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                 str = NULL;
 927         } else {
 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         }
 979         return str;
 980 }
 981
 982 void
 983 selcopy(void) {
 984         xsetsel(getsel());
 985 }
 986
 987 void
 988 selnotify(XEvent *e) {
 989         ulong nitems, ofs, rem;
 990         int format;
 991         uchar *data, *last, *repl;
 992         Atom type;
 993
 994         ofs = 0;
 995         do {
 996                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 997                                         False, AnyPropertyType, &type, &format,
 998                                         &nitems, &rem, &data)) {
 999                         fprintf(stderr, "Clipboard allocation failed\n");
1000                         return;
1001                 }
1002
1003                 /*
1004                  * As seen in getsel:
1005                  * Line endings are inconsistent in the terminal and GUI world
1006                  * copy and pasting. When receiving some selection data,
1007                  * replace all '\n' with '\r'.
1008                  * FIXME: Fix the computer world.
1009                  */
1010                 repl = data;
1011                 last = data + nitems * format / 8;
1012                 while((repl = memchr(repl, '\n', last - repl))) {
1013                         *repl++ = '\r';
1014                 }
1015
1016                 if(IS_SET(MODE_BRCKTPASTE))
1017                         ttywrite("\033[200~", 6);
1018                 ttysend((char *)data, nitems * format / 8);
1019                 if(IS_SET(MODE_BRCKTPASTE))
1020                         ttywrite("\033[201~", 6);
1021                 XFree(data);
1022                 /* number of 32-bit chunks returned */
1023                 ofs += nitems * format / 32;
1024         } while(rem > 0);
1025 }
1026
1027 void
1028 selpaste(const Arg *dummy) {
1029         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1030                         xw.win, CurrentTime);
1031 }
1032
1033 void
1034 clippaste(const Arg *dummy) {
1035         Atom clipboard;
1036
1037         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1038         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1039                         xw.win, CurrentTime);
1040 }
1041
1042 void
1043 selclear(XEvent *e) {
1044         if(sel.ob.x == -1)
1045                 return;
1046         sel.ob.x = -1;
1047         tsetdirt(sel.nb.y, sel.ne.y);
1048 }
1049
1050 void
1051 selrequest(XEvent *e) {
1052         XSelectionRequestEvent *xsre;
1053         XSelectionEvent xev;
1054         Atom xa_targets, string;
1055
1056         xsre = (XSelectionRequestEvent *) e;
1057         xev.type = SelectionNotify;
1058         xev.requestor = xsre->requestor;
1059         xev.selection = xsre->selection;
1060         xev.target = xsre->target;
1061         xev.time = xsre->time;
1062         /* reject */
1063         xev.property = None;
1064
1065         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1066         if(xsre->target == xa_targets) {
1067                 /* respond with the supported type */
1068                 string = sel.xtarget;
1069                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1070                                 XA_ATOM, 32, PropModeReplace,
1071                                 (uchar *) &string, 1);
1072                 xev.property = xsre->property;
1073         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1074                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1075                                 xsre->target, 8, PropModeReplace,
1076                                 (uchar *) sel.clip, strlen(sel.clip));
1077                 xev.property = xsre->property;
1078         }
1079
1080         /* all done, send a notification to the listener */
1081         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1082                 fprintf(stderr, "Error sending SelectionNotify event\n");
1083 }
1084
1085 void
1086 xsetsel(char *str) {
1087         /* register the selection for both the clipboard and the primary */
1088         Atom clipboard;
1089
1090         free(sel.clip);
1091         sel.clip = str;
1092
1093         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1094
1095         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1096         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1097 }
1098
1099 void
1100 brelease(XEvent *e) {
1101         if(IS_SET(MODE_MOUSE)) {
1102                 mousereport(e);
1103                 return;
1104         }
1105
1106         if(e->xbutton.button == Button2) {
1107                 selpaste(NULL);
1108         } else if(e->xbutton.button == Button1) {
1109                 if(sel.mode < 2) {
1110                         selclear(NULL);
1111                 } else {
1112                         getbuttoninfo(e);
1113                         selcopy();
1114                 }
1115                 sel.mode = 0;
1116                 tsetdirt(sel.nb.y, sel.ne.y);
1117         }
1118 }
1119
1120 void
1121 bmotion(XEvent *e) {
1122         int oldey, oldex, oldsby, oldsey;
1123
1124         if(IS_SET(MODE_MOUSE)) {
1125                 mousereport(e);
1126                 return;
1127         }
1128
1129         if(!sel.mode)
1130                 return;
1131
1132         sel.mode++;
1133         oldey = sel.oe.y;
1134         oldex = sel.oe.x;
1135         oldsby = sel.nb.y;
1136         oldsey = sel.ne.y;
1137         getbuttoninfo(e);
1138
1139         if(oldey != sel.oe.y || oldex != sel.oe.x)
1140                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1141 }
1142
1143 void
1144 die(const char *errstr, ...) {
1145         va_list ap;
1146
1147         va_start(ap, errstr);
1148         vfprintf(stderr, errstr, ap);
1149         va_end(ap);
1150         exit(EXIT_FAILURE);
1151 }
1152
1153 void
1154 execsh(void) {
1155         char **args;
1156         char *envshell = getenv("SHELL");
1157         const struct passwd *pass = getpwuid(getuid());
1158         char buf[sizeof(long) * 8 + 1];
1159
1160         unsetenv("COLUMNS");
1161         unsetenv("LINES");
1162         unsetenv("TERMCAP");
1163
1164         if(pass) {
1165                 setenv("LOGNAME", pass->pw_name, 1);
1166                 setenv("USER", pass->pw_name, 1);
1167                 setenv("SHELL", pass->pw_shell, 0);
1168                 setenv("HOME", pass->pw_dir, 0);
1169         }
1170
1171         snprintf(buf, sizeof(buf), "%lu", xw.win);
1172         setenv("WINDOWID", buf, 1);
1173
1174         signal(SIGCHLD, SIG_DFL);
1175         signal(SIGHUP, SIG_DFL);
1176         signal(SIGINT, SIG_DFL);
1177         signal(SIGQUIT, SIG_DFL);
1178         signal(SIGTERM, SIG_DFL);
1179         signal(SIGALRM, SIG_DFL);
1180
1181         DEFAULT(envshell, shell);
1182         setenv("TERM", termname, 1);
1183         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1184         execvp(args[0], args);
1185         exit(EXIT_FAILURE);
1186 }
1187
1188 void
1189 sigchld(int a) {
1190         int stat = 0;
1191
1192         if(waitpid(pid, &stat, 0) < 0)
1193                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1194
1195         if(WIFEXITED(stat)) {
1196                 exit(WEXITSTATUS(stat));
1197         } else {
1198                 exit(EXIT_FAILURE);
1199         }
1200 }
1201
1202 void
1203 ttynew(void) {
1204         int m, s;
1205         struct winsize w = {term.row, term.col, 0, 0};
1206
1207         /* seems to work fine on linux, openbsd and freebsd */
1208         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1209                 die("openpty failed: %s\n", strerror(errno));
1210
1211         switch(pid = fork()) {
1212         case -1:
1213                 die("fork failed\n");
1214                 break;
1215         case 0:
1216                 setsid(); /* create a new process group */
1217                 dup2(s, STDIN_FILENO);
1218                 dup2(s, STDOUT_FILENO);
1219                 dup2(s, STDERR_FILENO);
1220                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1221                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1222                 close(s);
1223                 close(m);
1224                 execsh();
1225                 break;
1226         default:
1227                 close(s);
1228                 cmdfd = m;
1229                 signal(SIGCHLD, sigchld);
1230                 if(opt_io) {
1231                         term.mode |= MODE_PRINT;
1232                         iofd = (!strcmp(opt_io, "-")) ?
1233                                   STDOUT_FILENO :
1234                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1235                         if(iofd < 0) {
1236                                 fprintf(stderr, "Error opening %s:%s\n",
1237                                         opt_io, strerror(errno));
1238                         }
1239                 }
1240                 break;
1241         }
1242 }
1243
1244 void
1245 ttyread(void) {
1246         static char buf[BUFSIZ];
1247         static int buflen = 0;
1248         char *ptr;
1249         char s[UTF_SIZ];
1250         int charsize; /* size of utf8 char in bytes */
1251         long unicodep;
1252         int ret;
1253
1254         /* append read bytes to unprocessed bytes */
1255         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1256                 die("Couldn't read from shell: %s\n", strerror(errno));
1257
1258         /* process every complete utf8 char */
1259         buflen += ret;
1260         ptr = buf;
1261         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1262                 utf8encode(unicodep, s, UTF_SIZ);
1263                 tputc(s, charsize);
1264                 ptr += charsize;
1265                 buflen -= charsize;
1266         }
1267
1268         /* keep any uncomplete utf8 char for the next call */
1269         memmove(buf, ptr, buflen);
1270 }
1271
1272 void
1273 ttywrite(const char *s, size_t n) {
1274         if(xwrite(cmdfd, s, n) == -1)
1275                 die("write error on tty: %s\n", strerror(errno));
1276 }
1277
1278 void
1279 ttysend(char *s, size_t n) {
1280         ttywrite(s, n);
1281         if(IS_SET(MODE_ECHO))
1282                 techo(s, n);
1283 }
1284
1285 void
1286 ttyresize(void) {
1287         struct winsize w;
1288
1289         w.ws_row = term.row;
1290         w.ws_col = term.col;
1291         w.ws_xpixel = xw.tw;
1292         w.ws_ypixel = xw.th;
1293         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1294                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1295 }
1296
1297 int
1298 tattrset(int attr) {
1299         int i, j;
1300
1301         for(i = 0; i < term.row-1; i++) {
1302                 for(j = 0; j < term.col-1; j++) {
1303                         if(term.line[i][j].mode & attr)
1304                                 return 1;
1305                 }
1306         }
1307
1308         return 0;
1309 }
1310
1311 void
1312 tsetdirt(int top, int bot) {
1313         int i;
1314
1315         LIMIT(top, 0, term.row-1);
1316         LIMIT(bot, 0, term.row-1);
1317
1318         for(i = top; i <= bot; i++)
1319                 term.dirty[i] = 1;
1320 }
1321
1322 void
1323 tsetdirtattr(int attr) {
1324         int i, j;
1325
1326         for(i = 0; i < term.row-1; i++) {
1327                 for(j = 0; j < term.col-1; j++) {
1328                         if(term.line[i][j].mode & attr) {
1329                                 tsetdirt(i, i);
1330                                 break;
1331                         }
1332                 }
1333         }
1334 }
1335
1336 void
1337 tfulldirt(void) {
1338         tsetdirt(0, term.row-1);
1339 }
1340
1341 void
1342 tcursor(int mode) {
1343         static TCursor c[2];
1344         bool alt = IS_SET(MODE_ALTSCREEN);
1345
1346         if(mode == CURSOR_SAVE) {
1347                 c[alt] = term.c;
1348         } else if(mode == CURSOR_LOAD) {
1349                 term.c = c[alt];
1350                 tmoveto(c[alt].x, c[alt].y);
1351         }
1352 }
1353
1354 void
1355 treset(void) {
1356         uint i;
1357
1358         term.c = (TCursor){{
1359                 .mode = ATTR_NULL,
1360                 .fg = defaultfg,
1361                 .bg = defaultbg
1362         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1363
1364         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1365         for(i = tabspaces; i < term.col; i += tabspaces)
1366                 term.tabs[i] = 1;
1367         term.top = 0;
1368         term.bot = term.row - 1;
1369         term.mode = MODE_WRAP;
1370         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1371         term.charset = 0;
1372
1373         tclearregion(0, 0, term.col-1, term.row-1);
1374         tmoveto(0, 0);
1375         tcursor(CURSOR_SAVE);
1376 }
1377
1378 void
1379 tnew(int col, int row) {
1380         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1381         tresize(col, row);
1382         term.numlock = 1;
1383
1384         treset();
1385 }
1386
1387 void
1388 tswapscreen(void) {
1389         Line *tmp = term.line;
1390
1391         term.line = term.alt;
1392         term.alt = tmp;
1393         term.mode ^= MODE_ALTSCREEN;
1394         tfulldirt();
1395 }
1396
1397 void
1398 tscrolldown(int orig, int n) {
1399         int i;
1400         Line temp;
1401
1402         LIMIT(n, 0, term.bot-orig+1);
1403
1404         tsetdirt(orig, term.bot-n);
1405         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1406
1407         for(i = term.bot; i >= orig+n; i--) {
1408                 temp = term.line[i];
1409                 term.line[i] = term.line[i-n];
1410                 term.line[i-n] = temp;
1411         }
1412
1413         selscroll(orig, n);
1414 }
1415
1416 void
1417 tscrollup(int orig, int n) {
1418         int i;
1419         Line temp;
1420
1421         LIMIT(n, 0, term.bot-orig+1);
1422
1423         tclearregion(0, orig, term.col-1, orig+n-1);
1424         tsetdirt(orig+n, term.bot);
1425
1426         for(i = orig; i <= term.bot-n; i++) {
1427                 temp = term.line[i];
1428                 term.line[i] = term.line[i+n];
1429                 term.line[i+n] = temp;
1430         }
1431
1432         selscroll(orig, -n);
1433 }
1434
1435 void
1436 selscroll(int orig, int n) {
1437         if(sel.ob.x == -1)
1438                 return;
1439
1440         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1441                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1442                         selclear(NULL);
1443                         return;
1444                 }
1445                 if(sel.type == SEL_RECTANGULAR) {
1446                         if(sel.ob.y < term.top)
1447                                 sel.ob.y = term.top;
1448                         if(sel.oe.y > term.bot)
1449                                 sel.oe.y = term.bot;
1450                 } else {
1451                         if(sel.ob.y < term.top) {
1452                                 sel.ob.y = term.top;
1453                                 sel.ob.x = 0;
1454                         }
1455                         if(sel.oe.y > term.bot) {
1456                                 sel.oe.y = term.bot;
1457                                 sel.oe.x = term.col;
1458                         }
1459                 }
1460                 selsort();
1461         }
1462 }
1463
1464 void
1465 tnewline(int first_col) {
1466         int y = term.c.y;
1467
1468         if(y == term.bot) {
1469                 tscrollup(term.top, 1);
1470         } else {
1471                 y++;
1472         }
1473         tmoveto(first_col ? 0 : term.c.x, y);
1474 }
1475
1476 void
1477 csiparse(void) {
1478         char *p = csiescseq.buf, *np;
1479         long int v;
1480
1481         csiescseq.narg = 0;
1482         if(*p == '?') {
1483                 csiescseq.priv = 1;
1484                 p++;
1485         }
1486
1487         csiescseq.buf[csiescseq.len] = '\0';
1488         while(p < csiescseq.buf+csiescseq.len) {
1489                 np = NULL;
1490                 v = strtol(p, &np, 10);
1491                 if(np == p)
1492                         v = 0;
1493                 if(v == LONG_MAX || v == LONG_MIN)
1494                         v = -1;
1495                 csiescseq.arg[csiescseq.narg++] = v;
1496                 p = np;
1497                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1498                         break;
1499                 p++;
1500         }
1501         csiescseq.mode = *p;
1502 }
1503
1504 /* for absolute user moves, when decom is set */
1505 void
1506 tmoveato(int x, int y) {
1507         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1508 }
1509
1510 void
1511 tmoveto(int x, int y) {
1512         int miny, maxy;
1513
1514         if(term.c.state & CURSOR_ORIGIN) {
1515                 miny = term.top;
1516                 maxy = term.bot;
1517         } else {
1518                 miny = 0;
1519                 maxy = term.row - 1;
1520         }
1521         LIMIT(x, 0, term.col-1);
1522         LIMIT(y, miny, maxy);
1523         term.c.state &= ~CURSOR_WRAPNEXT;
1524         term.c.x = x;
1525         term.c.y = y;
1526 }
1527
1528 void
1529 tsetchar(char *c, Glyph *attr, int x, int y) {
1530         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1531                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1532                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1533                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1534                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1535                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1536                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1537                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1538                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1539         };
1540
1541         /*
1542          * The table is proudly stolen from rxvt.
1543          */
1544         if(attr->mode & ATTR_GFX) {
1545                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1546                         c = vt100_0[c[0] - 0x41];
1547                 }
1548         }
1549
1550         if(term.line[y][x].mode & ATTR_WIDE) {
1551                 if(x+1 < term.col) {
1552                         term.line[y][x+1].c[0] = ' ';
1553                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1554                 }
1555         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1556                 term.line[y][x-1].c[0] = ' ';
1557                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1558         }
1559
1560         term.dirty[y] = 1;
1561         term.line[y][x] = *attr;
1562         memcpy(term.line[y][x].c, c, UTF_SIZ);
1563 }
1564
1565 void
1566 tclearregion(int x1, int y1, int x2, int y2) {
1567         int x, y, temp;
1568
1569         if(x1 > x2)
1570                 temp = x1, x1 = x2, x2 = temp;
1571         if(y1 > y2)
1572                 temp = y1, y1 = y2, y2 = temp;
1573
1574         LIMIT(x1, 0, term.col-1);
1575         LIMIT(x2, 0, term.col-1);
1576         LIMIT(y1, 0, term.row-1);
1577         LIMIT(y2, 0, term.row-1);
1578
1579         for(y = y1; y <= y2; y++) {
1580                 term.dirty[y] = 1;
1581                 for(x = x1; x <= x2; x++) {
1582                         if(selected(x, y))
1583                                 selclear(NULL);
1584                         term.line[y][x] = term.c.attr;
1585                         memcpy(term.line[y][x].c, " ", 2);
1586                 }
1587         }
1588 }
1589
1590 void
1591 tdeletechar(int n) {
1592         int dst, src, size;
1593         Glyph *line;
1594
1595         LIMIT(n, 0, term.col - term.c.x);
1596
1597         dst = term.c.x;
1598         src = term.c.x + n;
1599         size = term.col - src;
1600         line = term.line[term.c.y];
1601
1602         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1603         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1604 }
1605
1606 void
1607 tinsertblank(int n) {
1608         int dst, src, size;
1609         Glyph *line;
1610
1611         LIMIT(n, 0, term.col - term.c.x);
1612
1613         dst = term.c.x + n;
1614         src = term.c.x;
1615         size = term.col - dst;
1616         line = term.line[term.c.y];
1617
1618         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1619         tclearregion(src, term.c.y, dst - 1, term.c.y);
1620 }
1621
1622 void
1623 tinsertblankline(int n) {
1624         if(BETWEEN(term.c.y, term.top, term.bot))
1625                 tscrolldown(term.c.y, n);
1626 }
1627
1628 void
1629 tdeleteline(int n) {
1630         if(BETWEEN(term.c.y, term.top, term.bot))
1631                 tscrollup(term.c.y, n);
1632 }
1633
1634 int32_t
1635 tdefcolor(int *attr, int *npar, int l) {
1636         int32_t idx = -1;
1637         uint r, g, b;
1638
1639         switch (attr[*npar + 1]) {
1640         case 2: /* direct colour in RGB space */
1641                 if (*npar + 4 >= l) {
1642                         fprintf(stderr,
1643                                 "erresc(38): Incorrect number of parameters (%d)\n",
1644                                 *npar);
1645                         break;
1646                 }
1647                 r = attr[*npar + 2];
1648                 g = attr[*npar + 3];
1649                 b = attr[*npar + 4];
1650                 *npar += 4;
1651                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1652                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1653                                 r, g, b);
1654                 else
1655                         idx = TRUECOLOR(r, g, b);
1656                 break;
1657         case 5: /* indexed colour */
1658                 if (*npar + 2 >= l) {
1659                         fprintf(stderr,
1660                                 "erresc(38): Incorrect number of parameters (%d)\n",
1661                                 *npar);
1662                         break;
1663                 }
1664                 *npar += 2;
1665                 if(!BETWEEN(attr[*npar], 0, 255))
1666                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1667                 else
1668                         idx = attr[*npar];
1669                 break;
1670         case 0: /* implemented defined (only foreground) */
1671         case 1: /* transparent */
1672         case 3: /* direct colour in CMY space */
1673         case 4: /* direct colour in CMYK space */
1674         default:
1675                 fprintf(stderr,
1676                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1677                 break;
1678         }
1679
1680         return idx;
1681 }
1682
1683 void
1684 tsetattr(int *attr, int l) {
1685         int i;
1686         int32_t idx;
1687
1688         for(i = 0; i < l; i++) {
1689                 switch(attr[i]) {
1690                 case 0:
1691                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE \
1692                                         | ATTR_BOLD | ATTR_ITALIC \
1693                                         | ATTR_BLINK);
1694                         term.c.attr.fg = defaultfg;
1695                         term.c.attr.bg = defaultbg;
1696                         break;
1697                 case 1:
1698                         term.c.attr.mode |= ATTR_BOLD;
1699                         break;
1700                 case 3:
1701                         term.c.attr.mode |= ATTR_ITALIC;
1702                         break;
1703                 case 4:
1704                         term.c.attr.mode |= ATTR_UNDERLINE;
1705                         break;
1706                 case 5: /* slow blink */
1707                 case 6: /* rapid blink */
1708                         term.c.attr.mode |= ATTR_BLINK;
1709                         break;
1710                 case 7:
1711                         term.c.attr.mode |= ATTR_REVERSE;
1712                         break;
1713                 case 21:
1714                 case 22:
1715                         term.c.attr.mode &= ~ATTR_BOLD;
1716                         break;
1717                 case 23:
1718                         term.c.attr.mode &= ~ATTR_ITALIC;
1719                         break;
1720                 case 24:
1721                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1722                         break;
1723                 case 25:
1724                 case 26:
1725                         term.c.attr.mode &= ~ATTR_BLINK;
1726                         break;
1727                 case 27:
1728                         term.c.attr.mode &= ~ATTR_REVERSE;
1729                         break;
1730                 case 38:
1731                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1732                                 term.c.attr.fg = idx;
1733                         break;
1734                 case 39:
1735                         term.c.attr.fg = defaultfg;
1736                         break;
1737                 case 48:
1738                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1739                                 term.c.attr.bg = idx;
1740                         break;
1741                 case 49:
1742                         term.c.attr.bg = defaultbg;
1743                         break;
1744                 default:
1745                         if(BETWEEN(attr[i], 30, 37)) {
1746                                 term.c.attr.fg = attr[i] - 30;
1747                         } else if(BETWEEN(attr[i], 40, 47)) {
1748                                 term.c.attr.bg = attr[i] - 40;
1749                         } else if(BETWEEN(attr[i], 90, 97)) {
1750                                 term.c.attr.fg = attr[i] - 90 + 8;
1751                         } else if(BETWEEN(attr[i], 100, 107)) {
1752                                 term.c.attr.bg = attr[i] - 100 + 8;
1753                         } else {
1754                                 fprintf(stderr,
1755                                         "erresc(default): gfx attr %d unknown\n",
1756                                         attr[i]), csidump();
1757                         }
1758                         break;
1759                 }
1760         }
1761 }
1762
1763 void
1764 tsetscroll(int t, int b) {
1765         int temp;
1766
1767         LIMIT(t, 0, term.row-1);
1768         LIMIT(b, 0, term.row-1);
1769         if(t > b) {
1770                 temp = t;
1771                 t = b;
1772                 b = temp;
1773         }
1774         term.top = t;
1775         term.bot = b;
1776 }
1777
1778 void
1779 tsetmode(bool priv, bool set, int *args, int narg) {
1780         int *lim, mode;
1781         bool alt;
1782
1783         for(lim = args + narg; args < lim; ++args) {
1784                 if(priv) {
1785                         switch(*args) {
1786                         case 1: /* DECCKM -- Cursor key */
1787                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1788                                 break;
1789                         case 5: /* DECSCNM -- Reverse video */
1790                                 mode = term.mode;
1791                                 MODBIT(term.mode, set, MODE_REVERSE);
1792                                 if(mode != term.mode)
1793                                         redraw(REDRAW_TIMEOUT);
1794                                 break;
1795                         case 6: /* DECOM -- Origin */
1796                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1797                                 tmoveato(0, 0);
1798                                 break;
1799                         case 7: /* DECAWM -- Auto wrap */
1800                                 MODBIT(term.mode, set, MODE_WRAP);
1801                                 break;
1802                         case 0:  /* Error (IGNORED) */
1803                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1804                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1805                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1806                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1807                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1808                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1809                         case 42: /* DECNRCM -- National characters (IGNORED) */
1810                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1811                                 break;
1812                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1813                                 MODBIT(term.mode, !set, MODE_HIDE);
1814                                 break;
1815                         case 9:    /* X10 mouse compatibility mode */
1816                                 xsetpointermotion(0);
1817                                 MODBIT(term.mode, 0, MODE_MOUSE);
1818                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1819                                 break;
1820                         case 1000: /* 1000: report button press */
1821                                 xsetpointermotion(0);
1822                                 MODBIT(term.mode, 0, MODE_MOUSE);
1823                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1824                                 break;
1825                         case 1002: /* 1002: report motion on button press */
1826                                 xsetpointermotion(0);
1827                                 MODBIT(term.mode, 0, MODE_MOUSE);
1828                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1829                                 break;
1830                         case 1003: /* 1003: enable all mouse motions */
1831                                 xsetpointermotion(set);
1832                                 MODBIT(term.mode, 0, MODE_MOUSE);
1833                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1834                                 break;
1835                         case 1004: /* 1004: send focus events to tty */
1836                                 MODBIT(term.mode, set, MODE_FOCUS);
1837                                 break;
1838                         case 1006: /* 1006: extended reporting mode */
1839                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1840                                 break;
1841                         case 1034:
1842                                 MODBIT(term.mode, set, MODE_8BIT);
1843                                 break;
1844                         case 1049: /* swap screen & set/restore cursor as xterm */
1845                                 if (!allowaltscreen)
1846                                         break;
1847                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1848                                 /* FALLTHRU */
1849                         case 47: /* swap screen */
1850                         case 1047:
1851                                 if (!allowaltscreen)
1852                                         break;
1853                                 alt = IS_SET(MODE_ALTSCREEN);
1854                                 if(alt) {
1855                                         tclearregion(0, 0, term.col-1,
1856                                                         term.row-1);
1857                                 }
1858                                 if(set ^ alt) /* set is always 1 or 0 */
1859                                         tswapscreen();
1860                                 if(*args != 1049)
1861                                         break;
1862                                 /* FALLTRU */
1863                         case 1048:
1864                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1865                                 break;
1866                         case 2004: /* 2004: bracketed paste mode */
1867                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1868                                 break;
1869                         /* Not implemented mouse modes. See comments there. */
1870                         case 1001: /* mouse highlight mode; can hang the
1871                                       terminal by design when implemented. */
1872                         case 1005: /* UTF-8 mouse mode; will confuse
1873                                       applications not supporting UTF-8
1874                                       and luit. */
1875                         case 1015: /* urxvt mangled mouse mode; incompatible
1876                                       and can be mistaken for other control
1877                                       codes. */
1878                         default:
1879                                 fprintf(stderr,
1880                                         "erresc: unknown private set/reset mode %d\n",
1881                                         *args);
1882                                 break;
1883                         }
1884                 } else {
1885                         switch(*args) {
1886                         case 0:  /* Error (IGNORED) */
1887                                 break;
1888                         case 2:  /* KAM -- keyboard action */
1889                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1890                                 break;
1891                         case 4:  /* IRM -- Insertion-replacement */
1892                                 MODBIT(term.mode, set, MODE_INSERT);
1893                                 break;
1894                         case 12: /* SRM -- Send/Receive */
1895                                 MODBIT(term.mode, !set, MODE_ECHO);
1896                                 break;
1897                         case 20: /* LNM -- Linefeed/new line */
1898                                 MODBIT(term.mode, set, MODE_CRLF);
1899                                 break;
1900                         default:
1901                                 fprintf(stderr,
1902                                         "erresc: unknown set/reset mode %d\n",
1903                                         *args);
1904                                 break;
1905                         }
1906                 }
1907         }
1908 }
1909
1910 void
1911 csihandle(void) {
1912         char buf[40];
1913         int len;
1914
1915         switch(csiescseq.mode) {
1916         default:
1917         unknown:
1918                 fprintf(stderr, "erresc: unknown csi ");
1919                 csidump();
1920                 /* die(""); */
1921                 break;
1922         case '@': /* ICH -- Insert <n> blank char */
1923                 DEFAULT(csiescseq.arg[0], 1);
1924                 tinsertblank(csiescseq.arg[0]);
1925                 break;
1926         case 'A': /* CUU -- Cursor <n> Up */
1927                 DEFAULT(csiescseq.arg[0], 1);
1928                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1929                 break;
1930         case 'B': /* CUD -- Cursor <n> Down */
1931         case 'e': /* VPR --Cursor <n> Down */
1932                 DEFAULT(csiescseq.arg[0], 1);
1933                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1934                 break;
1935         case 'i': /* MC -- Media Copy */
1936                 switch(csiescseq.arg[0]) {
1937                 case 0:
1938                         tdump();
1939                         break;
1940                 case 1:
1941                         tdumpline(term.c.y);
1942                         break;
1943                 case 2:
1944                         tdumpsel();
1945                         break;
1946                 case 4:
1947                         term.mode &= ~MODE_PRINT;
1948                         break;
1949                 case 5:
1950                         term.mode |= MODE_PRINT;
1951                         break;
1952                 }
1953                 break;
1954         case 'c': /* DA -- Device Attributes */
1955                 if(csiescseq.arg[0] == 0)
1956                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1957                 break;
1958         case 'C': /* CUF -- Cursor <n> Forward */
1959         case 'a': /* HPR -- Cursor <n> Forward */
1960                 DEFAULT(csiescseq.arg[0], 1);
1961                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1962                 break;
1963         case 'D': /* CUB -- Cursor <n> Backward */
1964                 DEFAULT(csiescseq.arg[0], 1);
1965                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1966                 break;
1967         case 'E': /* CNL -- Cursor <n> Down and first col */
1968                 DEFAULT(csiescseq.arg[0], 1);
1969                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1970                 break;
1971         case 'F': /* CPL -- Cursor <n> Up and first col */
1972                 DEFAULT(csiescseq.arg[0], 1);
1973                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1974                 break;
1975         case 'g': /* TBC -- Tabulation clear */
1976                 switch(csiescseq.arg[0]) {
1977                 case 0: /* clear current tab stop */
1978                         term.tabs[term.c.x] = 0;
1979                         break;
1980                 case 3: /* clear all the tabs */
1981                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1982                         break;
1983                 default:
1984                         goto unknown;
1985                 }
1986                 break;
1987         case 'G': /* CHA -- Move to <col> */
1988         case '`': /* HPA */
1989                 DEFAULT(csiescseq.arg[0], 1);
1990                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1991                 break;
1992         case 'H': /* CUP -- Move to <row> <col> */
1993         case 'f': /* HVP */
1994                 DEFAULT(csiescseq.arg[0], 1);
1995                 DEFAULT(csiescseq.arg[1], 1);
1996                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1997                 break;
1998         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1999                 DEFAULT(csiescseq.arg[0], 1);
2000                 tputtab(csiescseq.arg[0]);
2001                 break;
2002         case 'J': /* ED -- Clear screen */
2003                 selclear(NULL);
2004                 switch(csiescseq.arg[0]) {
2005                 case 0: /* below */
2006                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2007                         if(term.c.y < term.row-1) {
2008                                 tclearregion(0, term.c.y+1, term.col-1,
2009                                                 term.row-1);
2010                         }
2011                         break;
2012                 case 1: /* above */
2013                         if(term.c.y > 1)
2014                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2015                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2016                         break;
2017                 case 2: /* all */
2018                         tclearregion(0, 0, term.col-1, term.row-1);
2019                         break;
2020                 default:
2021                         goto unknown;
2022                 }
2023                 break;
2024         case 'K': /* EL -- Clear line */
2025                 switch(csiescseq.arg[0]) {
2026                 case 0: /* right */
2027                         tclearregion(term.c.x, term.c.y, term.col-1,
2028                                         term.c.y);
2029                         break;
2030                 case 1: /* left */
2031                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2032                         break;
2033                 case 2: /* all */
2034                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2035                         break;
2036                 }
2037                 break;
2038         case 'S': /* SU -- Scroll <n> line up */
2039                 DEFAULT(csiescseq.arg[0], 1);
2040                 tscrollup(term.top, csiescseq.arg[0]);
2041                 break;
2042         case 'T': /* SD -- Scroll <n> line down */
2043                 DEFAULT(csiescseq.arg[0], 1);
2044                 tscrolldown(term.top, csiescseq.arg[0]);
2045                 break;
2046         case 'L': /* IL -- Insert <n> blank lines */
2047                 DEFAULT(csiescseq.arg[0], 1);
2048                 tinsertblankline(csiescseq.arg[0]);
2049                 break;
2050         case 'l': /* RM -- Reset Mode */
2051                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2052                 break;
2053         case 'M': /* DL -- Delete <n> lines */
2054                 DEFAULT(csiescseq.arg[0], 1);
2055                 tdeleteline(csiescseq.arg[0]);
2056                 break;
2057         case 'X': /* ECH -- Erase <n> char */
2058                 DEFAULT(csiescseq.arg[0], 1);
2059                 tclearregion(term.c.x, term.c.y,
2060                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2061                 break;
2062         case 'P': /* DCH -- Delete <n> char */
2063                 DEFAULT(csiescseq.arg[0], 1);
2064                 tdeletechar(csiescseq.arg[0]);
2065                 break;
2066         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2067                 DEFAULT(csiescseq.arg[0], 1);
2068                 tputtab(-csiescseq.arg[0]);
2069                 break;
2070         case 'd': /* VPA -- Move to <row> */
2071                 DEFAULT(csiescseq.arg[0], 1);
2072                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2073                 break;
2074         case 'h': /* SM -- Set terminal mode */
2075                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2076                 break;
2077         case 'm': /* SGR -- Terminal attribute (color) */
2078                 tsetattr(csiescseq.arg, csiescseq.narg);
2079                 break;
2080         case 'n': /* DSR – Device Status Report (cursor position) */
2081                 if (csiescseq.arg[0] == 6) {
2082                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2083                                         term.c.y+1, term.c.x+1);
2084                         ttywrite(buf, len);
2085                 }
2086                 break;
2087         case 'r': /* DECSTBM -- Set Scrolling Region */
2088                 if(csiescseq.priv) {
2089                         goto unknown;
2090                 } else {
2091                         DEFAULT(csiescseq.arg[0], 1);
2092                         DEFAULT(csiescseq.arg[1], term.row);
2093                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2094                         tmoveato(0, 0);
2095                 }
2096                 break;
2097         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2098                 tcursor(CURSOR_SAVE);
2099                 break;
2100         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2101                 tcursor(CURSOR_LOAD);
2102                 break;
2103         }
2104 }
2105
2106 void
2107 csidump(void) {
2108         int i;
2109         uint c;
2110
2111         printf("ESC[");
2112         for(i = 0; i < csiescseq.len; i++) {
2113                 c = csiescseq.buf[i] & 0xff;
2114                 if(isprint(c)) {
2115                         putchar(c);
2116                 } else if(c == '\n') {
2117                         printf("(\\n)");
2118                 } else if(c == '\r') {
2119                         printf("(\\r)");
2120                 } else if(c == 0x1b) {
2121                         printf("(\\e)");
2122                 } else {
2123                         printf("(%02x)", c);
2124                 }
2125         }
2126         putchar('\n');
2127 }
2128
2129 void
2130 csireset(void) {
2131         memset(&csiescseq, 0, sizeof(csiescseq));
2132 }
2133
2134 void
2135 strhandle(void) {
2136         char *p = NULL;
2137         int j, narg, par;
2138
2139         term.esc &= ~(ESC_STR_END|ESC_STR);
2140         strparse();
2141         narg = strescseq.narg;
2142         par = atoi(strescseq.args[0]);
2143
2144         switch(strescseq.type) {
2145         case ']': /* OSC -- Operating System Command */
2146                 switch(par) {
2147                 case 0:
2148                 case 1:
2149                 case 2:
2150                         if(narg > 1)
2151                                 xsettitle(strescseq.args[1]);
2152                         return;
2153                 case 4: /* color set */
2154                         if(narg < 3)
2155                                 break;
2156                         p = strescseq.args[2];
2157                         /* fall through */
2158                 case 104: /* color reset, here p = NULL */
2159                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2160                         if (!xsetcolorname(j, p)) {
2161                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2162                         } else {
2163                                 /*
2164                                  * TODO if defaultbg color is changed, borders
2165                                  * are dirty
2166                                  */
2167                                 redraw(0);
2168                         }
2169                         return;
2170                 }
2171                 break;
2172         case 'k': /* old title set compatibility */
2173                 xsettitle(strescseq.args[0]);
2174                 return;
2175         case 'P': /* DCS -- Device Control String */
2176         case '_': /* APC -- Application Program Command */
2177         case '^': /* PM -- Privacy Message */
2178                 return;
2179         }
2180
2181         fprintf(stderr, "erresc: unknown str ");
2182         strdump();
2183 }
2184
2185 void
2186 strparse(void) {
2187         char *p = strescseq.buf;
2188
2189         strescseq.narg = 0;
2190         strescseq.buf[strescseq.len] = '\0';
2191         while(p && strescseq.narg < STR_ARG_SIZ)
2192                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2193 }
2194
2195 void
2196 strdump(void) {
2197         int i;
2198         uint c;
2199
2200         printf("ESC%c", strescseq.type);
2201         for(i = 0; i < strescseq.len; i++) {
2202                 c = strescseq.buf[i] & 0xff;
2203                 if(c == '\0') {
2204                         return;
2205                 } else if(isprint(c)) {
2206                         putchar(c);
2207                 } else if(c == '\n') {
2208                         printf("(\\n)");
2209                 } else if(c == '\r') {
2210                         printf("(\\r)");
2211                 } else if(c == 0x1b) {
2212                         printf("(\\e)");
2213                 } else {
2214                         printf("(%02x)", c);
2215                 }
2216         }
2217         printf("ESC\\\n");
2218 }
2219
2220 void
2221 strreset(void) {
2222         memset(&strescseq, 0, sizeof(strescseq));
2223 }
2224
2225 void
2226 tprinter(char *s, size_t len) {
2227         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2228                 fprintf(stderr, "Error writing in %s:%s\n",
2229                         opt_io, strerror(errno));
2230                 close(iofd);
2231                 iofd = -1;
2232         }
2233 }
2234
2235 void
2236 toggleprinter(const Arg *arg) {
2237         term.mode ^= MODE_PRINT;
2238 }
2239
2240 void
2241 printscreen(const Arg *arg) {
2242         tdump();
2243 }
2244
2245 void
2246 printsel(const Arg *arg) {
2247         tdumpsel();
2248 }
2249
2250 void
2251 tdumpsel(void) {
2252         char *ptr;
2253
2254         if((ptr = getsel())) {
2255                 tprinter(ptr, strlen(ptr));
2256                 free(ptr);
2257         }
2258 }
2259
2260 void
2261 tdumpline(int n) {
2262         Glyph *bp, *end;
2263
2264         bp = &term.line[n][0];
2265         end = &bp[term.col-1];
2266         while(end > bp && !strcmp(" ", end->c))
2267                 --end;
2268         if(bp != end || strcmp(bp->c, " ")) {
2269                 for( ;bp <= end; ++bp)
2270                         tprinter(bp->c, strlen(bp->c));
2271         }
2272         tprinter("\n", 1);
2273 }
2274
2275 void
2276 tdump(void) {
2277         int i;
2278
2279         for(i = 0; i < term.row; ++i)
2280                 tdumpline(i);
2281 }
2282
2283 void
2284 tputtab(int n) {
2285         uint x = term.c.x;
2286
2287         if(n > 0) {
2288                 while(x < term.col && n--)
2289                         for(++x; x < term.col && !term.tabs[x]; ++x)
2290                                 /* nothing */ ;
2291         } else if(n < 0) {
2292                 while(x > 0 && n++)
2293                         for(--x; x > 0 && !term.tabs[x]; --x)
2294                                 /* nothing */ ;
2295         }
2296         tmoveto(x, term.c.y);
2297 }
2298
2299 void
2300 techo(char *buf, int len) {
2301         for(; len > 0; buf++, len--) {
2302                 char c = *buf;
2303
2304                 if(ISCONTROL(c)) { /* control code */
2305                         if(c & 0x80) {
2306                                 c &= 0x7f;
2307                                 tputc("^", 1);
2308                                 tputc("[", 1);
2309                         } else if(c != '\n' && c != '\r' && c != '\t') {
2310                                 c ^= '\x40';
2311                                 tputc("^", 1);
2312                         }
2313                         tputc(&c, 1);
2314                 } else {
2315                         break;
2316                 }
2317         }
2318         if(len)
2319                 tputc(buf, len);
2320 }
2321
2322 void
2323 tdeftran(char ascii) {
2324         char c, (*bp)[2];
2325         static char tbl[][2] = {
2326                 {'0', CS_GRAPHIC0}, {'1', CS_GRAPHIC1}, {'A', CS_UK},
2327                 {'B', CS_USA},      {'<', CS_MULTI},    {'K', CS_GER},
2328                 {'5', CS_FIN},      {'C', CS_FIN},
2329                 {0, 0}
2330         };
2331
2332         for (bp = &tbl[0]; (c = (*bp)[0]) && c != ascii; ++bp)
2333                 /* nothing */;
2334
2335         if (c == 0)
2336                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2337         else
2338                 term.trantbl[term.icharset] = (*bp)[1];
2339 }
2340
2341 void
2342 tselcs(void) {
2343         MODBIT(term.c.attr.mode,
2344                term.trantbl[term.charset] == CS_GRAPHIC0,
2345                ATTR_GFX);
2346 }
2347
2348 bool
2349 tcontrolcode(uchar ascii) {
2350         static char question[UTF_SIZ] = "?";
2351
2352         switch(ascii) {
2353         case '\t':   /* HT */
2354                 tputtab(1);
2355                 break;
2356         case '\b':   /* BS */
2357                 tmoveto(term.c.x-1, term.c.y);
2358                 break;
2359         case '\r':   /* CR */
2360                 tmoveto(0, term.c.y);
2361                 break;
2362         case '\f':   /* LF */
2363         case '\v':   /* VT */
2364         case '\n':   /* LF */
2365                 /* go to first col if the mode is set */
2366                 tnewline(IS_SET(MODE_CRLF));
2367                 break;
2368         case '\a':   /* BEL */
2369                 if(term.esc & ESC_STR_END) {
2370                         /* backwards compatibility to xterm */
2371                         strhandle();
2372                 } else {
2373                         if(!(xw.state & WIN_FOCUSED))
2374                                 xseturgency(1);
2375                         if (bellvolume)
2376                                 XBell(xw.dpy, bellvolume);
2377                 }
2378                 break;
2379         case '\033': /* ESC */
2380                 csireset();
2381                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2382                 term.esc |= ESC_START;
2383                 return 1;
2384         case '\016': /* SO */
2385                 term.charset = 0;
2386                 tselcs();
2387                 break;
2388         case '\017': /* SI */
2389                 term.charset = 1;
2390                 tselcs();
2391                 break;
2392         case '\032': /* SUB */
2393                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2394         case '\030': /* CAN */
2395                 csireset();
2396                 break;
2397         case '\005': /* ENQ (IGNORED) */
2398         case '\000': /* NUL (IGNORED) */
2399         case '\021': /* XON (IGNORED) */
2400         case '\023': /* XOFF (IGNORED) */
2401         case 0177:   /* DEL (IGNORED) */
2402         case 0x84:   /* TODO: IND */
2403         case 0x85:   /* TODO: NEL */
2404         case 0x88:   /* TODO: HTS */
2405         case 0x8d:   /* TODO: RI */
2406         case 0x8e:   /* TODO: SS2 */
2407         case 0x8f:   /* TODO: SS3 */
2408         case 0x90:   /* TODO: DCS */
2409         case 0x98:   /* TODO: SOS */
2410         case 0x9a:   /* TODO: DECID */
2411         case 0x9b:   /* TODO: CSI */
2412         case 0x9c:   /* TODO: ST */
2413         case 0x9d:   /* TODO: OSC */
2414         case 0x9e:   /* TODO: PM */
2415         case 0x9f:   /* TODO: APC */
2416                 break;
2417         default:
2418                 return 0;
2419         }
2420         term.esc &= ~(ESC_STR_END|ESC_STR);
2421         return 1;
2422 }
2423
2424 void
2425 tdectest(char c) {
2426         static char E[UTF_SIZ] = "E";
2427         int x, y;
2428
2429         if(c == '8') { /* DEC screen alignment test. */
2430                 for(x = 0; x < term.col; ++x) {
2431                         for(y = 0; y < term.row; ++y)
2432                                 tsetchar(E, &term.c.attr, x, y);
2433                 }
2434         }
2435 }
2436
2437 void
2438 tputc(char *c, int len) {
2439         uchar ascii;
2440         bool control;
2441         long unicodep;
2442         int width;
2443         Glyph *gp;
2444
2445         if(len == 1) {
2446                 width = 1;
2447                 unicodep = ascii = *c;
2448         } else {
2449                 utf8decode(c, &unicodep, UTF_SIZ);
2450                 width = wcwidth(unicodep);
2451                 control = ISCONTROLC1(unicodep);
2452                 ascii = unicodep;
2453         }
2454
2455         if(IS_SET(MODE_PRINT))
2456                 tprinter(c, len);
2457         control = ISCONTROL(unicodep);
2458
2459         /*
2460          * STR sequence must be checked before anything else
2461          * because it uses all following characters until it
2462          * receives a ESC, a SUB, a ST or any other C1 control
2463          * character.
2464          */
2465         if(term.esc & ESC_STR) {
2466                 if(width == 1 &&
2467                    (ascii == '\a' || ascii == 030 ||
2468                     ascii == 032  || ascii == 033 ||
2469                     ISCONTROLC1(unicodep))) {
2470                         term.esc &= ~ESC_STR;
2471                         term.esc |= ESC_STR_END;
2472                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2473                         memmove(&strescseq.buf[strescseq.len], c, len);
2474                         strescseq.len += len;
2475                         return;
2476                 } else {
2477                 /*
2478                  * Here is a bug in terminals. If the user never sends
2479                  * some code to stop the str or esc command, then st
2480                  * will stop responding. But this is better than
2481                  * silently failing with unknown characters. At least
2482                  * then users will report back.
2483                  *
2484                  * In the case users ever get fixed, here is the code:
2485                  */
2486                 /*
2487                  * term.esc = 0;
2488                  * strhandle();
2489                  */
2490                         return;
2491                 }
2492         }
2493
2494         /*
2495          * Actions of control codes must be performed as soon they arrive
2496          * because they can be embedded inside a control sequence, and
2497          * they must not cause conflicts with sequences.
2498          */
2499         if(control) {
2500                 if (tcontrolcode(ascii))
2501                         return;
2502         } else if(term.esc & ESC_START) {
2503                 if(term.esc & ESC_CSI) {
2504                         csiescseq.buf[csiescseq.len++] = ascii;
2505                         if(BETWEEN(ascii, 0x40, 0x7E)
2506                                         || csiescseq.len >= \
2507                                         sizeof(csiescseq.buf)-1) {
2508                                 term.esc = 0;
2509                                 csiparse();
2510                                 csihandle();
2511                         }
2512                         return;
2513                 } else if(term.esc & ESC_ALTCHARSET) {
2514                         tdeftran(ascii);
2515                         tselcs();
2516                 } else if(term.esc & ESC_TEST) {
2517                         tdectest(ascii);
2518                 } else {
2519                         switch(ascii) {
2520                         case '[':
2521                                 term.esc |= ESC_CSI;
2522                                 return;
2523                         case '#':
2524                                 term.esc |= ESC_TEST;
2525                                 return;
2526                         case 'P': /* DCS -- Device Control String */
2527                         case '_': /* APC -- Application Program Command */
2528                         case '^': /* PM -- Privacy Message */
2529                         case ']': /* OSC -- Operating System Command */
2530                         case 'k': /* old title set compatibility */
2531                                 strreset();
2532                                 strescseq.type = ascii;
2533                                 term.esc |= ESC_STR;
2534                                 return;
2535                         case '(': /* set primary charset G0 */
2536                         case ')': /* set secondary charset G1 */
2537                         case '*': /* set tertiary charset G2 */
2538                         case '+': /* set quaternary charset G3 */
2539                                 term.icharset = ascii - '(';
2540                                 term.esc |= ESC_ALTCHARSET;
2541                                 return;
2542                         case 'D': /* IND -- Linefeed */
2543                                 if(term.c.y == term.bot) {
2544                                         tscrollup(term.top, 1);
2545                                 } else {
2546                                         tmoveto(term.c.x, term.c.y+1);
2547                                 }
2548                                 break;
2549                         case 'E': /* NEL -- Next line */
2550                                 tnewline(1); /* always go to first col */
2551                                 break;
2552                         case 'H': /* HTS -- Horizontal tab stop */
2553                                 term.tabs[term.c.x] = 1;
2554                                 break;
2555                         case 'M': /* RI -- Reverse index */
2556                                 if(term.c.y == term.top) {
2557                                         tscrolldown(term.top, 1);
2558                                 } else {
2559                                         tmoveto(term.c.x, term.c.y-1);
2560                                 }
2561                                 break;
2562                         case 'Z': /* DECID -- Identify Terminal */
2563                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2564                                 break;
2565                         case 'c': /* RIS -- Reset to inital state */
2566                                 treset();
2567                                 xresettitle();
2568                                 xloadcols();
2569                                 break;
2570                         case '=': /* DECPAM -- Application keypad */
2571                                 term.mode |= MODE_APPKEYPAD;
2572                                 break;
2573                         case '>': /* DECPNM -- Normal keypad */
2574                                 term.mode &= ~MODE_APPKEYPAD;
2575                                 break;
2576                         case '7': /* DECSC -- Save Cursor */
2577                                 tcursor(CURSOR_SAVE);
2578                                 break;
2579                         case '8': /* DECRC -- Restore Cursor */
2580                                 tcursor(CURSOR_LOAD);
2581                                 break;
2582                         case '\\': /* ST -- String Terminator */
2583                                 if(term.esc & ESC_STR_END)
2584                                         strhandle();
2585                                 break;
2586                         default:
2587                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2588                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2589                                 break;
2590                         }
2591                 }
2592                 term.esc = 0;
2593                 /*
2594                  * All characters which form part of a sequence are not
2595                  * printed
2596                  */
2597                 return;
2598         }
2599         /*
2600          * Display control codes only if we are in graphic mode
2601          */
2602         if(control && !(term.c.attr.mode & ATTR_GFX))
2603                 return;
2604         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2605                 selclear(NULL);
2606
2607         gp = &term.line[term.c.y][term.c.x];
2608         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2609                 gp->mode |= ATTR_WRAP;
2610                 tnewline(1);
2611         }
2612
2613         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2614                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2615
2616         if(term.c.x+width > term.col)
2617                 tnewline(1);
2618
2619         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2620
2621         if(width == 2) {
2622                 gp->mode |= ATTR_WIDE;
2623                 if(term.c.x+1 < term.col) {
2624                         gp[1].c[0] = '\0';
2625                         gp[1].mode = ATTR_WDUMMY;
2626                 }
2627         }
2628         if(term.c.x+width < term.col) {
2629                 tmoveto(term.c.x+width, term.c.y);
2630         } else {
2631                 term.c.state |= CURSOR_WRAPNEXT;
2632         }
2633 }
2634
2635 int
2636 tresize(int col, int row) {
2637         int i;
2638         int minrow = MIN(row, term.row);
2639         int mincol = MIN(col, term.col);
2640         int slide = term.c.y - row + 1;
2641         bool *bp;
2642         Line *orig;
2643
2644         if(col < 1 || row < 1)
2645                 return 0;
2646
2647         /* free unneeded rows */
2648         i = 0;
2649         if(slide > 0) {
2650                 /*
2651                  * slide screen to keep cursor where we expect it -
2652                  * tscrollup would work here, but we can optimize to
2653                  * memmove because we're freeing the earlier lines
2654                  */
2655                 for(/* i = 0 */; i < slide; i++) {
2656                         free(term.line[i]);
2657                         free(term.alt[i]);
2658                 }
2659                 memmove(term.line, term.line + slide, row * sizeof(Line));
2660                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2661         }
2662         for(i += row; i < term.row; i++) {
2663                 free(term.line[i]);
2664                 free(term.alt[i]);
2665         }
2666
2667         /* resize to new height */
2668         term.line = xrealloc(term.line, row * sizeof(Line));
2669         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2670         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2671         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2672
2673         /* resize each row to new width, zero-pad if needed */
2674         for(i = 0; i < minrow; i++) {
2675                 term.dirty[i] = 1;
2676                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2677                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2678         }
2679
2680         /* allocate any new rows */
2681         for(/* i == minrow */; i < row; i++) {
2682                 term.dirty[i] = 1;
2683                 term.line[i] = xmalloc(col * sizeof(Glyph));
2684                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2685         }
2686         if(col > term.col) {
2687                 bp = term.tabs + term.col;
2688
2689                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2690                 while(--bp > term.tabs && !*bp)
2691                         /* nothing */ ;
2692                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2693                         *bp = 1;
2694         }
2695         /* update terminal size */
2696         term.col = col;
2697         term.row = row;
2698         /* reset scrolling region */
2699         tsetscroll(0, row-1);
2700         /* make use of the LIMIT in tmoveto */
2701         tmoveto(term.c.x, term.c.y);
2702         /* Clearing both screens */
2703         orig = term.line;
2704         do {
2705                 if(mincol < col && 0 < minrow) {
2706                         tclearregion(mincol, 0, col - 1, minrow - 1);
2707                 }
2708                 if(0 < col && minrow < row) {
2709                         tclearregion(0, minrow, col - 1, row - 1);
2710                 }
2711                 tcursor(CURSOR_SAVE);
2712                 tswapscreen();
2713                 tcursor(CURSOR_LOAD);
2714         } while(orig != term.line);
2715
2716         return (slide > 0);
2717 }
2718
2719 void
2720 xresize(int col, int row) {
2721         xw.tw = MAX(1, col * xw.cw);
2722         xw.th = MAX(1, row * xw.ch);
2723
2724         XFreePixmap(xw.dpy, xw.buf);
2725         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2726                         DefaultDepth(xw.dpy, xw.scr));
2727         XftDrawChange(xw.draw, xw.buf);
2728         xclear(0, 0, xw.w, xw.h);
2729 }
2730
2731 static inline ushort
2732 sixd_to_16bit(int x) {
2733         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2734 }
2735
2736 void
2737 xloadcols(void) {
2738         int i, r, g, b;
2739         XRenderColor color = { .alpha = 0xffff };
2740         static bool loaded;
2741         Colour *cp;
2742
2743         if(loaded) {
2744                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2745                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2746         }
2747
2748         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2749         for(i = 0; i < LEN(colorname); i++) {
2750                 if(!colorname[i])
2751                         continue;
2752                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2753                         die("Could not allocate color '%s'\n", colorname[i]);
2754                 }
2755         }
2756
2757         /* load colors [16-255] ; same colors as xterm */
2758         for(i = 16, r = 0; r < 6; r++) {
2759                 for(g = 0; g < 6; g++) {
2760                         for(b = 0; b < 6; b++) {
2761                                 color.red = sixd_to_16bit(r);
2762                                 color.green = sixd_to_16bit(g);
2763                                 color.blue = sixd_to_16bit(b);
2764                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i])) {
2765                                         die("Could not allocate color %d\n", i);
2766                                 }
2767                                 i++;
2768                         }
2769                 }
2770         }
2771
2772         for(r = 0; r < 24; r++, i++) {
2773                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
2774                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
2775                                         &dc.col[i])) {
2776                         die("Could not allocate color %d\n", i);
2777                 }
2778         }
2779         loaded = true;
2780 }
2781
2782 int
2783 xsetcolorname(int x, const char *name) {
2784         XRenderColor color = { .alpha = 0xffff };
2785         Colour colour;
2786         if(!BETWEEN(x, 0, LEN(colorname)))
2787                 return -1;
2788         if(!name) {
2789                 if(BETWEEN(x, 16, 16 + 215)) {
2790                         int r = (x - 16) / 36, g = ((x - 16) % 36) / 6, b = (x - 16) % 6;
2791                         color.red = sixd_to_16bit(r);
2792                         color.green = sixd_to_16bit(g);
2793                         color.blue = sixd_to_16bit(b);
2794                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2795                                 return 0; /* something went wrong */
2796                         dc.col[x] = colour;
2797                         return 1;
2798                 } else if(BETWEEN(x, 16 + 216, 255)) {
2799                         color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x - (16 + 216));
2800                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2801                                 return 0; /* something went wrong */
2802                         dc.col[x] = colour;
2803                         return 1;
2804                 } else {
2805                         name = colorname[x];
2806                 }
2807         }
2808         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &colour))
2809                 return 0;
2810         dc.col[x] = colour;
2811         return 1;
2812 }
2813
2814 void
2815 xtermclear(int col1, int row1, int col2, int row2) {
2816         XftDrawRect(xw.draw,
2817                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2818                         borderpx + col1 * xw.cw,
2819                         borderpx + row1 * xw.ch,
2820                         (col2-col1+1) * xw.cw,
2821                         (row2-row1+1) * xw.ch);
2822 }
2823
2824 /*
2825  * Absolute coordinates.
2826  */
2827 void
2828 xclear(int x1, int y1, int x2, int y2) {
2829         XftDrawRect(xw.draw,
2830                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2831                         x1, y1, x2-x1, y2-y1);
2832 }
2833
2834 void
2835 xhints(void) {
2836         XClassHint class = {opt_class ? opt_class : termname, termname};
2837         XWMHints wm = {.flags = InputHint, .input = 1};
2838         XSizeHints *sizeh = NULL;
2839
2840         sizeh = XAllocSizeHints();
2841
2842         sizeh->flags = PSize | PResizeInc | PBaseSize;
2843         sizeh->height = xw.h;
2844         sizeh->width = xw.w;
2845         sizeh->height_inc = xw.ch;
2846         sizeh->width_inc = xw.cw;
2847         sizeh->base_height = 2 * borderpx;
2848         sizeh->base_width = 2 * borderpx;
2849         if(xw.isfixed == True) {
2850                 sizeh->flags |= PMaxSize | PMinSize;
2851                 sizeh->min_width = sizeh->max_width = xw.w;
2852                 sizeh->min_height = sizeh->max_height = xw.h;
2853         }
2854         if(xw.gm & (XValue|YValue)) {
2855                 sizeh->flags |= USPosition | PWinGravity;
2856                 sizeh->x = xw.l;
2857                 sizeh->y = xw.t;
2858                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2859         }
2860
2861         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2862                         &class);
2863         XFree(sizeh);
2864 }
2865
2866 int
2867 xgeommasktogravity(int mask) {
2868         switch(mask & (XNegative|YNegative)) {
2869         case 0:
2870                 return NorthWestGravity;
2871         case XNegative:
2872                 return NorthEastGravity;
2873         case YNegative:
2874                 return SouthWestGravity;
2875         }
2876         return SouthEastGravity;
2877 }
2878
2879 int
2880 xloadfont(Font *f, FcPattern *pattern) {
2881         FcPattern *match;
2882         FcResult result;
2883
2884         match = FcFontMatch(NULL, pattern, &result);
2885         if(!match)
2886                 return 1;
2887
2888         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2889                 FcPatternDestroy(match);
2890                 return 1;
2891         }
2892
2893         f->set = NULL;
2894         f->pattern = FcPatternDuplicate(pattern);
2895
2896         f->ascent = f->match->ascent;
2897         f->descent = f->match->descent;
2898         f->lbearing = 0;
2899         f->rbearing = f->match->max_advance_width;
2900
2901         f->height = f->ascent + f->descent;
2902         f->width = f->lbearing + f->rbearing;
2903
2904         return 0;
2905 }
2906
2907 void
2908 xloadfonts(char *fontstr, double fontsize) {
2909         FcPattern *pattern;
2910         FcResult r_sz, r_psz;
2911         double fontval;
2912
2913         if(fontstr[0] == '-') {
2914                 pattern = XftXlfdParse(fontstr, False, False);
2915         } else {
2916                 pattern = FcNameParse((FcChar8 *)fontstr);
2917         }
2918
2919         if(!pattern)
2920                 die("st: can't open font %s\n", fontstr);
2921
2922         if(fontsize > 0) {
2923                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2924                 FcPatternDel(pattern, FC_SIZE);
2925                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2926                 usedfontsize = fontsize;
2927         } else {
2928                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2929                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2930                 if(r_psz == FcResultMatch) {
2931                         usedfontsize = fontval;
2932                 } else if(r_sz == FcResultMatch) {
2933                         usedfontsize = -1;
2934                 } else {
2935                         /*
2936                          * Default font size is 12, if none given. This is to
2937                          * have a known usedfontsize value.
2938                          */
2939                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2940                         usedfontsize = 12;
2941                 }
2942         }
2943
2944         FcConfigSubstitute(0, pattern, FcMatchPattern);
2945         FcDefaultSubstitute(pattern);
2946
2947         if(xloadfont(&dc.font, pattern))
2948                 die("st: can't open font %s\n", fontstr);
2949
2950         if(usedfontsize < 0) {
2951                 FcPatternGetDouble(dc.font.match->pattern,
2952                                    FC_PIXEL_SIZE, 0, &fontval);
2953                 usedfontsize = fontval;
2954         }
2955
2956         /* Setting character width and height. */
2957         xw.cw = CEIL(dc.font.width * cwscale);
2958         xw.ch = CEIL(dc.font.height * chscale);
2959
2960         FcPatternDel(pattern, FC_SLANT);
2961         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2962         if(xloadfont(&dc.ifont, pattern))
2963                 die("st: can't open font %s\n", fontstr);
2964
2965         FcPatternDel(pattern, FC_WEIGHT);
2966         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2967         if(xloadfont(&dc.ibfont, pattern))
2968                 die("st: can't open font %s\n", fontstr);
2969
2970         FcPatternDel(pattern, FC_SLANT);
2971         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2972         if(xloadfont(&dc.bfont, pattern))
2973                 die("st: can't open font %s\n", fontstr);
2974
2975         FcPatternDestroy(pattern);
2976 }
2977
2978 int
2979 xloadfontset(Font *f) {
2980         FcResult result;
2981
2982         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
2983                 return 1;
2984         return 0;
2985 }
2986
2987 void
2988 xunloadfont(Font *f) {
2989         XftFontClose(xw.dpy, f->match);
2990         FcPatternDestroy(f->pattern);
2991         if(f->set)
2992                 FcFontSetDestroy(f->set);
2993 }
2994
2995 void
2996 xunloadfonts(void) {
2997         int i;
2998
2999         /* Free the loaded fonts in the font cache.  */
3000         for(i = 0; i < frclen; i++) {
3001                 XftFontClose(xw.dpy, frc[i].font);
3002         }
3003         frclen = 0;
3004
3005         xunloadfont(&dc.font);
3006         xunloadfont(&dc.bfont);
3007         xunloadfont(&dc.ifont);
3008         xunloadfont(&dc.ibfont);
3009 }
3010
3011 void
3012 xzoom(const Arg *arg) {
3013         xunloadfonts();
3014         xloadfonts(usedfont, usedfontsize + arg->i);
3015         cresize(0, 0);
3016         redraw(0);
3017 }
3018
3019 void
3020 xinit(void) {
3021         XGCValues gcvalues;
3022         Cursor cursor;
3023         Window parent;
3024         pid_t thispid = getpid();
3025
3026         if(!(xw.dpy = XOpenDisplay(NULL)))
3027                 die("Can't open display\n");
3028         xw.scr = XDefaultScreen(xw.dpy);
3029         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3030
3031         /* font */
3032         if(!FcInit())
3033                 die("Could not init fontconfig.\n");
3034
3035         usedfont = (opt_font == NULL)? font : opt_font;
3036         xloadfonts(usedfont, 0);
3037
3038         /* colors */
3039         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3040         xloadcols();
3041
3042         /* adjust fixed window geometry */
3043         xw.w = 2 * borderpx + term.col * xw.cw;
3044         xw.h = 2 * borderpx + term.row * xw.ch;
3045         if(xw.gm & XNegative)
3046                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3047         if(xw.gm & YNegative)
3048                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3049
3050         /* Events */
3051         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3052         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3053         xw.attrs.bit_gravity = NorthWestGravity;
3054         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3055                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3056                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3057         xw.attrs.colormap = xw.cmap;
3058
3059         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3060                         XRootWindow(xw.dpy, xw.scr);
3061         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3062                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3063                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3064                         | CWEventMask | CWColormap, &xw.attrs);
3065
3066         memset(&gcvalues, 0, sizeof(gcvalues));
3067         gcvalues.graphics_exposures = False;
3068         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3069                         &gcvalues);
3070         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3071                         DefaultDepth(xw.dpy, xw.scr));
3072         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3073         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3074
3075         /* Xft rendering context */
3076         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3077
3078         /* input methods */
3079         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3080                 XSetLocaleModifiers("@im=local");
3081                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3082                         XSetLocaleModifiers("@im=");
3083                         if((xw.xim = XOpenIM(xw.dpy,
3084                                         NULL, NULL, NULL)) == NULL) {
3085                                 die("XOpenIM failed. Could not open input"
3086                                         " device.\n");
3087                         }
3088                 }
3089         }
3090         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3091                                            | XIMStatusNothing, XNClientWindow, xw.win,
3092                                            XNFocusWindow, xw.win, NULL);
3093         if(xw.xic == NULL)
3094                 die("XCreateIC failed. Could not obtain input method.\n");
3095
3096         /* white cursor, black outline */
3097         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3098         XDefineCursor(xw.dpy, xw.win, cursor);
3099         XRecolorCursor(xw.dpy, cursor,
3100                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3101                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3102
3103         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3104         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3105         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3106         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3107
3108         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3109         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3110                         PropModeReplace, (uchar *)&thispid, 1);
3111
3112         xresettitle();
3113         XMapWindow(xw.dpy, xw.win);
3114         xhints();
3115         XSync(xw.dpy, False);
3116 }
3117
3118 void
3119 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3120         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3121             width = charlen * xw.cw, xp, i;
3122         int frcflags;
3123         int u8fl, u8fblen, u8cblen, doesexist;
3124         char *u8c, *u8fs;
3125         long unicodep;
3126         Font *font = &dc.font;
3127         FcResult fcres;
3128         FcPattern *fcpattern, *fontpattern;
3129         FcFontSet *fcsets[] = { NULL };
3130         FcCharSet *fccharset;
3131         Colour *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3132         XRenderColor colfg, colbg;
3133         XRectangle r;
3134         int oneatatime;
3135
3136         frcflags = FRC_NORMAL;
3137
3138         if(base.mode & ATTR_ITALIC) {
3139                 if(base.fg == defaultfg)
3140                         base.fg = defaultitalic;
3141                 font = &dc.ifont;
3142                 frcflags = FRC_ITALIC;
3143         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3144                 if(base.fg == defaultfg)
3145                         base.fg = defaultitalic;
3146                 font = &dc.ibfont;
3147                 frcflags = FRC_ITALICBOLD;
3148         } else if(base.mode & ATTR_UNDERLINE) {
3149                 if(base.fg == defaultfg)
3150                         base.fg = defaultunderline;
3151         }
3152
3153         if(IS_TRUECOL(base.fg)) {
3154                 colfg.alpha = 0xffff;
3155                 colfg.red = TRUERED(base.fg);
3156                 colfg.green = TRUEGREEN(base.fg);
3157                 colfg.blue = TRUEBLUE(base.fg);
3158                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3159                 fg = &truefg;
3160         } else {
3161                 fg = &dc.col[base.fg];
3162         }
3163
3164         if(IS_TRUECOL(base.bg)) {
3165                 colbg.alpha = 0xffff;
3166                 colbg.green = TRUEGREEN(base.bg);
3167                 colbg.red = TRUERED(base.bg);
3168                 colbg.blue = TRUEBLUE(base.bg);
3169                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3170                 bg = &truebg;
3171         } else {
3172                 bg = &dc.col[base.bg];
3173         }
3174
3175         if(base.mode & ATTR_BOLD) {
3176                 if(BETWEEN(base.fg, 0, 7)) {
3177                         /* basic system colors */
3178                         fg = &dc.col[base.fg + 8];
3179                 } else if(BETWEEN(base.fg, 16, 195)) {
3180                         /* 256 colors */
3181                         fg = &dc.col[base.fg + 36];
3182                 } else if(BETWEEN(base.fg, 232, 251)) {
3183                         /* greyscale */
3184                         fg = &dc.col[base.fg + 4];
3185                 }
3186                 /*
3187                  * Those ranges will not be brightened:
3188                  *    8 - 15 – bright system colors
3189                  *    196 - 231 – highest 256 color cube
3190                  *    252 - 255 – brightest colors in greyscale
3191                  */
3192                 font = &dc.bfont;
3193                 frcflags = FRC_BOLD;
3194         }
3195
3196         if(IS_SET(MODE_REVERSE)) {
3197                 if(fg == &dc.col[defaultfg]) {
3198                         fg = &dc.col[defaultbg];
3199                 } else {
3200                         colfg.red = ~fg->color.red;
3201                         colfg.green = ~fg->color.green;
3202                         colfg.blue = ~fg->color.blue;
3203                         colfg.alpha = fg->color.alpha;
3204                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3205                                         &revfg);
3206                         fg = &revfg;
3207                 }
3208
3209                 if(bg == &dc.col[defaultbg]) {
3210                         bg = &dc.col[defaultfg];
3211                 } else {
3212                         colbg.red = ~bg->color.red;
3213                         colbg.green = ~bg->color.green;
3214                         colbg.blue = ~bg->color.blue;
3215                         colbg.alpha = bg->color.alpha;
3216                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3217                                         &revbg);
3218                         bg = &revbg;
3219                 }
3220         }
3221
3222         if(base.mode & ATTR_REVERSE) {
3223                 temp = fg;
3224                 fg = bg;
3225                 bg = temp;
3226         }
3227
3228         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3229                 fg = bg;
3230
3231         /* Intelligent cleaning up of the borders. */
3232         if(x == 0) {
3233                 xclear(0, (y == 0)? 0 : winy, borderpx,
3234                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3235         }
3236         if(x + charlen >= term.col) {
3237                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3238                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3239         }
3240         if(y == 0)
3241                 xclear(winx, 0, winx + width, borderpx);
3242         if(y == term.row-1)
3243                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3244
3245         /* Clean up the region we want to draw to. */
3246         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3247
3248         /* Set the clip region because Xft is sometimes dirty. */
3249         r.x = 0;
3250         r.y = 0;
3251         r.height = xw.ch;
3252         r.width = width;
3253         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3254
3255         for(xp = winx; bytelen > 0;) {
3256                 /*
3257                  * Search for the range in the to be printed string of glyphs
3258                  * that are in the main font. Then print that range. If
3259                  * some glyph is found that is not in the font, do the
3260                  * fallback dance.
3261                  */
3262                 u8fs = s;
3263                 u8fblen = 0;
3264                 u8fl = 0;
3265                 oneatatime = font->width != xw.cw;
3266                 for(;;) {
3267                         u8c = s;
3268                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3269                         s += u8cblen;
3270                         bytelen -= u8cblen;
3271
3272                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3273                         if(oneatatime || !doesexist || bytelen <= 0) {
3274                                 if(oneatatime || bytelen <= 0) {
3275                                         if(doesexist) {
3276                                                 u8fl++;
3277                                                 u8fblen += u8cblen;
3278                                         }
3279                                 }
3280
3281                                 if(u8fl > 0) {
3282                                         XftDrawStringUtf8(xw.draw, fg,
3283                                                         font->match, xp,
3284                                                         winy + font->ascent,
3285                                                         (FcChar8 *)u8fs,
3286                                                         u8fblen);
3287                                         xp += xw.cw * u8fl;
3288
3289                                 }
3290                                 break;
3291                         }
3292
3293                         u8fl++;
3294                         u8fblen += u8cblen;
3295                 }
3296                 if(doesexist) {
3297                         if(oneatatime)
3298                                 continue;
3299                         break;
3300                 }
3301
3302                 /* Search the font cache. */
3303                 for(i = 0; i < frclen; i++) {
3304                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3305                                         && frc[i].flags == frcflags) {
3306                                 break;
3307                         }
3308                 }
3309
3310                 /* Nothing was found. */
3311                 if(i >= frclen) {
3312                         if(!font->set)
3313                                 xloadfontset(font);
3314                         fcsets[0] = font->set;
3315
3316                         /*
3317                          * Nothing was found in the cache. Now use
3318                          * some dozen of Fontconfig calls to get the
3319                          * font for one single character.
3320                          *
3321                          * Xft and fontconfig are design failures.
3322                          */
3323                         fcpattern = FcPatternDuplicate(font->pattern);
3324                         fccharset = FcCharSetCreate();
3325
3326                         FcCharSetAddChar(fccharset, unicodep);
3327                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3328                                         fccharset);
3329                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3330                                         FcTrue);
3331
3332                         FcConfigSubstitute(0, fcpattern,
3333                                         FcMatchPattern);
3334                         FcDefaultSubstitute(fcpattern);
3335
3336                         fontpattern = FcFontSetMatch(0, fcsets,
3337                                         FcTrue, fcpattern, &fcres);
3338
3339                         /*
3340                          * Overwrite or create the new cache entry.
3341                          */
3342                         if(frclen >= LEN(frc)) {
3343                                 frclen = LEN(frc) - 1;
3344                                 XftFontClose(xw.dpy, frc[frclen].font);
3345                         }
3346
3347                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3348                                         fontpattern);
3349                         frc[frclen].flags = frcflags;
3350
3351                         i = frclen;
3352                         frclen++;
3353
3354                         FcPatternDestroy(fcpattern);
3355                         FcCharSetDestroy(fccharset);
3356                 }
3357
3358                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3359                                 xp, winy + frc[i].font->ascent,
3360                                 (FcChar8 *)u8c, u8cblen);
3361
3362                 xp += xw.cw * wcwidth(unicodep);
3363         }
3364
3365         /*
3366          * This is how the loop above actually should be. Why does the
3367          * application have to care about font details?
3368          *
3369          * I have to repeat: Xft and Fontconfig are design failures.
3370          */
3371         /*
3372         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3373                         winy + font->ascent, (FcChar8 *)s, bytelen);
3374         */
3375
3376         if(base.mode & ATTR_UNDERLINE) {
3377                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3378                                 width, 1);
3379         }
3380
3381         /* Reset clip to none. */
3382         XftDrawSetClip(xw.draw, 0);
3383 }
3384
3385 void
3386 xdrawcursor(void) {
3387         static int oldx = 0, oldy = 0;
3388         int sl, width, curx;
3389         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3390
3391         LIMIT(oldx, 0, term.col-1);
3392         LIMIT(oldy, 0, term.row-1);
3393
3394         curx = term.c.x;
3395
3396         /* adjust position if in dummy */
3397         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3398                 oldx--;
3399         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3400                 curx--;
3401
3402         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3403
3404         /* remove the old cursor */
3405         sl = utf8len(term.line[oldy][oldx].c);
3406         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3407         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3408                         oldy, width, sl);
3409
3410         /* draw the new one */
3411         if(!(IS_SET(MODE_HIDE))) {
3412                 if(xw.state & WIN_FOCUSED) {
3413                         if(IS_SET(MODE_REVERSE)) {
3414                                 g.mode |= ATTR_REVERSE;
3415                                 g.fg = defaultcs;
3416                                 g.bg = defaultfg;
3417                         }
3418
3419                         sl = utf8len(g.c);
3420                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3421                                 ? 2 : 1;
3422                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3423                 } else {
3424                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3425                                         borderpx + curx * xw.cw,
3426                                         borderpx + term.c.y * xw.ch,
3427                                         xw.cw - 1, 1);
3428                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3429                                         borderpx + curx * xw.cw,
3430                                         borderpx + term.c.y * xw.ch,
3431                                         1, xw.ch - 1);
3432                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3433                                         borderpx + (curx + 1) * xw.cw - 1,
3434                                         borderpx + term.c.y * xw.ch,
3435                                         1, xw.ch - 1);
3436                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3437                                         borderpx + curx * xw.cw,
3438                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3439                                         xw.cw, 1);
3440                 }
3441                 oldx = curx, oldy = term.c.y;
3442         }
3443 }
3444
3445
3446 void
3447 xsettitle(char *p) {
3448         XTextProperty prop;
3449
3450         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3451                         &prop);
3452         XSetWMName(xw.dpy, xw.win, &prop);
3453         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3454         XFree(prop.value);
3455 }
3456
3457 void
3458 xresettitle(void) {
3459         xsettitle(opt_title ? opt_title : "st");
3460 }
3461
3462 void
3463 redraw(int timeout) {
3464         struct timespec tv = {0, timeout * 1000};
3465
3466         draw();
3467
3468         if(timeout > 0) {
3469                 nanosleep(&tv, NULL);
3470                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3471         }
3472 }
3473
3474 void
3475 draw(void) {
3476         drawregion(0, 0, term.col, term.row);
3477         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3478                         xw.h, 0, 0);
3479         XSetForeground(xw.dpy, dc.gc,
3480                         dc.col[IS_SET(MODE_REVERSE)?
3481                                 defaultfg : defaultbg].pixel);
3482 }
3483
3484 void
3485 drawregion(int x1, int y1, int x2, int y2) {
3486         int ic, ib, x, y, ox, sl;
3487         Glyph base, new;
3488         char buf[DRAW_BUF_SIZ];
3489         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3490         long unicodep;
3491
3492         if(!(xw.state & WIN_VISIBLE))
3493                 return;
3494
3495         for(y = y1; y < y2; y++) {
3496                 if(!term.dirty[y])
3497                         continue;
3498
3499                 xtermclear(0, y, term.col, y);
3500                 term.dirty[y] = 0;
3501                 base = term.line[y][0];
3502                 ic = ib = ox = 0;
3503                 for(x = x1; x < x2; x++) {
3504                         new = term.line[y][x];
3505                         if(new.mode == ATTR_WDUMMY)
3506                                 continue;
3507                         if(ena_sel && selected(x, y))
3508                                 new.mode ^= ATTR_REVERSE;
3509                         if(ib > 0 && (ATTRCMP(base, new)
3510                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3511                                 xdraws(buf, base, ox, y, ic, ib);
3512                                 ic = ib = 0;
3513                         }
3514                         if(ib == 0) {
3515                                 ox = x;
3516                                 base = new;
3517                         }
3518
3519                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3520                         memcpy(buf+ib, new.c, sl);
3521                         ib += sl;
3522                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3523                 }
3524                 if(ib > 0)
3525                         xdraws(buf, base, ox, y, ic, ib);
3526         }
3527         xdrawcursor();
3528 }
3529
3530 void
3531 expose(XEvent *ev) {
3532         XExposeEvent *e = &ev->xexpose;
3533
3534         if(xw.state & WIN_REDRAW) {
3535                 if(!e->count)
3536                         xw.state &= ~WIN_REDRAW;
3537         }
3538         redraw(0);
3539 }
3540
3541 void
3542 visibility(XEvent *ev) {
3543         XVisibilityEvent *e = &ev->xvisibility;
3544
3545         if(e->state == VisibilityFullyObscured) {
3546                 xw.state &= ~WIN_VISIBLE;
3547         } else if(!(xw.state & WIN_VISIBLE)) {
3548                 /* need a full redraw for next Expose, not just a buf copy */
3549                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3550         }
3551 }
3552
3553 void
3554 unmap(XEvent *ev) {
3555         xw.state &= ~WIN_VISIBLE;
3556 }
3557
3558 void
3559 xsetpointermotion(int set) {
3560         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3561         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3562 }
3563
3564 void
3565 xseturgency(int add) {
3566         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3567
3568         MODBIT(h->flags, add, XUrgencyHint);
3569         XSetWMHints(xw.dpy, xw.win, h);
3570         XFree(h);
3571 }
3572
3573 void
3574 focus(XEvent *ev) {
3575         XFocusChangeEvent *e = &ev->xfocus;
3576
3577         if(e->mode == NotifyGrab)
3578                 return;
3579
3580         if(ev->type == FocusIn) {
3581                 XSetICFocus(xw.xic);
3582                 xw.state |= WIN_FOCUSED;
3583                 xseturgency(0);
3584                 if(IS_SET(MODE_FOCUS))
3585                         ttywrite("\033[I", 3);
3586         } else {
3587                 XUnsetICFocus(xw.xic);
3588                 xw.state &= ~WIN_FOCUSED;
3589                 if(IS_SET(MODE_FOCUS))
3590                         ttywrite("\033[O", 3);
3591         }
3592 }
3593
3594 static inline bool
3595 match(uint mask, uint state) {
3596         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3597 }
3598
3599 void
3600 numlock(const Arg *dummy) {
3601         term.numlock ^= 1;
3602 }
3603
3604 char*
3605 kmap(KeySym k, uint state) {
3606         Key *kp;
3607         int i;
3608
3609         /* Check for mapped keys out of X11 function keys. */
3610         for(i = 0; i < LEN(mappedkeys); i++) {
3611                 if(mappedkeys[i] == k)
3612                         break;
3613         }
3614         if(i == LEN(mappedkeys)) {
3615                 if((k & 0xFFFF) < 0xFD00)
3616                         return NULL;
3617         }
3618
3619         for(kp = key; kp < key + LEN(key); kp++) {
3620                 if(kp->k != k)
3621                         continue;
3622
3623                 if(!match(kp->mask, state))
3624                         continue;
3625
3626                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3627                         continue;
3628                 if(term.numlock && kp->appkey == 2)
3629                         continue;
3630
3631                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3632                         continue;
3633
3634                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3635                         continue;
3636
3637                 return kp->s;
3638         }
3639
3640         return NULL;
3641 }
3642
3643 void
3644 kpress(XEvent *ev) {
3645         XKeyEvent *e = &ev->xkey;
3646         KeySym ksym;
3647         char buf[32], *customkey;
3648         int len;
3649         long c;
3650         Status status;
3651         Shortcut *bp;
3652
3653         if(IS_SET(MODE_KBDLOCK))
3654                 return;
3655
3656         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3657         /* 1. shortcuts */
3658         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3659                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3660                         bp->func(&(bp->arg));
3661                         return;
3662                 }
3663         }
3664
3665         /* 2. custom keys from config.h */
3666         if((customkey = kmap(ksym, e->state))) {
3667                 ttysend(customkey, strlen(customkey));
3668                 return;
3669         }
3670
3671         /* 3. composed string from input method */
3672         if(len == 0)
3673                 return;
3674         if(len == 1 && e->state & Mod1Mask) {
3675                 if(IS_SET(MODE_8BIT)) {
3676                         if(*buf < 0177) {
3677                                 c = *buf | 0x80;
3678                                 len = utf8encode(c, buf, UTF_SIZ);
3679                         }
3680                 } else {
3681                         buf[1] = buf[0];
3682                         buf[0] = '\033';
3683                         len = 2;
3684                 }
3685         }
3686         ttysend(buf, len);
3687 }
3688
3689
3690 void
3691 cmessage(XEvent *e) {
3692         /*
3693          * See xembed specs
3694          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3695          */
3696         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3697                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3698                         xw.state |= WIN_FOCUSED;
3699                         xseturgency(0);
3700                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3701                         xw.state &= ~WIN_FOCUSED;
3702                 }
3703         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3704                 /* Send SIGHUP to shell */
3705                 kill(pid, SIGHUP);
3706                 exit(EXIT_SUCCESS);
3707         }
3708 }
3709
3710 void
3711 cresize(int width, int height) {
3712         int col, row;
3713
3714         if(width != 0)
3715                 xw.w = width;
3716         if(height != 0)
3717                 xw.h = height;
3718
3719         col = (xw.w - 2 * borderpx) / xw.cw;
3720         row = (xw.h - 2 * borderpx) / xw.ch;
3721
3722         tresize(col, row);
3723         xresize(col, row);
3724         ttyresize();
3725 }
3726
3727 void
3728 resize(XEvent *e) {
3729         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3730                 return;
3731
3732         cresize(e->xconfigure.width, e->xconfigure.height);
3733 }
3734
3735 void
3736 run(void) {
3737         XEvent ev;
3738         int w = xw.w, h = xw.h;
3739         fd_set rfd;
3740         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3741         struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
3742
3743         /* Waiting for window mapping */
3744         while(1) {
3745                 XNextEvent(xw.dpy, &ev);
3746                 if(ev.type == ConfigureNotify) {
3747                         w = ev.xconfigure.width;
3748                         h = ev.xconfigure.height;
3749                 } else if(ev.type == MapNotify) {
3750                         break;
3751                 }
3752         }
3753
3754         ttynew();
3755         cresize(w, h);
3756
3757         gettimeofday(&last, NULL);
3758         lastblink = last;
3759
3760         for(xev = actionfps;;) {
3761                 long deltatime;
3762
3763                 FD_ZERO(&rfd);
3764                 FD_SET(cmdfd, &rfd);
3765                 FD_SET(xfd, &rfd);
3766
3767                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3768                         if(errno == EINTR)
3769                                 continue;
3770                         die("select failed: %s\n", strerror(errno));
3771                 }
3772                 if(FD_ISSET(cmdfd, &rfd)) {
3773                         ttyread();
3774                         if(blinktimeout) {
3775                                 blinkset = tattrset(ATTR_BLINK);
3776                                 if(!blinkset)
3777                                         MODBIT(term.mode, 0, MODE_BLINK);
3778                         }
3779                 }
3780
3781                 if(FD_ISSET(xfd, &rfd))
3782                         xev = actionfps;
3783
3784                 gettimeofday(&now, NULL);
3785                 drawtimeout.tv_sec = 0;
3786                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3787                 tv = &drawtimeout;
3788
3789                 dodraw = 0;
3790                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3791                         tsetdirtattr(ATTR_BLINK);
3792                         term.mode ^= MODE_BLINK;
3793                         lastblink = now;
3794                         dodraw = 1;
3795                 }
3796                 deltatime = TIMEDIFF(now, last);
3797                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3798                                 || deltatime < 0) {
3799                         dodraw = 1;
3800                         last = now;
3801                 }
3802
3803                 if(dodraw) {
3804                         while(XPending(xw.dpy)) {
3805                                 XNextEvent(xw.dpy, &ev);
3806                                 if(XFilterEvent(&ev, None))
3807                                         continue;
3808                                 if(handler[ev.type])
3809                                         (handler[ev.type])(&ev);
3810                         }
3811
3812                         draw();
3813                         XFlush(xw.dpy);
3814
3815                         if(xev && !FD_ISSET(xfd, &rfd))
3816                                 xev--;
3817                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3818                                 if(blinkset) {
3819                                         if(TIMEDIFF(now, lastblink) \
3820                                                         > blinktimeout) {
3821                                                 drawtimeout.tv_usec = 1;
3822                                         } else {
3823                                                 drawtimeout.tv_usec = (1000 * \
3824                                                         (blinktimeout - \
3825                                                         TIMEDIFF(now,
3826                                                                 lastblink)));
3827                                         }
3828                                 } else {
3829                                         tv = NULL;
3830                                 }
3831                         }
3832                 }
3833         }
3834 }
3835
3836 void
3837 usage(void) {
3838         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3839         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3840         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3841 }
3842
3843 int
3844 main(int argc, char *argv[]) {
3845         char *titles;
3846         uint cols = 80, rows = 24;
3847
3848         xw.l = xw.t = 0;
3849         xw.isfixed = False;
3850
3851         ARGBEGIN {
3852         case 'a':
3853                 allowaltscreen = false;
3854                 break;
3855         case 'c':
3856                 opt_class = EARGF(usage());
3857                 break;
3858         case 'e':
3859                 /* eat all remaining arguments */
3860                 if(argc > 1) {
3861                         opt_cmd = &argv[1];
3862                         if(argv[1] != NULL && opt_title == NULL) {
3863                                 titles = xstrdup(argv[1]);
3864                                 opt_title = basename(titles);
3865                         }
3866                 }
3867                 goto run;
3868         case 'f':
3869                 opt_font = EARGF(usage());
3870                 break;
3871         case 'g':
3872                 xw.gm = XParseGeometry(EARGF(usage()),
3873                                 &xw.l, &xw.t, &cols, &rows);
3874                 break;
3875         case 'i':
3876                 xw.isfixed = True;
3877                 break;
3878         case 'o':
3879                 opt_io = EARGF(usage());
3880                 break;
3881         case 't':
3882                 opt_title = EARGF(usage());
3883                 break;
3884         case 'w':
3885                 opt_embed = EARGF(usage());
3886                 break;
3887         case 'v':
3888         default:
3889                 usage();
3890         } ARGEND;
3891
3892 run:
3893         setlocale(LC_CTYPE, "");
3894         XSetLocaleModifiers("");
3895         tnew(cols? cols : 1, rows? rows : 1);
3896         xinit();
3897         selinit();
3898         run();
3899
3900         return 0;
3901 }
3902