st.c

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