450                 selnormalize();
1451         }
1452 }
1453
1454 void
1455 tnewline(int first_col) {
1456         int y = term.c.y;
1457
1458         if(y == term.bot) {
1459                 tscrollup(term.top, 1);
1460         } else {
1461                 y++;
1462         }
1463         tmoveto(first_col ? 0 : term.c.x, y);
1464 }
1465
1466 void
1467 csiparse(void) {
1468         char *p = csiescseq.buf, *np;
1469         long int v;
1470
1471         csiescseq.narg = 0;
1472         if(*p == '?') {
1473                 csiescseq.priv = 1;
1474                 p++;
1475         }
1476
1477         csiescseq.buf[csiescseq.len] = '\0';
1478         while(p < csiescseq.buf+csiescseq.len) {
1479                 np = NULL;
1480                 v = strtol(p, &np, 10);
1481                 if(np == p)
1482                         v = 0;
1483                 if(v == LONG_MAX || v == LONG_MIN)
1484                         v = -1;
1485                 csiescseq.arg[csiescseq.narg++] = v;
1486                 p = np;
1487                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1488                         break;
1489                 p++;
1490         }
1491         csiescseq.mode = *p;
1492 }
1493
1494 /* for absolute user moves, when decom is set */
1495 void
1496 tmoveato(int x, int y) {
1497         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1498 }
1499
1500 void
1501 tmoveto(int x, int y) {
1502         int miny, maxy;
1503
1504         if(term.c.state & CURSOR_ORIGIN) {
1505                 miny = term.top;
1506                 maxy = term.bot;
1507         } else {
1508                 miny = 0;
1509                 maxy = term.row - 1;
1510         }
1511         LIMIT(x, 0, term.col-1);
1512         LIMIT(y, miny, maxy);
1513         term.c.state &= ~CURSOR_WRAPNEXT;
1514         term.c.x = x;
1515         term.c.y = y;
1516 }
1517
1518 void
1519 tsetchar(char *c, Glyph *attr, int x, int y) {
1520         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1521                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1522                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1523                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1524                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1525                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1526                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1527                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1528                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1529         };
1530
1531         /*
1532          * The table is proudly stolen from rxvt.
1533          */
1534         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1535                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1536                         c = vt100_0[c[0] - 0x41];
1537                 }
1538         }
1539
1540         if(term.line[y][x].mode & ATTR_WIDE) {
1541                 if(x+1 < term.col) {
1542                         term.line[y][x+1].c[0] = ' ';
1543                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1544                 }
1545         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1546                 term.line[y][x-1].c[0] = ' ';
1547                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1548         }
1549
1550         term.dirty[y] = 1;
1551         term.line[y][x] = *attr;
1552         memcpy(term.line[y][x].c, c, UTF_SIZ);
1553 }
1554
1555 void
1556 tclearregion(int x1, int y1, int x2, int y2) {
1557         int x, y, temp;
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                         if(selected(x, y))
1573                                 selclear(NULL);
1574                         term.line[y][x] = term.c.attr;
1575                         memcpy(term.line[y][x].c, " ", 2);
1576                 }
1577         }
1578 }
1579
1580 void
1581 tdeletechar(int n) {
1582         int dst, src, size;
1583         Glyph *line;
1584
1585         LIMIT(n, 0, term.col - term.c.x);
1586
1587         dst = term.c.x;
1588         src = term.c.x + n;
1589         size = term.col - src;
1590         line = term.line[term.c.y];
1591
1592         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1593         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1594 }
1595
1596 void
1597 tinsertblank(int n) {
1598         int dst, src, size;
1599         Glyph *line;
1600
1601         LIMIT(n, 0, term.col - term.c.x);
1602
1603         dst = term.c.x + n;
1604         src = term.c.x;
1605         size = term.col - dst;
1606         line = term.line[term.c.y];
1607
1608         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1609         tclearregion(src, term.c.y, dst - 1, term.c.y);
1610 }
1611
1612 void
1613 tinsertblankline(int n) {
1614         if(BETWEEN(term.c.y, term.top, term.bot))
1615                 tscrolldown(term.c.y, n);
1616 }
1617
1618 void
1619 tdeleteline(int n) {
1620         if(BETWEEN(term.c.y, term.top, term.bot))
1621                 tscrollup(term.c.y, n);
1622 }
1623
1624 int32_t
1625 tdefcolor(int *attr, int *npar, int l) {
1626         int32_t idx = -1;
1627         uint r, g, b;
1628
1629         switch (attr[*npar + 1]) {
1630         case 2: /* direct color in RGB space */
1631                 if (*npar + 4 >= l) {
1632                         fprintf(stderr,
1633                                 "erresc(38): Incorrect number of parameters (%d)\n",
1634                                 *npar);
1635                         break;
1636                 }
1637                 r = attr[*npar + 2];
1638                 g = attr[*npar + 3];
1639                 b = attr[*npar + 4];
1640                 *npar += 4;
1641                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1642                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1643                                 r, g, b);
1644                 else
1645                         idx = TRUECOLOR(r, g, b);
1646                 break;
1647         case 5: /* indexed color */
1648                 if (*npar + 2 >= l) {
1649                         fprintf(stderr,
1650                                 "erresc(38): Incorrect number of parameters (%d)\n",
1651                                 *npar);
1652                         break;
1653                 }
1654                 *npar += 2;
1655                 if(!BETWEEN(attr[*npar], 0, 255))
1656                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1657                 else
1658                         idx = attr[*npar];
1659                 break;
1660         case 0: /* implemented defined (only foreground) */
1661         case 1: /* transparent */
1662         case 3: /* direct color in CMY space */
1663         case 4: /* direct color in CMYK space */
1664         default:
1665                 fprintf(stderr,
1666                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1667                 break;
1668         }
1669
1670         return idx;
1671 }
1672
1673 void
1674 tsetattr(int *attr, int l) {
1675         int i;
1676         int32_t idx;
1677
1678         for(i = 0; i < l; i++) {
1679                 switch(attr[i]) {
1680                 case 0:
1681                         term.c.attr.mode &= ~(
1682                                 ATTR_BOLD       |
1683                                 ATTR_FAINT      |
1684                                 ATTR_ITALIC     |
1685                                 ATTR_UNDERLINE  |
1686                                 ATTR_BLINK      |
1687                                 ATTR_FASTBLINK  |
1688                                 ATTR_REVERSE    |
1689                                 ATTR_INVISIBLE  |
1690                                 ATTR_STRUCK     );
1691                         term.c.attr.fg = defaultfg;
1692                         term.c.attr.bg = defaultbg;
1693                         break;
1694                 case 1:
1695                         term.c.attr.mode |= ATTR_BOLD;
1696                         break;
1697                 case 2:
1698                         term.c.attr.mode |= ATTR_FAINT;
1699                         break;
1700                 case 3:
1701                         term.c.attr.mode |= ATTR_ITALIC;
1702                         break;
1703                 case 4:
1704                         term.c.attr.mode |= ATTR_UNDERLINE;
1705                         break;
1706                 case 5: /* slow blink */
1707                         term.c.attr.mode |= ATTR_BLINK;
1708                         break;
1709                 case 6: /* rapid blink */
1710                         term.c.attr.mode |= ATTR_FASTBLINK;
1711                         break;
1712                 case 7:
1713                         term.c.attr.mode |= ATTR_REVERSE;
1714                         break;
1715                 case 8:
1716                         term.c.attr.mode |= ATTR_INVISIBLE;
1717                         break;
1718                 case 9:
1719                         term.c.attr.mode |= ATTR_STRUCK;
1720                         break;
1721                 case 22:
1722                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1723                         break;
1724                 case 23:
1725                         term.c.attr.mode &= ~ATTR_ITALIC;
1726                         break;
1727                 case 24:
1728                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1729                         break;
1730                 case 25:
1731                         term.c.attr.mode &= ~(ATTR_BLINK | ATTR_FASTBLINK);
1732                         break;
1733                 case 27:
1734                         term.c.attr.mode &= ~ATTR_REVERSE;
1735                         break;
1736                 case 28:
1737                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1738                         break;
1739                 case 29:
1740                         term.c.attr.mode &= ~ATTR_STRUCK;
1741                         break;
1742                 case 38:
1743                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1744                                 term.c.attr.fg = idx;
1745                         break;
1746                 case 39:
1747                         term.c.attr.fg = defaultfg;
1748                         break;
1749                 case 48:
1750                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1751                                 term.c.attr.bg = idx;
1752                         break;
1753                 case 49:
1754                         term.c.attr.bg = defaultbg;
1755                         break;
1756                 default:
1757                         if(BETWEEN(attr[i], 30, 37)) {
1758                                 term.c.attr.fg = attr[i] - 30;
1759                         } else if(BETWEEN(attr[i], 40, 47)) {
1760                                 term.c.attr.bg = attr[i] - 40;
1761                         } else if(BETWEEN(attr[i], 90, 97)) {
1762                                 term.c.attr.fg = attr[i] - 90 + 8;
1763                         } else if(BETWEEN(attr[i], 100, 107)) {
1764                                 term.c.attr.bg = attr[i] - 100 + 8;
1765                         } else {
1766                                 fprintf(stderr,
1767                                         "erresc(default): gfx attr %d unknown\n",
1768                                         attr[i]), csidump();
1769                         }
1770                         break;
1771                 }
1772         }
1773 }
1774
1775 void
1776 tsetscroll(int t, int b) {
1777         int temp;
1778
1779         LIMIT(t, 0, term.row-1);
1780         LIMIT(b, 0, term.row-1);
1781         if(t > b) {
1782                 temp = t;
1783                 t = b;
1784                 b = temp;
1785         }
1786         term.top = t;
1787         term.bot = b;
1788 }
1789
1790 void
1791 tsetmode(bool priv, bool set, int *args, int narg) {
1792         int *lim, mode;
1793         bool alt;
1794
1795         for(lim = args + narg; args < lim; ++args) {
1796                 if(priv) {
1797                         switch(*args) {
1798                         case 1: /* DECCKM -- Cursor key */
1799                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1800                                 break;
1801                         case 5: /* DECSCNM -- Reverse video */
1802                                 mode = term.mode;
1803                                 MODBIT(term.mode, set, MODE_REVERSE);
1804                                 if(mode != term.mode)
1805                                         redraw(REDRAW_TIMEOUT);
1806                                 break;
1807                         case 6: /* DECOM -- Origin */
1808                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1809                                 tmoveato(0, 0);
1810                                 break;
1811                         case 7: /* DECAWM -- Auto wrap */
1812                                 MODBIT(term.mode, set, MODE_WRAP);
1813                                 break;
1814                         case 0:  /* Error (IGNORED) */
1815                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1816                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1817                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1818                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1819                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1820                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1821                         case 42: /* DECNRCM -- National characters (IGNORED) */
1822                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1823                                 break;
1824                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1825                                 MODBIT(term.mode, !set, MODE_HIDE);
1826                                 break;
1827                         case 9:    /* X10 mouse compatibility mode */
1828                                 xsetpointermotion(0);
1829                                 MODBIT(term.mode, 0, MODE_MOUSE);
1830                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1831                                 break;
1832                         case 1000: /* 1000: report button press */
1833                                 xsetpointermotion(0);
1834                                 MODBIT(term.mode, 0, MODE_MOUSE);
1835                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1836                                 break;
1837                         case 1002: /* 1002: report motion on button press */
1838                                 xsetpointermotion(0);
1839                                 MODBIT(term.mode, 0, MODE_MOUSE);
1840                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1841                                 break;
1842                         case 1003: /* 1003: enable all mouse motions */
1843                                 xsetpointermotion(set);
1844                                 MODBIT(term.mode, 0, MODE_MOUSE);
1845                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1846                                 break;
1847                         case 1004: /* 1004: send focus events to tty */
1848                                 MODBIT(term.mode, set, MODE_FOCUS);
1849                                 break;
1850                         case 1006: /* 1006: extended reporting mode */
1851                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1852                                 break;
1853                         case 1034:
1854                                 MODBIT(term.mode, set, MODE_8BIT);
1855                                 break;
1856                         case 1049: /* swap screen & set/restore cursor as xterm */
1857                                 if (!allowaltscreen)
1858                                         break;
1859                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1860                                 /* FALLTHROUGH */
1861                         case 47: /* swap screen */
1862                         case 1047:
1863                                 if (!allowaltscreen)
1864                                         break;
1865                                 alt = IS_SET(MODE_ALTSCREEN);
1866                                 if(alt) {
1867                                         tclearregion(0, 0, term.col-1,
1868                                                         term.row-1);
1869                                 }
1870                                 if(set ^ alt) /* set is always 1 or 0 */
1871                                         tswapscreen();
1872                                 if(*args != 1049)
1873                                         break;
1874                                 /* FALLTHROUGH */
1875                         case 1048:
1876                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1877                                 break;
1878                         case 2004: /* 2004: bracketed paste mode */
1879                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1880                                 break;
1881                         /* Not implemented mouse modes. See comments there. */
1882                         case 1001: /* mouse highlight mode; can hang the
1883                                       terminal by design when implemented. */
1884                         case 1005: /* UTF-8 mouse mode; will confuse
1885                                       applications not supporting UTF-8
1886                                       and luit. */
1887                         case 1015: /* urxvt mangled mouse mode; incompatible
1888                                       and can be mistaken for other control
1889                                       codes. */
1890                         default:
1891                                 fprintf(stderr,
1892                                         "erresc: unknown private set/reset mode %d\n",
1893                                         *args);
1894                                 break;
1895                         }
1896                 } else {
1897                         switch(*args) {
1898                         case 0:  /* Error (IGNORED) */
1899                                 break;
1900                         case 2:  /* KAM -- keyboard action */
1901                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1902                                 break;
1903                         case 4:  /* IRM -- Insertion-replacement */
1904                                 MODBIT(term.mode, set, MODE_INSERT);
1905                                 break;
1906                         case 12: /* SRM -- Send/Receive */
1907                                 MODBIT(term.mode, !set, MODE_ECHO);
1908                                 break;
1909                         case 20: /* LNM -- Linefeed/new line */
1910                                 MODBIT(term.mode, set, MODE_CRLF);
1911                                 break;
1912                         default:
1913                                 fprintf(stderr,
1914                                         "erresc: unknown set/reset mode %d\n",
1915                                         *args);
1916                                 break;
1917                         }
1918                 }
1919         }
1920 }
1921
1922 void
1923 csihandle(void) {
1924         char buf[40];
1925         int len;
1926
1927         switch(csiescseq.mode) {
1928         default:
1929         unknown:
1930                 fprintf(stderr, "erresc: unknown csi ");
1931                 csidump();
1932                 /* die(""); */
1933                 break;
1934         case '@': /* ICH -- Insert <n> blank char */
1935                 DEFAULT(csiescseq.arg[0], 1);
1936                 tinsertblank(csiescseq.arg[0]);
1937                 break;
1938         case 'A': /* CUU -- Cursor <n> Up */
1939                 DEFAULT(csiescseq.arg[0], 1);
1940                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1941                 break;
1942         case 'B': /* CUD -- Cursor <n> Down */
1943         case 'e': /* VPR --Cursor <n> Down */
1944                 DEFAULT(csiescseq.arg[0], 1);
1945                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1946                 break;
1947         case 'i': /* MC -- Media Copy */
1948                 switch(csiescseq.arg[0]) {
1949                 case 0:
1950                         tdump();
1951                         break;
1952                 case 1:
1953                         tdumpline(term.c.y);
1954                         break;
1955                 case 2:
1956                         tdumpsel();
1957                         break;
1958                 case 4:
1959                         term.mode &= ~MODE_PRINT;
1960                         break;
1961                 case 5:
1962                         term.mode |= MODE_PRINT;
1963                         break;
1964                 }
1965                 break;
1966         case 'c': /* DA -- Device Attributes */
1967                 if(csiescseq.arg[0] == 0)
1968                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1969                 break;
1970         case 'C': /* CUF -- Cursor <n> Forward */
1971         case 'a': /* HPR -- Cursor <n> Forward */
1972                 DEFAULT(csiescseq.arg[0], 1);
1973                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1974                 break;
1975         case 'D': /* CUB -- Cursor <n> Backward */
1976                 DEFAULT(csiescseq.arg[0], 1);
1977                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1978                 break;
1979         case 'E': /* CNL -- Cursor <n> Down and first col */
1980                 DEFAULT(csiescseq.arg[0], 1);
1981                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1982                 break;
1983         case 'F': /* CPL -- Cursor <n> Up and first col */
1984                 DEFAULT(csiescseq.arg[0], 1);
1985                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1986                 break;
1987         case 'g': /* TBC -- Tabulation clear */
1988                 switch(csiescseq.arg[0]) {
1989                 case 0: /* clear current tab stop */
1990                         term.tabs[term.c.x] = 0;
1991                         break;
1992                 case 3: /* clear all the tabs */
1993                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1994                         break;
1995                 default:
1996                         goto unknown;
1997                 }
1998                 break;
1999         case 'G': /* CHA -- Move to <col> */
2000         case '`': /* HPA */
2001                 DEFAULT(csiescseq.arg[0], 1);
2002                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2003                 break;
2004         case 'H': /* CUP -- Move to <row> <col> */
2005         case 'f': /* HVP */
2006                 DEFAULT(csiescseq.arg[0], 1);
2007                 DEFAULT(csiescseq.arg[1], 1);
2008                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2009                 break;
2010         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2011                 DEFAULT(csiescseq.arg[0], 1);
2012                 tputtab(csiescseq.arg[0]);
2013                 break;
2014         case 'J': /* ED -- Clear screen */
2015                 selclear(NULL);
2016                 switch(csiescseq.arg[0]) {
2017                 case 0: /* below */
2018                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2019                         if(term.c.y < term.row-1) {
2020                                 tclearregion(0, term.c.y+1, term.col-1,
2021                                                 term.row-1);
2022                         }
2023                         break;
2024                 case 1: /* above */
2025                         if(term.c.y > 1)
2026                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2027                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2028                         break;
2029                 case 2: /* all */
2030                         tclearregion(0, 0, term.col-1, term.row-1);
2031                         break;
2032                 default:
2033                         goto unknown;
2034                 }
2035                 break;
2036         case 'K': /* EL -- Clear line */
2037                 switch(csiescseq.arg[0]) {
2038                 case 0: /* right */
2039                         tclearregion(term.c.x, term.c.y, term.col-1,
2040                                         term.c.y);
2041                         break;
2042                 case 1: /* left */
2043                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2044                         break;
2045                 case 2: /* all */
2046                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2047                         break;
2048                 }
2049                 break;
2050         case 'S': /* SU -- Scroll <n> line up */
2051                 DEFAULT(csiescseq.arg[0], 1);
2052                 tscrollup(term.top, csiescseq.arg[0]);
2053                 break;
2054         case 'T': /* SD -- Scroll <n> line down */
2055                 DEFAULT(csiescseq.arg[0], 1);
2056                 tscrolldown(term.top, csiescseq.arg[0]);
2057                 break;
2058         case 'L': /* IL -- Insert <n> blank lines */
2059                 DEFAULT(csiescseq.arg[0], 1);
2060                 tinsertblankline(csiescseq.arg[0]);
2061                 break;
2062         case 'l': /* RM -- Reset Mode */
2063                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2064                 break;
2065         case 'M': /* DL -- Delete <n> lines */
2066                 DEFAULT(csiescseq.arg[0], 1);
2067                 tdeleteline(csiescseq.arg[0]);
2068                 break;
2069         case 'X': /* ECH -- Erase <n> char */
2070                 DEFAULT(csiescseq.arg[0], 1);
2071                 tclearregion(term.c.x, term.c.y,
2072                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2073                 break;
2074         case 'P': /* DCH -- Delete <n> char */
2075                 DEFAULT(csiescseq.arg[0], 1);
2076                 tdeletechar(csiescseq.arg[0]);
2077                 break;
2078         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2079                 DEFAULT(csiescseq.arg[0], 1);
2080                 tputtab(-csiescseq.arg[0]);
2081                 break;
2082         case 'd': /* VPA -- Move to <row> */
2083                 DEFAULT(csiescseq.arg[0], 1);
2084                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2085                 break;
2086         case 'h': /* SM -- Set terminal mode */
2087                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2088                 break;
2089         case 'm': /* SGR -- Terminal attribute (color) */
2090                 tsetattr(csiescseq.arg, csiescseq.narg);
2091                 break;
2092         case 'n': /* DSR – Device Status Report (cursor position) */
2093                 if (csiescseq.arg[0] == 6) {
2094                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2095                                         term.c.y+1, term.c.x+1);
2096                         ttywrite(buf, len);
2097                 }
2098                 break;
2099         case 'r': /* DECSTBM -- Set Scrolling Region */
2100                 if(csiescseq.priv) {
2101                         goto unknown;
2102                 } else {
2103                         DEFAULT(csiescseq.arg[0], 1);
2104                         DEFAULT(csiescseq.arg[1], term.row);
2105                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2106                         tmoveato(0, 0);
2107                 }
2108                 break;
2109         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2110                 tcursor(CURSOR_SAVE);
2111                 break;
2112         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2113                 tcursor(CURSOR_LOAD);
2114                 break;
2115         }
2116 }
2117
2118 void
2119 csidump(void) {
2120         int i;
2121         uint c;
2122
2123         printf("ESC[");
2124         for(i = 0; i < csiescseq.len; i++) {
2125                 c = csiescseq.buf[i] & 0xff;
2126                 if(isprint(c)) {
2127                         putchar(c);
2128                 } else if(c == '\n') {
2129                         printf("(\\n)");
2130                 } else if(c == '\r') {
2131                         printf("(\\r)");
2132                 } else if(c == 0x1b) {
2133                         printf("(\\e)");
2134                 } else {
2135                         printf("(%02x)", c);
2136                 }
2137         }
2138         putchar('\n');
2139 }
2140
2141 void
2142 csireset(void) {
2143         memset(&csiescseq, 0, sizeof(csiescseq));
2144 }
2145
2146 void
2147 strhandle(void) {
2148         char *p = NULL;
2149         int j, narg, par;
2150
2151         term.esc &= ~(ESC_STR_END|ESC_STR);
2152         strparse();
2153         narg = strescseq.narg;
2154         par = atoi(strescseq.args[0]);
2155
2156         switch(strescseq.type) {
2157         case ']': /* OSC -- Operating System Command */
2158                 switch(par) {
2159                 case 0:
2160                 case 1:
2161                 case 2:
2162                         if(narg > 1)
2163                                 xsettitle(strescseq.args[1]);
2164                         return;
2165                 case 4: /* color set */
2166                         if(narg < 3)
2167                                 break;
2168                         p = strescseq.args[2];
2169                         /* FALLTHROUGH */
2170                 case 104: /* color reset, here p = NULL */
2171                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2172                         if(xsetcolorname(j, p)) {
2173                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2174                         } else {
2175                                 /*
2176                                  * TODO if defaultbg color is changed, borders
2177                                  * are dirty
2178                                  */
2179                                 redraw(0);
2180                         }
2181                         return;
2182                 }
2183                 break;
2184         case 'k': /* old title set compatibility */
2185                 xsettitle(strescseq.args[0]);
2186                 return;
2187         case 'P': /* DCS -- Device Control String */
2188         case '_': /* APC -- Application Program Command */
2189         case '^': /* PM -- Privacy Message */
2190                 return;
2191         }
2192
2193         fprintf(stderr, "erresc: unknown str ");
2194         strdump();
2195 }
2196
2197 void
2198 strparse(void) {
2199         char *p = strescseq.buf;
2200
2201         strescseq.narg = 0;
2202         strescseq.buf[strescseq.len] = '\0';
2203         while(p && strescseq.narg < STR_ARG_SIZ)
2204                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2205 }
2206
2207 void
2208 strdump(void) {
2209         int i;
2210         uint c;
2211
2212         printf("ESC%c", strescseq.type);
2213         for(i = 0; i < strescseq.len; i++) {
2214                 c = strescseq.buf[i] & 0xff;
2215                 if(c == '\0') {
2216                         return;
2217                 } else if(isprint(c)) {
2218                         putchar(c);
2219                 } else if(c == '\n') {
2220                         printf("(\\n)");
2221                 } else if(c == '\r') {
2222                         printf("(\\r)");
2223                 } else if(c == 0x1b) {
2224                         printf("(\\e)");
2225                 } else {
2226                         printf("(%02x)", c);
2227                 }
2228         }
2229         printf("ESC\\\n");
2230 }
2231
2232 void
2233 strreset(void) {
2234         memset(&strescseq, 0, sizeof(strescseq));
2235 }
2236
2237 void
2238 tprinter(char *s, size_t len) {
2239         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2240                 fprintf(stderr, "Error writing in %s:%s\n",
2241                         opt_io, strerror(errno));
2242                 close(iofd);
2243                 iofd = -1;
2244         }
2245 }
2246
2247 void
2248 toggleprinter(const Arg *arg) {
2249         term.mode ^= MODE_PRINT;
2250 }
2251
2252 void
2253 printscreen(const Arg *arg) {
2254         tdump();
2255 }
2256
2257 void
2258 printsel(const Arg *arg) {
2259         tdumpsel();
2260 }
2261
2262 void
2263 tdumpsel(void) {
2264         char *ptr;
2265
2266         if((ptr = getsel())) {
2267                 tprinter(ptr, strlen(ptr));
2268                 free(ptr);
2269         }
2270 }
2271
2272 void
2273 tdumpline(int n) {
2274         Glyph *bp, *end;
2275
2276         bp = &term.line[n][0];
2277         end = &bp[MIN(tlinelen(n), term.col) - 1];
2278         if(bp != end || bp->c[0] != ' ') {
2279                 for( ;bp <= end; ++bp)
2280                         tprinter(bp->c, utf8len(bp->c));
2281         }
2282         tprinter("\n", 1);
2283 }
2284
2285 void
2286 tdump(void) {
2287         int i;
2288
2289         for(i = 0; i < term.row; ++i)
2290                 tdumpline(i);
2291 }
2292
2293 void
2294 tputtab(int n) {
2295         uint x = term.c.x;
2296
2297         if(n > 0) {
2298                 while(x < term.col && n--)
2299                         for(++x; x < term.col && !term.tabs[x]; ++x)
2300                                 /* nothing */ ;
2301         } else if(n < 0) {
2302                 while(x > 0 && n++)
2303                         for(--x; x > 0 && !term.tabs[x]; --x)
2304                                 /* nothing */ ;
2305         }
2306         tmoveto(x, term.c.y);
2307 }
2308
2309 void
2310 techo(char *buf, int len) {
2311         for(; len > 0; buf++, len--) {
2312                 char c = *buf;
2313
2314                 if(ISCONTROL(c)) { /* control code */
2315                         if(c & 0x80) {
2316                                 c &= 0x7f;
2317                                 tputc("^", 1);
2318                                 tputc("[", 1);
2319                         } else if(c != '\n' && c != '\r' && c != '\t') {
2320                                 c ^= '\x40';
2321                                 tputc("^", 1);
2322                         }
2323                         tputc(&c, 1);
2324                 } else {
2325                         break;
2326                 }
2327         }
2328         if(len)
2329                 tputc(buf, len);
2330 }
2331
2332 void
2333 tdeftran(char ascii) {
2334         static char cs[] = "0B";
2335         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2336         char *p;
2337
2338         if((p = strchr(cs, ascii)) == NULL) {
2339                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2340         } else {
2341                 term.trantbl[term.icharset] = vcs[p - cs];
2342         }
2343 }
2344
2345 void
2346 tstrsequence(uchar c) {
2347         if (c & 0x80) {
2348                 switch (c) {
2349                 case 0x90:   /* DCS -- Device Control String */
2350                         c = 'P';
2351                         break;
2352                 case 0x9f:   /* APC -- Application Program Command */
2353                         c = '_';
2354                         break;
2355                 case 0x9e:   /* PM -- Privacy Message */
2356                         c = '^';
2357                         break;
2358                 case 0x9d:   /* OSC -- Operating System Command */
2359                         c = ']';
2360                         break;
2361                 }
2362         }
2363         strreset();
2364         strescseq.type = c;
2365         term.esc |= ESC_STR;
2366         return;
2367 }
2368
2369 void
2370 tcontrolcode(uchar ascii) {
2371         static char question[UTF_SIZ] = "?";
2372
2373         switch(ascii) {
2374         case '\t':   /* HT */
2375                 tputtab(1);
2376                 return;
2377         case '\b':   /* BS */
2378                 tmoveto(term.c.x-1, term.c.y);
2379                 return;
2380         case '\r':   /* CR */
2381                 tmoveto(0, term.c.y);
2382                 return;
2383         case '\f':   /* LF */
2384         case '\v':   /* VT */
2385         case '\n':   /* LF */
2386                 /* go to first col if the mode is set */
2387                 tnewline(IS_SET(MODE_CRLF));
2388                 return;
2389         case '\a':   /* BEL */
2390                 if(term.esc & ESC_STR_END) {
2391                         /* backwards compatibility to xterm */
2392                         strhandle();
2393                 } else {
2394                         if(!(xw.state & WIN_FOCUSED))
2395                                 xseturgency(1);
2396                         if (bellvolume)
2397                                 XBell(xw.dpy, bellvolume);
2398                 }
2399                 break;
2400         case '\033': /* ESC */
2401                 csireset();
2402                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2403                 term.esc |= ESC_START;
2404                 return;
2405         case '\016': /* SO */
2406                 term.charset = 0;
2407                 return;
2408         case '\017': /* SI */
2409                 term.charset = 1;
2410                 return;
2411         case '\032': /* SUB */
2412                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2413         case '\030': /* CAN */
2414                 csireset();
2415                 break;
2416         case '\005': /* ENQ (IGNORED) */
2417         case '\000': /* NUL (IGNORED) */
2418         case '\021': /* XON (IGNORED) */
2419         case '\023': /* XOFF (IGNORED) */
2420         case 0177:   /* DEL (IGNORED) */
2421                 return;
2422         case 0x84:   /* TODO: IND */
2423                 break;
2424         case 0x85:   /* NEL -- Next line */
2425                 tnewline(1); /* always go to first col */
2426                 break;
2427         case 0x88:   /* HTS -- Horizontal tab stop */
2428                 term.tabs[term.c.x] = 1;
2429                 break;
2430         case 0x8d:   /* TODO: RI */
2431         case 0x8e:   /* TODO: SS2 */
2432         case 0x8f:   /* TODO: SS3 */
2433         case 0x98:   /* TODO: SOS */
2434                 break;
2435         case 0x9a:   /* DECID -- Identify Terminal */
2436                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2437                 break;
2438         case 0x9b:   /* TODO: CSI */
2439         case 0x9c:   /* TODO: ST */
2440                 break;
2441         case 0x90:   /* DCS -- Device Control String */
2442         case 0x9f:   /* APC -- Application Program Command */
2443         case 0x9e:   /* PM -- Privacy Message */
2444         case 0x9d:   /* OSC -- Operating System Command */
2445                 tstrsequence(ascii);
2446                 return;
2447         }
2448         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2449         term.esc &= ~(ESC_STR_END|ESC_STR);
2450         return;
2451 }
2452
2453 void
2454 tdectest(char c) {
2455         static char E[UTF_SIZ] = "E";
2456         int x, y;
2457
2458         if(c == '8') { /* DEC screen alignment test. */
2459                 for(x = 0; x < term.col; ++x) {
2460                         for(y = 0; y < term.row; ++y)
2461                                 tsetchar(E, &term.c.attr, x, y);
2462                 }
2463         }
2464 }
2465
2466 void
2467 tputc(char *c, int len) {
2468         uchar ascii;
2469         bool control;
2470         long unicodep;
2471         int width;
2472         Glyph *gp;
2473
2474         if(len == 1) {
2475                 width = 1;
2476                 unicodep = ascii = *c;
2477         } else {
2478                 utf8decode(c, &unicodep, UTF_SIZ);
2479                 width = wcwidth(unicodep);
2480                 control = ISCONTROLC1(unicodep);
2481                 ascii = unicodep;
2482         }
2483
2484         if(IS_SET(MODE_PRINT))
2485                 tprinter(c, len);
2486         control = ISCONTROL(unicodep);
2487
2488         /*
2489          * STR sequence must be checked before anything else
2490          * because it uses all following characters until it
2491          * receives a ESC, a SUB, a ST or any other C1 control
2492          * character.
2493          */
2494         if(term.esc & ESC_STR) {
2495                 if(width == 1 &&
2496                    (ascii == '\a' || ascii == 030 ||
2497                     ascii == 032  || ascii == 033 ||
2498                     ISCONTROLC1(unicodep))) {
2499                         term.esc &= ~(ESC_START|ESC_STR);
2500                         term.esc |= ESC_STR_END;
2501                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2502                         memmove(&strescseq.buf[strescseq.len], c, len);
2503                         strescseq.len += len;
2504                         return;
2505                 } else {
2506                 /*
2507                  * Here is a bug in terminals. If the user never sends
2508                  * some code to stop the str or esc command, then st
2509                  * will stop responding. But this is better than
2510                  * silently failing with unknown characters. At least
2511                  * then users will report back.
2512                  *
2513                  * In the case users ever get fixed, here is the code:
2514                  */
2515                 /*
2516                  * term.esc = 0;
2517                  * strhandle();
2518                  */
2519                         return;
2520                 }
2521         }
2522
2523         /*
2524          * Actions of control codes must be performed as soon they arrive
2525          * because they can be embedded inside a control sequence, and
2526          * they must not cause conflicts with sequences.
2527          */
2528         if(control) {
2529                 tcontrolcode(ascii);
2530                 /*
2531                  * control codes are not shown ever
2532                  */
2533                 return;
2534         } else if(term.esc & ESC_START) {
2535                 if(term.esc & ESC_CSI) {
2536                         csiescseq.buf[csiescseq.len++] = ascii;
2537                         if(BETWEEN(ascii, 0x40, 0x7E)
2538                                         || csiescseq.len >= \
2539                                         sizeof(csiescseq.buf)-1) {
2540                                 term.esc = 0;
2541                                 csiparse();
2542                                 csihandle();
2543                         }
2544                         return;
2545                 } else if(term.esc & ESC_ALTCHARSET) {
2546                         tdeftran(ascii);
2547                 } else if(term.esc & ESC_TEST) {
2548                         tdectest(ascii);
2549                 } else {
2550                         switch(ascii) {
2551                         case '[':
2552                                 term.esc |= ESC_CSI;
2553                                 return;
2554                         case '#':
2555                                 term.esc |= ESC_TEST;
2556                                 return;
2557                         case 'P': /* DCS -- Device Control String */
2558                         case '_': /* APC -- Application Program Command */
2559                         case '^': /* PM -- Privacy Message */
2560                         case ']': /* OSC -- Operating System Command */
2561                         case 'k': /* old title set compatibility */
2562                                 tstrsequence(ascii);
2563                                 return;
2564                         case '(': /* set primary charset G0 */
2565                         case ')': /* set secondary charset G1 */
2566                         case '*': /* set tertiary charset G2 */
2567                         case '+': /* set quaternary charset G3 */
2568                                 term.icharset = ascii - '(';
2569                                 term.esc |= ESC_ALTCHARSET;
2570                                 return;
2571                         case 'D': /* IND -- Linefeed */
2572                                 if(term.c.y == term.bot) {
2573                                         tscrollup(term.top, 1);
2574                                 } else {
2575                                         tmoveto(term.c.x, term.c.y+1);
2576                                 }
2577                                 break;
2578                         case 'E': /* NEL -- Next line */
2579                                 tnewline(1); /* always go to first col */
2580                                 break;
2581                         case 'H': /* HTS -- Horizontal tab stop */
2582                                 term.tabs[term.c.x] = 1;
2583                                 break;
2584                         case 'M': /* RI -- Reverse index */
2585                                 if(term.c.y == term.top) {
2586                                         tscrolldown(term.top, 1);
2587                                 } else {
2588                                         tmoveto(term.c.x, term.c.y-1);
2589                                 }
2590                                 break;
2591                         case 'Z': /* DECID -- Identify Terminal */
2592                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2593                                 break;
2594                         case 'c': /* RIS -- Reset to inital state */
2595                                 treset();
2596                                 xresettitle();
2597                                 xloadcols();
2598                                 break;
2599                         case '=': /* DECPAM -- Application keypad */
2600                                 term.mode |= MODE_APPKEYPAD;
2601                                 break;
2602                         case '>': /* DECPNM -- Normal keypad */
2603                                 term.mode &= ~MODE_APPKEYPAD;
2604                                 break;
2605                         case '7': /* DECSC -- Save Cursor */
2606                                 tcursor(CURSOR_SAVE);
2607                                 break;
2608                         case '8': /* DECRC -- Restore Cursor */
2609                                 tcursor(CURSOR_LOAD);
2610                                 break;
2611                         case '\\': /* ST -- String Terminator */
2612                                 if(term.esc & ESC_STR_END)
2613                                         strhandle();
2614                                 break;
2615                         default:
2616                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2617                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2618                                 break;
2619                         }
2620                 }
2621                 term.esc = 0;
2622                 /*
2623                  * All characters which form part of a sequence are not
2624                  * printed
2625                  */
2626                 return;
2627         }
2628         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2629                 selclear(NULL);
2630
2631         gp = &term.line[term.c.y][term.c.x];
2632         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2633                 gp->mode |= ATTR_WRAP;
2634                 tnewline(1);
2635         }
2636
2637         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2638                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2639
2640         if(term.c.x+width > term.col)
2641                 tnewline(1);
2642
2643         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2644
2645         if(width == 2) {
2646                 gp->mode |= ATTR_WIDE;
2647                 if(term.c.x+1 < term.col) {
2648                         gp[1].c[0] = '\0';
2649                         gp[1].mode = ATTR_WDUMMY;
2650                 }
2651         }
2652         if(term.c.x+width < term.col) {
2653                 tmoveto(term.c.x+width, term.c.y);
2654         } else {
2655                 term.c.state |= CURSOR_WRAPNEXT;
2656         }
2657 }
2658
2659 int
2660 tresize(int col, int row) {
2661         int i;
2662         int minrow = MIN(row, term.row);
2663         int mincol = MIN(col, term.col);
2664         int slide = term.c.y - row + 1;
2665         bool *bp;
2666         Line *orig;
2667         TCursor c;
2668
2669         if(col < 1 || row < 1)
2670                 return 0;
2671
2672         /* free unneeded rows */
2673         i = 0;
2674         if(slide > 0) {
2675                 /*
2676                  * slide screen to keep cursor where we expect it -
2677                  * tscrollup would work here, but we can optimize to
2678                  * memmove because we're freeing the earlier lines
2679                  */
2680                 for(/* i = 0 */; i < slide; i++) {
2681                         free(term.line[i]);
2682                         free(term.alt[i]);
2683                 }
2684                 memmove(term.line, term.line + slide, row * sizeof(Line));
2685                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2686         }
2687         for(i += row; i < term.row; i++) {
2688                 free(term.line[i]);
2689                 free(term.alt[i]);
2690         }
2691
2692         /* resize to new height */
2693         term.line = xrealloc(term.line, row * sizeof(Line));
2694         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2695         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2696         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2697
2698         /* resize each row to new width, zero-pad if needed */
2699         for(i = 0; i < minrow; i++) {
2700                 term.dirty[i] = 1;
2701                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2702                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2703         }
2704
2705         /* allocate any new rows */
2706         for(/* i == minrow */; i < row; i++) {
2707                 term.dirty[i] = 1;
2708                 term.line[i] = xmalloc(col * sizeof(Glyph));
2709                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2710         }
2711         if(col > term.col) {
2712                 bp = term.tabs + term.col;
2713
2714                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2715                 while(--bp > term.tabs && !*bp)
2716                         /* nothing */ ;
2717                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2718                         *bp = 1;
2719         }
2720         /* update terminal size */
2721         term.col = col;
2722         term.row = row;
2723         /* reset scrolling region */
2724         tsetscroll(0, row-1);
2725         /* make use of the LIMIT in tmoveto */
2726         tmoveto(term.c.x, term.c.y);
2727         /* Clearing both screens */
2728         orig = term.line;
2729         c = term.c;
2730         do {
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         } while(orig != term.line);
2740         term.c = c;
2741
2742         return (slide > 0);
2743 }
2744
2745 void
2746 xresize(int col, int row) {
2747         xw.tw = MAX(1, col * xw.cw);
2748         xw.th = MAX(1, row * xw.ch);
2749
2750         XFreePixmap(xw.dpy, xw.buf);
2751         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2752                         DefaultDepth(xw.dpy, xw.scr));
2753         XftDrawChange(xw.draw, xw.buf);
2754         xclear(0, 0, xw.w, xw.h);
2755 }
2756
2757 static inline ushort
2758 sixd_to_16bit(int x) {
2759         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2760 }
2761
2762 void
2763 xloadcols(void) {
2764         int i;
2765         XRenderColor color = { .alpha = 0xffff };
2766         static bool loaded;
2767         Color *cp;
2768
2769         if(loaded) {
2770                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2771                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2772         }
2773
2774         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2775         for(i = 0; i < LEN(colorname); i++) {
2776                 if(!colorname[i])
2777                         continue;
2778                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2779                         die("Could not allocate color '%s'\n", colorname[i]);
2780                 }
2781         }
2782
2783         /* load colors [16-231] ; same colors as xterm */
2784         for(i = 16; i < 6*6*6+16; i++) {
2785                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2786                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2787                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2788                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2789                         die("Could not allocate color %d\n", i);
2790         }
2791
2792         /* load colors [232-255] ; grayscale */
2793         for(; i < 256; i++) {
2794                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2795                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2796                         die("Could not allocate color %d\n", i);
2797         }
2798         loaded = true;
2799 }
2800
2801 int
2802 xsetcolorname(int x, const char *name) {
2803         XRenderColor color = { .alpha = 0xffff };
2804         Color ncolor;
2805
2806         if(!BETWEEN(x, 0, LEN(colorname)))
2807                 return 1;
2808
2809         if(!name) {
2810                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2811                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2812                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2813                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2814                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2815                                                 xw.cmap, &color, &ncolor)) {
2816                                 return 1;
2817                         }
2818
2819                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2820                         dc.col[x] = ncolor;
2821                         return 0;
2822                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2823                         color.red = color.green = color.blue = \
2824                                     0x0808 + 0x0a0a * (x - (16 + 216));
2825                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2826                                                 xw.cmap, &color, &ncolor)) {
2827                                 return 1;
2828                         }
2829
2830                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2831                         dc.col[x] = ncolor;
2832                         return 0;
2833                 } else { /* system colors */
2834                         name = colorname[x];
2835                 }
2836         }
2837         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2838                 return 1;
2839
2840         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2841         dc.col[x] = ncolor;
2842         return 0;
2843 }
2844
2845 void
2846 xtermclear(int col1, int row1, int col2, int row2) {
2847         XftDrawRect(xw.draw,
2848                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2849                         borderpx + col1 * xw.cw,
2850                         borderpx + row1 * xw.ch,
2851                         (col2-col1+1) * xw.cw,
2852                         (row2-row1+1) * xw.ch);
2853 }
2854
2855 /*
2856  * Absolute coordinates.
2857  */
2858 void
2859 xclear(int x1, int y1, int x2, int y2) {
2860         XftDrawRect(xw.draw,
2861                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2862                         x1, y1, x2-x1, y2-y1);
2863 }
2864
2865 void
2866 xhints(void) {
2867         XClassHint class = {opt_class ? opt_class : termname, termname};
2868         XWMHints wm = {.flags = InputHint, .input = 1};
2869         XSizeHints *sizeh = NULL;
2870
2871         sizeh = XAllocSizeHints();
2872
2873         sizeh->flags = PSize | PResizeInc | PBaseSize;
2874         sizeh->height = xw.h;
2875         sizeh->width = xw.w;
2876         sizeh->height_inc = xw.ch;
2877         sizeh->width_inc = xw.cw;
2878         sizeh->base_height = 2 * borderpx;
2879         sizeh->base_width = 2 * borderpx;
2880         if(xw.isfixed == True) {
2881                 sizeh->flags |= PMaxSize | PMinSize;
2882                 sizeh->min_width = sizeh->max_width = xw.w;
2883                 sizeh->min_height = sizeh->max_height = xw.h;
2884         }
2885         if(xw.gm & (XValue|YValue)) {
2886                 sizeh->flags |= USPosition | PWinGravity;
2887                 sizeh->x = xw.l;
2888                 sizeh->y = xw.t;
2889                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2890         }
2891
2892         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2893                         &class);
2894         XFree(sizeh);
2895 }
2896
2897 int
2898 xgeommasktogravity(int mask) {
2899         switch(mask & (XNegative|YNegative)) {
2900         case 0:
2901                 return NorthWestGravity;
2902         case XNegative:
2903                 return NorthEastGravity;
2904         case YNegative:
2905                 return SouthWestGravity;
2906         }
2907         return SouthEastGravity;
2908 }
2909
2910 int
2911 xloadfont(Font *f, FcPattern *pattern) {
2912         FcPattern *match;
2913         FcResult result;
2914
2915         match = FcFontMatch(NULL, pattern, &result);
2916         if(!match)
2917                 return 1;
2918
2919         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2920                 FcPatternDestroy(match);
2921                 return 1;
2922         }
2923
2924         f->set = NULL;
2925         f->pattern = FcPatternDuplicate(pattern);
2926
2927         f->ascent = f->match->ascent;
2928         f->descent = f->match->descent;
2929         f->lbearing = 0;
2930         f->rbearing = f->match->max_advance_width;
2931
2932         f->height = f->ascent + f->descent;
2933         f->width = f->lbearing + f->rbearing;
2934
2935         return 0;
2936 }
2937
2938 void
2939 xloadfonts(char *fontstr, double fontsize) {
2940         FcPattern *pattern;
2941         FcResult r_sz, r_psz;
2942         double fontval;
2943         float ceilf(float);
2944
2945         if(fontstr[0] == '-') {
2946                 pattern = XftXlfdParse(fontstr, False, False);
2947         } else {
2948                 pattern = FcNameParse((FcChar8 *)fontstr);
2949         }
2950
2951         if(!pattern)
2952                 die("st: can't open font %s\n", fontstr);
2953
2954         if(fontsize > 0) {
2955                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2956                 FcPatternDel(pattern, FC_SIZE);
2957                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2958                 usedfontsize = fontsize;
2959         } else {
2960                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2961                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2962                 if(r_psz == FcResultMatch) {
2963                         usedfontsize = fontval;
2964                 } else if(r_sz == FcResultMatch) {
2965                         usedfontsize = -1;
2966                 } else {
2967                         /*
2968                          * Default font size is 12, if none given. This is to
2969                          * have a known usedfontsize value.
2970                          */
2971                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2972                         usedfontsize = 12;
2973                 }
2974         }
2975
2976         FcConfigSubstitute(0, pattern, FcMatchPattern);
2977         FcDefaultSubstitute(pattern);
2978
2979         if(xloadfont(&dc.font, pattern))
2980                 die("st: can't open font %s\n", fontstr);
2981
2982         if(usedfontsize < 0) {
2983                 FcPatternGetDouble(dc.font.match->pattern,
2984                                    FC_PIXEL_SIZE, 0, &fontval);
2985                 usedfontsize = fontval;
2986         }
2987
2988         /* Setting character width and height. */
2989         xw.cw = ceilf(dc.font.width * cwscale);
2990         xw.ch = ceilf(dc.font.height * chscale);
2991
2992         FcPatternDel(pattern, FC_SLANT);
2993         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2994         if(xloadfont(&dc.ifont, pattern))
2995                 die("st: can't open font %s\n", fontstr);
2996
2997         FcPatternDel(pattern, FC_WEIGHT);
2998         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2999         if(xloadfont(&dc.ibfont, pattern))
3000                 die("st: can't open font %s\n", fontstr);
3001
3002         FcPatternDel(pattern, FC_SLANT);
3003         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3004         if(xloadfont(&dc.bfont, pattern))
3005                 die("st: can't open font %s\n", fontstr);
3006
3007         FcPatternDestroy(pattern);
3008 }
3009
3010 int
3011 xloadfontset(Font *f) {
3012         FcResult result;
3013
3014         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
3015                 return 1;
3016         return 0;
3017 }
3018
3019 void
3020 xunloadfont(Font *f) {
3021         XftFontClose(xw.dpy, f->match);
3022         FcPatternDestroy(f->pattern);
3023         if(f->set)
3024                 FcFontSetDestroy(f->set);
3025 }
3026
3027 void
3028 xunloadfonts(void) {
3029         /* Free the loaded fonts in the font cache.  */
3030         while(frclen > 0)
3031                 XftFontClose(xw.dpy, frc[--frclen].font);
3032
3033         xunloadfont(&dc.font);
3034         xunloadfont(&dc.bfont);
3035         xunloadfont(&dc.ifont);
3036         xunloadfont(&dc.ibfont);
3037 }
3038
3039 void
3040 xzoom(const Arg *arg) {
3041         xunloadfonts();
3042         xloadfonts(usedfont, usedfontsize + arg->i);
3043         cresize(0, 0);
3044         redraw(0);
3045         xhints();
3046 }
3047
3048 void
3049 xinit(void) {
3050         XGCValues gcvalues;
3051         Cursor cursor;
3052         Window parent;
3053         pid_t thispid = getpid();
3054
3055         if(!(xw.dpy = XOpenDisplay(NULL)))
3056                 die("Can't open display\n");
3057         xw.scr = XDefaultScreen(xw.dpy);
3058         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3059
3060         /* font */
3061         if(!FcInit())
3062                 die("Could not init fontconfig.\n");
3063
3064         usedfont = (opt_font == NULL)? font : opt_font;
3065         xloadfonts(usedfont, 0);
3066
3067         /* colors */
3068         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3069         xloadcols();
3070
3071         /* adjust fixed window geometry */
3072         xw.w = 2 * borderpx + term.col * xw.cw;
3073         xw.h = 2 * borderpx + term.row * xw.ch;
3074         if(xw.gm & XNegative)
3075                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3076         if(xw.gm & YNegative)
3077                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3078
3079         /* Events */
3080         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3081         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3082         xw.attrs.bit_gravity = NorthWestGravity;
3083         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3084                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3085                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3086         xw.attrs.colormap = xw.cmap;
3087
3088         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3089                         XRootWindow(xw.dpy, xw.scr);
3090         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3091                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3092                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3093                         | CWEventMask | CWColormap, &xw.attrs);
3094
3095         memset(&gcvalues, 0, sizeof(gcvalues));
3096         gcvalues.graphics_exposures = False;
3097         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3098                         &gcvalues);
3099         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3100                         DefaultDepth(xw.dpy, xw.scr));
3101         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3102         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3103
3104         /* Xft rendering context */
3105         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3106
3107         /* input methods */
3108         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3109                 XSetLocaleModifiers("@im=local");
3110                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3111                         XSetLocaleModifiers("@im=");
3112                         if((xw.xim = XOpenIM(xw.dpy,
3113                                         NULL, NULL, NULL)) == NULL) {
3114                                 die("XOpenIM failed. Could not open input"
3115                                         " device.\n");
3116                         }
3117                 }
3118         }
3119         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3120                                            | XIMStatusNothing, XNClientWindow, xw.win,
3121                                            XNFocusWindow, xw.win, NULL);
3122         if(xw.xic == NULL)
3123                 die("XCreateIC failed. Could not obtain input method.\n");
3124
3125         /* white cursor, black outline */
3126         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3127         XDefineCursor(xw.dpy, xw.win, cursor);
3128         XRecolorCursor(xw.dpy, cursor,
3129                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3130                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3131
3132         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3133         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3134         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3135         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3136
3137         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3138         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3139                         PropModeReplace, (uchar *)&thispid, 1);
3140
3141         xresettitle();
3142         XMapWindow(xw.dpy, xw.win);
3143         xhints();
3144         XSync(xw.dpy, False);
3145 }
3146
3147 void
3148 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3149         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3150             width = charlen * xw.cw, xp, i;
3151         int frcflags;
3152         int u8fl, u8fblen, u8cblen, doesexist;
3153         char *u8c, *u8fs;
3154         long unicodep;
3155         Font *font = &dc.font;
3156         FcResult fcres;
3157         FcPattern *fcpattern, *fontpattern;
3158         FcFontSet *fcsets[] = { NULL };
3159         FcCharSet *fccharset;
3160         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3161         XRenderColor colfg, colbg;
3162         XRectangle r;
3163         int oneatatime;
3164
3165         frcflags = FRC_NORMAL;
3166
3167         if(base.mode & ATTR_ITALIC) {
3168                 if(base.fg == defaultfg)
3169                         base.fg = defaultitalic;
3170                 font = &dc.ifont;
3171                 frcflags = FRC_ITALIC;
3172         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3173                 if(base.fg == defaultfg)
3174                         base.fg = defaultitalic;
3175                 font = &dc.ibfont;
3176                 frcflags = FRC_ITALICBOLD;
3177         } else if(base.mode & ATTR_UNDERLINE) {
3178                 if(base.fg == defaultfg)
3179                         base.fg = defaultunderline;
3180         }
3181
3182         if(IS_TRUECOL(base.fg)) {
3183                 colfg.alpha = 0xffff;
3184                 colfg.red = TRUERED(base.fg);
3185                 colfg.green = TRUEGREEN(base.fg);
3186                 colfg.blue = TRUEBLUE(base.fg);
3187                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3188                 fg = &truefg;
3189         } else {
3190                 fg = &dc.col[base.fg];
3191         }
3192
3193         if(IS_TRUECOL(base.bg)) {
3194                 colbg.alpha = 0xffff;
3195                 colbg.green = TRUEGREEN(base.bg);
3196                 colbg.red = TRUERED(base.bg);
3197                 colbg.blue = TRUEBLUE(base.bg);
3198                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3199                 bg = &truebg;
3200         } else {
3201                 bg = &dc.col[base.bg];
3202         }
3203
3204         if(base.mode & ATTR_BOLD) {
3205                 /*
3206                  * change basic system colors [0-7]
3207                  * to bright system colors [8-15]
3208                  */
3209                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3210                         fg = &dc.col[base.fg + 8];
3211
3212                 if(base.mode & ATTR_ITALIC) {
3213                         font = &dc.ibfont;
3214                         frcflags = FRC_ITALICBOLD;
3215                 } else {
3216                         font = &dc.bfont;
3217                         frcflags = FRC_BOLD;
3218                 }
3219         }
3220
3221         if(IS_SET(MODE_REVERSE)) {
3222                 if(fg == &dc.col[defaultfg]) {
3223                         fg = &dc.col[defaultbg];
3224                 } else {
3225                         colfg.red = ~fg->color.red;
3226                         colfg.green = ~fg->color.green;
3227                         colfg.blue = ~fg->color.blue;
3228                         colfg.alpha = fg->color.alpha;
3229                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3230                                         &revfg);
3231                         fg = &revfg;
3232                 }
3233
3234                 if(bg == &dc.col[defaultbg]) {
3235                         bg = &dc.col[defaultfg];
3236                 } else {
3237                         colbg.red = ~bg->color.red;
3238                         colbg.green = ~bg->color.green;
3239                         colbg.blue = ~bg->color.blue;
3240                         colbg.alpha = bg->color.alpha;
3241                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3242                                         &revbg);
3243                         bg = &revbg;
3244                 }
3245         }
3246
3247         if(base.mode & ATTR_REVERSE) {
3248                 temp = fg;
3249                 fg = bg;
3250                 bg = temp;
3251         }
3252
3253         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3254                 colfg.red = fg->color.red / 2;
3255                 colfg.green = fg->color.green / 2;
3256                 colfg.blue = fg->color.blue / 2;
3257                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3258                 fg = &revfg;
3259         }
3260
3261         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3262                 fg = bg;
3263
3264         if(base.mode & ATTR_INVISIBLE)
3265                 fg = bg;
3266
3267         /* Intelligent cleaning up of the borders. */
3268         if(x == 0) {
3269                 xclear(0, (y == 0)? 0 : winy, borderpx,
3270                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3271         }
3272         if(x + charlen >= term.col) {
3273                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3274                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3275         }
3276         if(y == 0)
3277                 xclear(winx, 0, winx + width, borderpx);
3278         if(y == term.row-1)
3279                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3280
3281         /* Clean up the region we want to draw to. */
3282         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3283
3284         /* Set the clip region because Xft is sometimes dirty. */
3285         r.x = 0;
3286         r.y = 0;
3287         r.height = xw.ch;
3288         r.width = width;
3289         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3290
3291         for(xp = winx; bytelen > 0;) {
3292                 /*
3293                  * Search for the range in the to be printed string of glyphs
3294                  * that are in the main font. Then print that range. If
3295                  * some glyph is found that is not in the font, do the
3296                  * fallback dance.
3297                  */
3298                 u8fs = s;
3299                 u8fblen = 0;
3300                 u8fl = 0;
3301                 oneatatime = font->width != xw.cw;
3302                 for(;;) {
3303                         u8c = s;
3304                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3305                         s += u8cblen;
3306                         bytelen -= u8cblen;
3307
3308                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3309                         if(doesexist) {
3310                                         u8fl++;
3311                                         u8fblen += u8cblen;
3312                                         if(!oneatatime && bytelen > 0)
3313                                                         continue;
3314                         }
3315
3316                         if(u8fl > 0) {
3317                                 XftDrawStringUtf8(xw.draw, fg,
3318                                                 font->match, xp,
3319                                                 winy + font->ascent,
3320                                                 (FcChar8 *)u8fs,
3321                                                 u8fblen);
3322                                 xp += xw.cw * u8fl;
3323                         }
3324                         break;
3325                 }
3326                 if(doesexist) {
3327                         if(oneatatime)
3328                                 continue;
3329                         break;
3330                 }
3331
3332                 /* Search the font cache. */
3333                 for(i = 0; i < frclen; i++) {
3334                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3335                                         && frc[i].flags == frcflags) {
3336                                 break;
3337                         }
3338                 }
3339
3340                 /* Nothing was found. */
3341                 if(i >= frclen) {
3342                         if(!font->set)
3343                                 xloadfontset(font);
3344                         fcsets[0] = font->set;
3345
3346                         /*
3347                          * Nothing was found in the cache. Now use
3348                          * some dozen of Fontconfig calls to get the
3349                          * font for one single character.
3350                          *
3351                          * Xft and fontconfig are design failures.
3352                          */
3353                         fcpattern = FcPatternDuplicate(font->pattern);
3354                         fccharset = FcCharSetCreate();
3355
3356                         FcCharSetAddChar(fccharset, unicodep);
3357                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3358                                         fccharset);
3359                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3360                                         FcTrue);
3361
3362                         FcConfigSubstitute(0, fcpattern,
3363                                         FcMatchPattern);
3364                         FcDefaultSubstitute(fcpattern);
3365
3366                         fontpattern = FcFontSetMatch(0, fcsets,
3367                                         FcTrue, fcpattern, &fcres);
3368
3369                         /*
3370                          * Overwrite or create the new cache entry.
3371                          */
3372                         if(frclen >= LEN(frc)) {
3373                                 frclen = LEN(frc) - 1;
3374                                 XftFontClose(xw.dpy, frc[frclen].font);
3375                         }
3376
3377                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3378                                         fontpattern);
3379                         frc[frclen].flags = frcflags;
3380
3381                         i = frclen;
3382                         frclen++;
3383
3384                         FcPatternDestroy(fcpattern);
3385                         FcCharSetDestroy(fccharset);
3386                 }
3387
3388                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3389                                 xp, winy + frc[i].font->ascent,
3390                                 (FcChar8 *)u8c, u8cblen);
3391
3392                 xp += xw.cw * wcwidth(unicodep);
3393         }
3394
3395         /*
3396          * This is how the loop above actually should be. Why does the
3397          * application have to care about font details?
3398          *
3399          * I have to repeat: Xft and Fontconfig are design failures.
3400          */
3401         /*
3402         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3403                         winy + font->ascent, (FcChar8 *)s, bytelen);
3404         */
3405
3406         if(base.mode & ATTR_UNDERLINE) {
3407                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3408                                 width, 1);
3409         }
3410
3411         if(base.mode & ATTR_STRUCK) {
3412                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3413                                 width, 1);
3414         }
3415
3416         /* Reset clip to none. */
3417         XftDrawSetClip(xw.draw, 0);
3418 }
3419
3420 void
3421 xdrawcursor(void) {
3422         static int oldx = 0, oldy = 0;
3423         int sl, width, curx;
3424         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3425
3426         LIMIT(oldx, 0, term.col-1);
3427         LIMIT(oldy, 0, term.row-1);
3428
3429         curx = term.c.x;
3430
3431         /* adjust position if in dummy */
3432         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3433                 oldx--;
3434         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3435                 curx--;
3436
3437         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3438
3439         /* remove the old cursor */
3440         sl = utf8len(term.line[oldy][oldx].c);
3441         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3442         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3443                         oldy, width, sl);
3444
3445         /* draw the new one */
3446         if(!(IS_SET(MODE_HIDE))) {
3447                 if(xw.state & WIN_FOCUSED) {
3448                         if(IS_SET(MODE_REVERSE)) {
3449                                 g.mode |= ATTR_REVERSE;
3450                                 g.fg = defaultcs;
3451                                 g.bg = defaultfg;
3452                         }
3453
3454                         sl = utf8len(g.c);
3455                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3456                                 ? 2 : 1;
3457                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3458                 } else {
3459                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3460                                         borderpx + curx * xw.cw,
3461                                         borderpx + term.c.y * xw.ch,
3462                                         xw.cw - 1, 1);
3463                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3464                                         borderpx + curx * xw.cw,
3465                                         borderpx + term.c.y * xw.ch,
3466                                         1, xw.ch - 1);
3467                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3468                                         borderpx + (curx + 1) * xw.cw - 1,
3469                                         borderpx + term.c.y * xw.ch,
3470                                         1, xw.ch - 1);
3471                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3472                                         borderpx + curx * xw.cw,
3473                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3474                                         xw.cw, 1);
3475                 }
3476                 oldx = curx, oldy = term.c.y;
3477         }
3478 }
3479
3480
3481 void
3482 xsettitle(char *p) {
3483         XTextProperty prop;
3484
3485         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3486                         &prop);
3487         XSetWMName(xw.dpy, xw.win, &prop);
3488         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3489         XFree(prop.value);
3490 }
3491
3492 void
3493 xresettitle(void) {
3494         xsettitle(opt_title ? opt_title : "st");
3495 }
3496
3497 void
3498 redraw(int timeout) {
3499         struct timespec tv = {0, timeout * 1000};
3500
3501         tfulldirt();
3502         draw();
3503
3504         if(timeout > 0) {
3505                 nanosleep(&tv, NULL);
3506                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3507         }
3508 }
3509
3510 void
3511 draw(void) {
3512         drawregion(0, 0, term.col, term.row);
3513         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3514                         xw.h, 0, 0);
3515         XSetForeground(xw.dpy, dc.gc,
3516                         dc.col[IS_SET(MODE_REVERSE)?
3517                                 defaultfg : defaultbg].pixel);
3518 }
3519
3520 void
3521 drawregion(int x1, int y1, int x2, int y2) {
3522         int ic, ib, x, y, ox, sl;
3523         Glyph base, new;
3524         char buf[DRAW_BUF_SIZ];
3525         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3526         long unicodep;
3527
3528         if(!(xw.state & WIN_VISIBLE))
3529                 return;
3530
3531         for(y = y1; y < y2; y++) {
3532                 if(!term.dirty[y])
3533                         continue;
3534
3535                 xtermclear(0, y, term.col, y);
3536                 term.dirty[y] = 0;
3537                 base = term.line[y][0];
3538                 ic = ib = ox = 0;
3539                 for(x = x1; x < x2; x++) {
3540                         new = term.line[y][x];
3541                         if(new.mode == ATTR_WDUMMY)
3542                                 continue;
3543                         if(ena_sel && selected(x, y))
3544                                 new.mode ^= ATTR_REVERSE;
3545                         if(ib > 0 && (ATTRCMP(base, new)
3546                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3547                                 xdraws(buf, base, ox, y, ic, ib);
3548                                 ic = ib = 0;
3549                         }
3550                         if(ib == 0) {
3551                                 ox = x;
3552                                 base = new;
3553                         }
3554
3555                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3556                         memcpy(buf+ib, new.c, sl);
3557                         ib += sl;
3558                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3559                 }
3560                 if(ib > 0)
3561                         xdraws(buf, base, ox, y, ic, ib);
3562         }
3563         xdrawcursor();
3564 }
3565
3566 void
3567 expose(XEvent *ev) {
3568         XExposeEvent *e = &ev->xexpose;
3569
3570         if(xw.state & WIN_REDRAW) {
3571                 if(!e->count)
3572                         xw.state &= ~WIN_REDRAW;
3573         }
3574         redraw(0);
3575 }
3576
3577 void
3578 visibility(XEvent *ev) {
3579         XVisibilityEvent *e = &ev->xvisibility;
3580
3581         if(e->state == VisibilityFullyObscured) {
3582                 xw.state &= ~WIN_VISIBLE;
3583         } else if(!(xw.state & WIN_VISIBLE)) {
3584                 /* need a full redraw for next Expose, not just a buf copy */
3585                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3586         }
3587 }
3588
3589 void
3590 unmap(XEvent *ev) {
3591         xw.state &= ~WIN_VISIBLE;
3592 }
3593
3594 void
3595 xsetpointermotion(int set) {
3596         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3597         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3598 }
3599
3600 void
3601 xseturgency(int add) {
3602         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3603
3604         MODBIT(h->flags, add, XUrgencyHint);
3605         XSetWMHints(xw.dpy, xw.win, h);
3606         XFree(h);
3607 }
3608
3609 void
3610 focus(XEvent *ev) {
3611         XFocusChangeEvent *e = &ev->xfocus;
3612
3613         if(e->mode == NotifyGrab)
3614                 return;
3615
3616         if(ev->type == FocusIn) {
3617                 XSetICFocus(xw.xic);
3618                 xw.state |= WIN_FOCUSED;
3619                 xseturgency(0);
3620                 if(IS_SET(MODE_FOCUS))
3621                         ttywrite("\033[I", 3);
3622         } else {
3623                 XUnsetICFocus(xw.xic);
3624                 xw.state &= ~WIN_FOCUSED;
3625                 if(IS_SET(MODE_FOCUS))
3626                         ttywrite("\033[O", 3);
3627         }
3628 }
3629
3630 static inline bool
3631 match(uint mask, uint state) {
3632         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3633 }
3634
3635 void
3636 numlock(const Arg *dummy) {
3637         term.numlock ^= 1;
3638 }
3639
3640 char*
3641 kmap(KeySym k, uint state) {
3642         Key *kp;
3643         int i;
3644
3645         /* Check for mapped keys out of X11 function keys. */
3646         for(i = 0; i < LEN(mappedkeys); i++) {
3647                 if(mappedkeys[i] == k)
3648                         break;
3649         }
3650         if(i == LEN(mappedkeys)) {
3651                 if((k & 0xFFFF) < 0xFD00)
3652                         return NULL;
3653         }
3654
3655         for(kp = key; kp < key + LEN(key); kp++) {
3656                 if(kp->k != k)
3657                         continue;
3658
3659                 if(!match(kp->mask, state))
3660                         continue;
3661
3662                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3663                         continue;
3664                 if(term.numlock && kp->appkey == 2)
3665                         continue;
3666
3667                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3668                         continue;
3669
3670                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3671                         continue;
3672
3673                 return kp->s;
3674         }
3675
3676         return NULL;
3677 }
3678
3679 void
3680 kpress(XEvent *ev) {
3681         XKeyEvent *e = &ev->xkey;
3682         KeySym ksym;
3683         char buf[32], *customkey;
3684         int len;
3685         long c;
3686         Status status;
3687         Shortcut *bp;
3688
3689         if(IS_SET(MODE_KBDLOCK))
3690                 return;
3691
3692         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3693         /* 1. shortcuts */
3694         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3695                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3696                         bp->func(&(bp->arg));
3697                         return;
3698                 }
3699         }
3700
3701         /* 2. custom keys from config.h */
3702         if((customkey = kmap(ksym, e->state))) {
3703                 ttysend(customkey, strlen(customkey));
3704                 return;
3705         }
3706
3707         /* 3. composed string from input method */
3708         if(len == 0)
3709                 return;
3710         if(len == 1 && e->state & Mod1Mask) {
3711                 if(IS_SET(MODE_8BIT)) {
3712                         if(*buf < 0177) {
3713                                 c = *buf | 0x80;
3714                                 len = utf8encode(c, buf, UTF_SIZ);
3715                         }
3716                 } else {
3717                         buf[1] = buf[0];
3718                         buf[0] = '\033';
3719                         len = 2;
3720                 }
3721         }
3722         ttysend(buf, len);
3723 }
3724
3725
3726 void
3727 cmessage(XEvent *e) {
3728         /*
3729          * See xembed specs
3730          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3731          */
3732         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3733                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3734                         xw.state |= WIN_FOCUSED;
3735                         xseturgency(0);
3736                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3737                         xw.state &= ~WIN_FOCUSED;
3738                 }
3739         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3740                 /* Send SIGHUP to shell */
3741                 kill(pid, SIGHUP);
3742                 exit(EXIT_SUCCESS);
3743         }
3744 }
3745
3746 void
3747 cresize(int width, int height) {
3748         int col, row;
3749
3750         if(width != 0)
3751                 xw.w = width;
3752         if(height != 0)
3753                 xw.h = height;
3754
3755         col = (xw.w - 2 * borderpx) / xw.cw;
3756         row = (xw.h - 2 * borderpx) / xw.ch;
3757
3758         tresize(col, row);
3759         xresize(col, row);
3760         ttyresize();
3761 }
3762
3763 void
3764 resize(XEvent *e) {
3765         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3766                 return;
3767
3768         cresize(e->xconfigure.width, e->xconfigure.height);
3769 }
3770
3771 void
3772 run(void) {
3773         XEvent ev;
3774         int w = xw.w, h = xw.h;
3775         fd_set rfd;
3776         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3777         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3778         long deltatime;
3779
3780         /* Waiting for window mapping */
3781         while(1) {
3782                 XNextEvent(xw.dpy, &ev);
3783                 if(XFilterEvent(&ev, None))
3784                         continue;
3785                 if(ev.type == ConfigureNotify) {
3786                         w = ev.xconfigure.width;
3787                         h = ev.xconfigure.height;
3788                 } else if(ev.type == MapNotify) {
3789                         break;
3790                 }
3791         }
3792
3793         ttynew();
3794         cresize(w, h);
3795
3796         clock_gettime(CLOCK_MONOTONIC, &last);
3797         lastblink = last;
3798
3799         for(xev = actionfps;;) {
3800                 FD_ZERO(&rfd);
3801                 FD_SET(cmdfd, &rfd);
3802                 FD_SET(xfd, &rfd);
3803
3804                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3805                         if(errno == EINTR)
3806                                 continue;
3807                         die("select failed: %s\n", strerror(errno));
3808                 }
3809                 if(FD_ISSET(cmdfd, &rfd)) {
3810                         ttyread();
3811                         if(blinktimeout) {
3812                                 blinkset = tattrset(ATTR_BLINK);
3813                                 if(!blinkset)
3814                                         MODBIT(term.mode, 0, MODE_BLINK);
3815                         }
3816                 }
3817
3818                 if(FD_ISSET(xfd, &rfd))
3819                         xev = actionfps;
3820
3821                 clock_gettime(CLOCK_MONOTONIC, &now);
3822                 drawtimeout.tv_sec = 0;
3823                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3824                 tv = &drawtimeout;
3825
3826                 dodraw = 0;
3827                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3828                         tsetdirtattr(ATTR_BLINK);
3829                         term.mode ^= MODE_BLINK;
3830                         lastblink = now;
3831                         dodraw = 1;
3832                 }
3833                 deltatime = TIMEDIFF(now, last);
3834                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3835                                 || deltatime < 0) {
3836                         dodraw = 1;
3837                         last = now;
3838                 }
3839
3840                 if(dodraw) {
3841                         while(XPending(xw.dpy)) {
3842                                 XNextEvent(xw.dpy, &ev);
3843                                 if(XFilterEvent(&ev, None))
3844                                         continue;
3845                                 if(handler[ev.type])
3846                                         (handler[ev.type])(&ev);
3847                         }
3848
3849                         draw();
3850                         XFlush(xw.dpy);
3851
3852                         if(xev && !FD_ISSET(xfd, &rfd))
3853                                 xev--;
3854                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3855                                 if(blinkset) {
3856                                         if(TIMEDIFF(now, lastblink) \
3857                                                         > blinktimeout) {
3858                                                 drawtimeout.tv_nsec = 1000;
3859                                         } else {
3860                                                 drawtimeout.tv_nsec = (1E6 * \
3861                                                         (blinktimeout - \
3862                                                         TIMEDIFF(now,
3863                                                                 lastblink)));
3864                                         }
3865                                 } else {
3866                                         tv = NULL;
3867                                 }
3868                         }
3869                 }
3870         }
3871 }
3872
3873 void
3874 usage(void) {
3875         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3876         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3877         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3878 }
3879
3880 int
3881 main(int argc, char *argv[]) {
3882         char *titles;
3883         uint cols = 80, rows = 24;
3884
3885         xw.l = xw.t = 0;
3886         xw.isfixed = False;
3887
3888         ARGBEGIN {
3889         case 'a':
3890                 allowaltscreen = false;
3891                 break;
3892         case 'c':
3893                 opt_class = EARGF(usage());
3894                 break;
3895         case 'e':
3896                 /* eat all remaining arguments */
3897                 if(argc > 1) {
3898                         opt_cmd = &argv[1];
3899                         if(argv[1] != NULL && opt_title == NULL) {
3900                                 titles = xstrdup(argv[1]);
3901                                 opt_title = basename(titles);
3902                         }
3903                 }
3904                 goto run;
3905         case 'f':
3906                 opt_font = EARGF(usage());
3907                 break;
3908         case 'g':
3909                 xw.gm = XParseGeometry(EARGF(usage()),
3910                                 &xw.l, &xw.t, &cols, &rows);
3911                 break;
3912         case 'i':
3913                 xw.isfixed = True;
3914                 break;
3915         case 'o':
3916                 opt_io = EARGF(usage());
3917                 break;
3918         case 't':
3919                 opt_title = EARGF(usage());
3920                 break;
3921         case 'w':
3922                 opt_embed = EARGF(usage());
3923                 break;
3924         case 'v':
3925         default:
3926                 usage();
3927         } ARGEND;
3928
3929 run:
3930         setlocale(LC_CTYPE, "");
3931         XSetLocaleModifiers("");
3932         tnew(cols? cols : 1, rows? rows : 1);
3933         xinit();
3934         selinit();
3935         run();
3936
3937         return 0;
3938 }
3939