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 <sys/ioctl.h>
  15 #include <sys/select.h>
  16 #include <sys/stat.h>
  17 #include <sys/time.h>
  18 #include <sys/types.h>
  19 #include <sys/wait.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22 #include <libgen.h>
  23 #include <X11/Xatom.h>
  24 #include <X11/Xlib.h>
  25 #include <X11/Xutil.h>
  26 #include <X11/cursorfont.h>
  27 #include <X11/keysym.h>
  28 #include <X11/Xft/Xft.h>
  29 #include <fontconfig/fontconfig.h>
  30 #include <wchar.h>
  31
  32 #include "arg.h"
  33
  34 char *argv0;
  35
  36 #define Glyph Glyph_
  37 #define Font Font_
  38 #define Draw XftDraw *
  39 #define Colour XftColor
  40 #define Colourmap Colormap
  41 #define Rectangle XRectangle
  42
  43 #if   defined(__linux)
  44  #include <pty.h>
  45 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  46  #include <util.h>
  47 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  48  #include <libutil.h>
  49 #endif
  50
  51
  52 /* XEMBED messages */
  53 #define XEMBED_FOCUS_IN  4
  54 #define XEMBED_FOCUS_OUT 5
  55
  56 /* Arbitrary sizes */
  57 #define UTF_SIZ       4
  58 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  59 #define ESC_ARG_SIZ   16
  60 #define STR_BUF_SIZ   ESC_BUF_SIZ
  61 #define STR_ARG_SIZ   ESC_ARG_SIZ
  62 #define DRAW_BUF_SIZ  20*1024
  63 #define XK_ANY_MOD    UINT_MAX
  64 #define XK_NO_MOD     0
  65 #define XK_SWITCH_MOD (1<<13)
  66
  67 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  68
  69 /* macros */
  70 #define SERRNO strerror(errno)
  71 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  72 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  73 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  74 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  75 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  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
  82 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  83 #define IS_TRUECOL(x)    (1 << 24 & (x))
  84 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  85 #define TRUEGREEN(x)     (((x) & 0xff00))
  86 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  87
  88
  89 #define VT102ID "\033[?6c"
  90
  91 enum glyph_attribute {
  92         ATTR_NULL      = 0,
  93         ATTR_REVERSE   = 1,
  94         ATTR_UNDERLINE = 2,
  95         ATTR_BOLD      = 4,
  96         ATTR_GFX       = 8,
  97         ATTR_ITALIC    = 16,
  98         ATTR_BLINK     = 32,
  99         ATTR_WRAP      = 64,
 100         ATTR_WIDE      = 128,
 101         ATTR_WDUMMY    = 256,
 102 };
 103
 104 enum cursor_movement {
 105         CURSOR_SAVE,
 106         CURSOR_LOAD
 107 };
 108
 109 enum cursor_state {
 110         CURSOR_DEFAULT  = 0,
 111         CURSOR_WRAPNEXT = 1,
 112         CURSOR_ORIGIN   = 2
 113 };
 114
 115 enum term_mode {
 116         MODE_WRAP        = 1,
 117         MODE_INSERT      = 2,
 118         MODE_APPKEYPAD   = 4,
 119         MODE_ALTSCREEN   = 8,
 120         MODE_CRLF        = 16,
 121         MODE_MOUSEBTN    = 32,
 122         MODE_MOUSEMOTION = 64,
 123         MODE_REVERSE     = 128,
 124         MODE_KBDLOCK     = 256,
 125         MODE_HIDE        = 512,
 126         MODE_ECHO        = 1024,
 127         MODE_APPCURSOR   = 2048,
 128         MODE_MOUSESGR    = 4096,
 129         MODE_8BIT        = 8192,
 130         MODE_BLINK       = 16384,
 131         MODE_FBLINK      = 32768,
 132         MODE_FOCUS       = 65536,
 133         MODE_MOUSEX10    = 131072,
 134         MODE_MOUSEMANY   = 262144,
 135         MODE_BRCKTPASTE  = 524288,
 136         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 137                           |MODE_MOUSEMANY,
 138 };
 139
 140 enum escape_state {
 141         ESC_START      = 1,
 142         ESC_CSI        = 2,
 143         ESC_STR        = 4,  /* DSC, OSC, PM, APC */
 144         ESC_ALTCHARSET = 8,
 145         ESC_STR_END    = 16, /* a final string was encountered */
 146         ESC_TEST       = 32, /* Enter in test mode */
 147 };
 148
 149 enum window_state {
 150         WIN_VISIBLE = 1,
 151         WIN_REDRAW  = 2,
 152         WIN_FOCUSED = 4
 153 };
 154
 155 enum selection_type {
 156         SEL_REGULAR = 1,
 157         SEL_RECTANGULAR = 2
 158 };
 159
 160 enum selection_snap {
 161         SNAP_WORD = 1,
 162         SNAP_LINE = 2
 163 };
 164
 165 typedef unsigned char uchar;
 166 typedef unsigned int uint;
 167 typedef unsigned long ulong;
 168 typedef unsigned short ushort;
 169
 170 typedef struct {
 171         char c[UTF_SIZ]; /* character code */
 172         ushort mode;      /* attribute flags */
 173         ulong fg;        /* foreground  */
 174         ulong bg;        /* background  */
 175 } Glyph;
 176
 177 typedef Glyph *Line;
 178
 179 typedef struct {
 180         Glyph attr; /* current char attributes */
 181         int x;
 182         int y;
 183         char state;
 184 } TCursor;
 185
 186 /* CSI Escape sequence structs */
 187 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 188 typedef struct {
 189         char buf[ESC_BUF_SIZ]; /* raw string */
 190         int len;               /* raw string length */
 191         char priv;
 192         int arg[ESC_ARG_SIZ];
 193         int narg;              /* nb of args */
 194         char mode;
 195 } CSIEscape;
 196
 197 /* STR Escape sequence structs */
 198 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 199 typedef struct {
 200         char type;             /* ESC type ... */
 201         char buf[STR_BUF_SIZ]; /* raw string */
 202         int len;               /* raw string length */
 203         char *args[STR_ARG_SIZ];
 204         int narg;              /* nb of args */
 205 } STREscape;
 206
 207 /* Internal representation of the screen */
 208 typedef struct {
 209         int row;      /* nb row */
 210         int col;      /* nb col */
 211         Line *line;   /* screen */
 212         Line *alt;    /* alternate screen */
 213         bool *dirty;  /* dirtyness of lines */
 214         TCursor c;    /* cursor */
 215         int top;      /* top    scroll limit */
 216         int bot;      /* bottom scroll limit */
 217         int mode;     /* terminal mode flags */
 218         int esc;      /* escape state flags */
 219         bool numlock; /* lock numbers in keyboard */
 220         bool *tabs;
 221 } Term;
 222
 223 /* Purely graphic info */
 224 typedef struct {
 225         Display *dpy;
 226         Colourmap cmap;
 227         Window win;
 228         Drawable buf;
 229         Atom xembed, wmdeletewin;
 230         XIM xim;
 231         XIC xic;
 232         Draw draw;
 233         Visual *vis;
 234         XSetWindowAttributes attrs;
 235         int scr;
 236         bool isfixed; /* is fixed geometry? */
 237         int fx, fy, fw, fh; /* fixed geometry */
 238         int tw, th; /* tty width and height */
 239         int w, h; /* window width and height */
 240         int ch; /* char height */
 241         int cw; /* char width  */
 242         char state; /* focus, redraw, visible */
 243 } XWindow;
 244
 245 typedef struct {
 246         int b;
 247         uint mask;
 248         char s[ESC_BUF_SIZ];
 249 } Mousekey;
 250
 251 typedef struct {
 252         KeySym k;
 253         uint mask;
 254         char s[ESC_BUF_SIZ];
 255         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 256         signed char appkey;    /* application keypad */
 257         signed char appcursor; /* application cursor */
 258         signed char crlf;      /* crlf mode          */
 259 } Key;
 260
 261 typedef struct {
 262         int mode;
 263         int type;
 264         int snap;
 265         /*
 266          * Selection variables:
 267          * nb – normalized coordinates of the beginning of the selection
 268          * ne – normalized coordinates of the end of the selection
 269          * ob – original coordinates of the beginning of the selection
 270          * oe – original coordinates of the end of the selection
 271          */
 272         struct {
 273                 int x, y;
 274         } nb, ne, ob, oe;
 275
 276         char *clip;
 277         Atom xtarget;
 278         bool alt;
 279         struct timeval tclick1;
 280         struct timeval tclick2;
 281 } Selection;
 282
 283 typedef union {
 284         int i;
 285         unsigned int ui;
 286         float f;
 287         const void *v;
 288 } Arg;
 289
 290 typedef struct {
 291         unsigned int mod;
 292         KeySym keysym;
 293         void (*func)(const Arg *);
 294         const Arg arg;
 295 } Shortcut;
 296
 297 /* function definitions used in config.h */
 298 static void clippaste(const Arg *);
 299 static void numlock(const Arg *);
 300 static void selpaste(const Arg *);
 301 static void xzoom(const Arg *);
 302
 303 /* Config.h for applying patches and the configuration. */
 304 #include "config.h"
 305
 306 /* Font structure */
 307 typedef struct {
 308         int height;
 309         int width;
 310         int ascent;
 311         int descent;
 312         short lbearing;
 313         short rbearing;
 314         XftFont *match;
 315         FcFontSet *set;
 316         FcPattern *pattern;
 317 } Font;
 318
 319 /* Drawing Context */
 320 typedef struct {
 321         Colour col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 322         Font font, bfont, ifont, ibfont;
 323         GC gc;
 324 } DC;
 325
 326 static void die(const char *, ...);
 327 static void draw(void);
 328 static void redraw(int);
 329 static void drawregion(int, int, int, int);
 330 static void execsh(void);
 331 static void sigchld(int);
 332 static void run(void);
 333
 334 static void csidump(void);
 335 static void csihandle(void);
 336 static void csiparse(void);
 337 static void csireset(void);
 338 static void strdump(void);
 339 static void strhandle(void);
 340 static void strparse(void);
 341 static void strreset(void);
 342
 343 static int tattrset(int);
 344 static void tclearregion(int, int, int, int);
 345 static void tcursor(int);
 346 static void tdeletechar(int);
 347 static void tdeleteline(int);
 348 static void tinsertblank(int);
 349 static void tinsertblankline(int);
 350 static void tmoveto(int, int);
 351 static void tmoveato(int x, int y);
 352 static void tnew(int, int);
 353 static void tnewline(int);
 354 static void tputtab(bool);
 355 static void tputc(char *, int);
 356 static void treset(void);
 357 static int tresize(int, int);
 358 static void tscrollup(int, int);
 359 static void tscrolldown(int, int);
 360 static void tsetattr(int*, int);
 361 static void tsetchar(char *, Glyph *, int, int);
 362 static void tsetscroll(int, int);
 363 static void tswapscreen(void);
 364 static void tsetdirt(int, int);
 365 static void tsetdirtattr(int);
 366 static void tsetmode(bool, bool, int *, int);
 367 static void tfulldirt(void);
 368 static void techo(char *, int);
 369 static long tdefcolor(int *, int *, int);
 370 static inline bool match(uint, uint);
 371 static void ttynew(void);
 372 static void ttyread(void);
 373 static void ttyresize(void);
 374 static void ttywrite(const char *, size_t);
 375
 376 static void xdraws(char *, Glyph, int, int, int, int);
 377 static void xhints(void);
 378 static void xclear(int, int, int, int);
 379 static void xdrawcursor(void);
 380 static void xinit(void);
 381 static void xloadcols(void);
 382 static int xsetcolorname(int, const char *);
 383 static int xloadfont(Font *, FcPattern *);
 384 static void xloadfonts(char *, int);
 385 static int xloadfontset(Font *);
 386 static void xsettitle(char *);
 387 static void xresettitle(void);
 388 static void xsetpointermotion(int);
 389 static void xseturgency(int);
 390 static void xsetsel(char*);
 391 static void xtermclear(int, int, int, int);
 392 static void xunloadfont(Font *f);
 393 static void xunloadfonts(void);
 394 static void xresize(int, int);
 395
 396 static void expose(XEvent *);
 397 static void visibility(XEvent *);
 398 static void unmap(XEvent *);
 399 static char *kmap(KeySym, uint);
 400 static void kpress(XEvent *);
 401 static void cmessage(XEvent *);
 402 static void cresize(int, int);
 403 static void resize(XEvent *);
 404 static void focus(XEvent *);
 405 static void brelease(XEvent *);
 406 static void bpress(XEvent *);
 407 static void bmotion(XEvent *);
 408 static void selnotify(XEvent *);
 409 static void selclear(XEvent *);
 410 static void selrequest(XEvent *);
 411
 412 static void selinit(void);
 413 static void selsort(void);
 414 static inline bool selected(int, int);
 415 static void selcopy(void);
 416 static void selscroll(int, int);
 417 static void selsnap(int, int *, int *, int);
 418
 419 static int utf8decode(char *, long *);
 420 static int utf8encode(long *, char *);
 421 static int utf8size(char *);
 422 static int isfullutf8(char *, int);
 423
 424 static ssize_t xwrite(int, char *, size_t);
 425 static void *xmalloc(size_t);
 426 static void *xrealloc(void *, size_t);
 427
 428 static void (*handler[LASTEvent])(XEvent *) = {
 429         [KeyPress] = kpress,
 430         [ClientMessage] = cmessage,
 431         [ConfigureNotify] = resize,
 432         [VisibilityNotify] = visibility,
 433         [UnmapNotify] = unmap,
 434         [Expose] = expose,
 435         [FocusIn] = focus,
 436         [FocusOut] = focus,
 437         [MotionNotify] = bmotion,
 438         [ButtonPress] = bpress,
 439         [ButtonRelease] = brelease,
 440         [SelectionClear] = selclear,
 441         [SelectionNotify] = selnotify,
 442         [SelectionRequest] = selrequest,
 443 };
 444
 445 /* Globals */
 446 static DC dc;
 447 static XWindow xw;
 448 static Term term;
 449 static CSIEscape csiescseq;
 450 static STREscape strescseq;
 451 static int cmdfd;
 452 static pid_t pid;
 453 static Selection sel;
 454 static int iofd = -1;
 455 static char **opt_cmd = NULL;
 456 static char *opt_io = NULL;
 457 static char *opt_title = NULL;
 458 static char *opt_embed = NULL;
 459 static char *opt_class = NULL;
 460 static char *opt_font = NULL;
 461 static int oldbutton = 3; /* button event on startup: 3 = release */
 462
 463 static char *usedfont = NULL;
 464 static int usedfontsize = 0;
 465
 466 /* Font Ring Cache */
 467 enum {
 468         FRC_NORMAL,
 469         FRC_ITALIC,
 470         FRC_BOLD,
 471         FRC_ITALICBOLD
 472 };
 473
 474 typedef struct {
 475         XftFont *font;
 476         int flags;
 477 } Fontcache;
 478
 479 /* Fontcache is an array now. A new font will be appended to the array. */
 480 static Fontcache frc[16];
 481 static int frclen = 0;
 482
 483 ssize_t
 484 xwrite(int fd, char *s, size_t len) {
 485         size_t aux = len;
 486
 487         while(len > 0) {
 488                 ssize_t r = write(fd, s, len);
 489                 if(r < 0)
 490                         return r;
 491                 len -= r;
 492                 s += r;
 493         }
 494         return aux;
 495 }
 496
 497 void *
 498 xmalloc(size_t len) {
 499         void *p = malloc(len);
 500
 501         if(!p)
 502                 die("Out of memory\n");
 503
 504         return p;
 505 }
 506
 507 void *
 508 xrealloc(void *p, size_t len) {
 509         if((p = realloc(p, len)) == NULL)
 510                 die("Out of memory\n");
 511
 512         return p;
 513 }
 514
 515 int
 516 utf8decode(char *s, long *u) {
 517         uchar c;
 518         int i, n, rtn;
 519
 520         rtn = 1;
 521         c = *s;
 522         if(~c & 0x80) { /* 0xxxxxxx */
 523                 *u = c;
 524                 return rtn;
 525         } else if((c & 0xE0) == 0xC0) { /* 110xxxxx */
 526                 *u = c & 0x1F;
 527                 n = 1;
 528         } else if((c & 0xF0) == 0xE0) { /* 1110xxxx */
 529                 *u = c & 0x0F;
 530                 n = 2;
 531         } else if((c & 0xF8) == 0xF0) { /* 11110xxx */
 532                 *u = c & 0x07;
 533                 n = 3;
 534         } else {
 535                 goto invalid;
 536         }
 537
 538         for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
 539                 c = *s;
 540                 if((c & 0xC0) != 0x80) /* 10xxxxxx */
 541                         goto invalid;
 542                 *u <<= 6;
 543                 *u |= c & 0x3F;
 544         }
 545
 546         if((n == 1 && *u < 0x80) ||
 547            (n == 2 && *u < 0x800) ||
 548            (n == 3 && *u < 0x10000) ||
 549            (*u >= 0xD800 && *u <= 0xDFFF)) {
 550                 goto invalid;
 551         }
 552
 553         return rtn;
 554 invalid:
 555         *u = 0xFFFD;
 556
 557         return rtn;
 558 }
 559
 560 int
 561 utf8encode(long *u, char *s) {
 562         uchar *sp;
 563         ulong uc;
 564         int i, n;
 565
 566         sp = (uchar *)s;
 567         uc = *u;
 568         if(uc < 0x80) {
 569                 *sp = uc; /* 0xxxxxxx */
 570                 return 1;
 571         } else if(*u < 0x800) {
 572                 *sp = (uc >> 6) | 0xC0; /* 110xxxxx */
 573                 n = 1;
 574         } else if(uc < 0x10000) {
 575                 *sp = (uc >> 12) | 0xE0; /* 1110xxxx */
 576                 n = 2;
 577         } else if(uc <= 0x10FFFF) {
 578                 *sp = (uc >> 18) | 0xF0; /* 11110xxx */
 579                 n = 3;
 580         } else {
 581                 goto invalid;
 582         }
 583
 584         for(i=n,++sp; i>0; --i,++sp)
 585                 *sp = ((uc >> 6*(i-1)) & 0x3F) | 0x80; /* 10xxxxxx */
 586
 587         return n+1;
 588 invalid:
 589         /* U+FFFD */
 590         *s++ = '\xEF';
 591         *s++ = '\xBF';
 592         *s = '\xBD';
 593
 594         return 3;
 595 }
 596
 597 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 598    UTF-8 otherwise return 0 */
 599 int
 600 isfullutf8(char *s, int b) {
 601         uchar *c1, *c2, *c3;
 602
 603         c1 = (uchar *)s;
 604         c2 = (uchar *)++s;
 605         c3 = (uchar *)++s;
 606         if(b < 1) {
 607                 return 0;
 608         } else if((*c1 & 0xE0) == 0xC0 && b == 1) {
 609                 return 0;
 610         } else if((*c1 & 0xF0) == 0xE0 &&
 611             ((b == 1) ||
 612             ((b == 2) && (*c2 & 0xC0) == 0x80))) {
 613                 return 0;
 614         } else if((*c1 & 0xF8) == 0xF0 &&
 615             ((b == 1) ||
 616             ((b == 2) && (*c2 & 0xC0) == 0x80) ||
 617             ((b == 3) && (*c2 & 0xC0) == 0x80 && (*c3 & 0xC0) == 0x80))) {
 618                 return 0;
 619         } else {
 620                 return 1;
 621         }
 622 }
 623
 624 int
 625 utf8size(char *s) {
 626         uchar c = *s;
 627
 628         if(~c & 0x80) {
 629                 return 1;
 630         } else if((c & 0xE0) == 0xC0) {
 631                 return 2;
 632         } else if((c & 0xF0) == 0xE0) {
 633                 return 3;
 634         } else {
 635                 return 4;
 636         }
 637 }
 638
 639 static void
 640 selinit(void) {
 641         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 642         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 643         sel.mode = 0;
 644         sel.ob.x = -1;
 645         sel.clip = NULL;
 646         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 647         if(sel.xtarget == None)
 648                 sel.xtarget = XA_STRING;
 649 }
 650
 651 static int
 652 x2col(int x) {
 653         x -= borderpx;
 654         x /= xw.cw;
 655
 656         return LIMIT(x, 0, term.col-1);
 657 }
 658
 659 static int
 660 y2row(int y) {
 661         y -= borderpx;
 662         y /= xw.ch;
 663
 664         return LIMIT(y, 0, term.row-1);
 665 }
 666
 667 static void
 668 selsort(void) {
 669         if(sel.ob.y == sel.oe.y) {
 670                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 671                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 672         } else {
 673                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 674                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 675         }
 676         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 677         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 678 }
 679
 680 static inline bool
 681 selected(int x, int y) {
 682         if(sel.ne.y == y && sel.nb.y == y)
 683                 return BETWEEN(x, sel.nb.x, sel.ne.x);
 684
 685         if(sel.type == SEL_RECTANGULAR) {
 686                 return ((sel.nb.y <= y && y <= sel.ne.y)
 687                         && (sel.nb.x <= x && x <= sel.ne.x));
 688         }
 689
 690         return ((sel.nb.y < y && y < sel.ne.y)
 691                 || (y == sel.ne.y && x <= sel.ne.x))
 692                 || (y == sel.nb.y && x >= sel.nb.x
 693                         && (x <= sel.ne.x || sel.nb.y != sel.ne.y));
 694 }
 695
 696 void
 697 selsnap(int mode, int *x, int *y, int direction) {
 698         int i;
 699
 700         switch(mode) {
 701         case SNAP_WORD:
 702                 /*
 703                  * Snap around if the word wraps around at the end or
 704                  * beginning of a line.
 705                  */
 706                 for(;;) {
 707                         if(direction < 0 && *x <= 0) {
 708                                 if(*y > 0 && term.line[*y - 1][term.col-1].mode
 709                                                 & ATTR_WRAP) {
 710                                         *y -= 1;
 711                                         *x = term.col-1;
 712                                 } else {
 713                                         break;
 714                                 }
 715                         }
 716                         if(direction > 0 && *x >= term.col-1) {
 717                                 if(*y < term.row-1 && term.line[*y][*x].mode
 718                                                 & ATTR_WRAP) {
 719                                         *y += 1;
 720                                         *x = 0;
 721                                 } else {
 722                                         break;
 723                                 }
 724                         }
 725
 726                         if(term.line[*y][*x+direction].mode & ATTR_WDUMMY) {
 727                                 *x += direction;
 728                                 continue;
 729                         }
 730
 731                         if(strchr(worddelimiters,
 732                                         term.line[*y][*x+direction].c[0])) {
 733                                 break;
 734                         }
 735
 736                         *x += direction;
 737                 }
 738                 break;
 739         case SNAP_LINE:
 740                 /*
 741                  * Snap around if the the previous line or the current one
 742                  * has set ATTR_WRAP at its end. Then the whole next or
 743                  * previous line will be selected.
 744                  */
 745                 *x = (direction < 0) ? 0 : term.col - 1;
 746                 if(direction < 0 && *y > 0) {
 747                         for(; *y > 0; *y += direction) {
 748                                 if(!(term.line[*y-1][term.col-1].mode
 749                                                 & ATTR_WRAP)) {
 750                                         break;
 751                                 }
 752                         }
 753                 } else if(direction > 0 && *y < term.row-1) {
 754                         for(; *y < term.row; *y += direction) {
 755                                 if(!(term.line[*y][term.col-1].mode
 756                                                 & ATTR_WRAP)) {
 757                                         break;
 758                                 }
 759                         }
 760                 }
 761                 break;
 762         default:
 763                 /*
 764                  * Select the whole line when the end of line is reached.
 765                  */
 766                 if(direction > 0) {
 767                         i = term.col;
 768                         while(--i > 0 && term.line[*y][i].c[0] == ' ')
 769                                 /* nothing */;
 770                         if(i > 0 && i < *x)
 771                                 *x = term.col - 1;
 772                 }
 773                 break;
 774         }
 775 }
 776
 777 void
 778 getbuttoninfo(XEvent *e) {
 779         int type;
 780         uint state = e->xbutton.state &~Button1Mask;
 781
 782         sel.alt = IS_SET(MODE_ALTSCREEN);
 783
 784         sel.oe.x = x2col(e->xbutton.x);
 785         sel.oe.y = y2row(e->xbutton.y);
 786
 787         if(sel.ob.y < sel.oe.y
 788                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 789                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 790                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 791         } else {
 792                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 793                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 794         }
 795         selsort();
 796
 797         sel.type = SEL_REGULAR;
 798         for(type = 1; type < LEN(selmasks); ++type) {
 799                 if(match(selmasks[type], state)) {
 800                         sel.type = type;
 801                         break;
 802                 }
 803         }
 804 }
 805
 806 void
 807 mousereport(XEvent *e) {
 808         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 809             button = e->xbutton.button, state = e->xbutton.state,
 810             len;
 811         char buf[40];
 812         static int ox, oy;
 813
 814         /* from urxvt */
 815         if(e->xbutton.type == MotionNotify) {
 816                 if(x == ox && y == oy)
 817                         return;
 818                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 819                         return;
 820                 /* MOUSE_MOTION: no reporting if no button is pressed */
 821                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 822                         return;
 823
 824                 button = oldbutton + 32;
 825                 ox = x;
 826                 oy = y;
 827         } else {
 828                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 829                         button = 3;
 830                 } else {
 831                         button -= Button1;
 832                         if(button >= 3)
 833                                 button += 64 - 3;
 834                 }
 835                 if(e->xbutton.type == ButtonPress) {
 836                         oldbutton = button;
 837                         ox = x;
 838                         oy = y;
 839                 } else if(e->xbutton.type == ButtonRelease) {
 840                         oldbutton = 3;
 841                         /* MODE_MOUSEX10: no button release reporting */
 842                         if(IS_SET(MODE_MOUSEX10))
 843                                 return;
 844                 }
 845         }
 846
 847         if(!IS_SET(MODE_MOUSEX10)) {
 848                 button += (state & ShiftMask   ? 4  : 0)
 849                         + (state & Mod4Mask    ? 8  : 0)
 850                         + (state & ControlMask ? 16 : 0);
 851         }
 852
 853         len = 0;
 854         if(IS_SET(MODE_MOUSESGR)) {
 855                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 856                                 button, x+1, y+1,
 857                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 858         } else if(x < 223 && y < 223) {
 859                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 860                                 32+button, 32+x+1, 32+y+1);
 861         } else {
 862                 return;
 863         }
 864
 865         ttywrite(buf, len);
 866 }
 867
 868 void
 869 bpress(XEvent *e) {
 870         struct timeval now;
 871         Mousekey *mk;
 872
 873         if(IS_SET(MODE_MOUSE)) {
 874                 mousereport(e);
 875                 return;
 876         }
 877
 878         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 879                 if(e->xbutton.button == mk->b
 880                                 && match(mk->mask, e->xbutton.state)) {
 881                         ttywrite(mk->s, strlen(mk->s));
 882                         if(IS_SET(MODE_ECHO))
 883                                 techo(mk->s, strlen(mk->s));
 884                         return;
 885                 }
 886         }
 887
 888         if(e->xbutton.button == Button1) {
 889                 gettimeofday(&now, NULL);
 890
 891                 /* Clear previous selection, logically and visually. */
 892                 selclear(NULL);
 893                 sel.mode = 1;
 894                 sel.type = SEL_REGULAR;
 895                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 896                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 897
 898                 /*
 899                  * If the user clicks below predefined timeouts specific
 900                  * snapping behaviour is exposed.
 901                  */
 902                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 903                         sel.snap = SNAP_LINE;
 904                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 905                         sel.snap = SNAP_WORD;
 906                 } else {
 907                         sel.snap = 0;
 908                 }
 909                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 910                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 911                 selsort();
 912
 913                 /*
 914                  * Draw selection, unless it's regular and we don't want to
 915                  * make clicks visible
 916                  */
 917                 if(sel.snap != 0) {
 918                         sel.mode++;
 919                         tsetdirt(sel.nb.y, sel.ne.y);
 920                 }
 921                 sel.tclick2 = sel.tclick1;
 922                 sel.tclick1 = now;
 923         }
 924 }
 925
 926 void
 927 selcopy(void) {
 928         char *str, *ptr;
 929         int x, y, bufsize, size, i, ex;
 930         Glyph *gp, *last;
 931
 932         if(sel.ob.x == -1) {
 933                 str = NULL;
 934         } else {
 935                 bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 936                 ptr = str = xmalloc(bufsize);
 937
 938                 /* append every set & selected glyph to the selection */
 939                 for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 940                         gp = &term.line[y][0];
 941                         last = gp + term.col;
 942
 943                         while(--last >= gp && !(selected(last - gp, y) && \
 944                                                 strcmp(last->c, " ") != 0))
 945                                 /* nothing */;
 946
 947                         for(x = 0; gp <= last; x++, ++gp) {
 948                                 if(!selected(x, y) || (gp->mode & ATTR_WDUMMY))
 949                                         continue;
 950
 951                                 size = utf8size(gp->c);
 952                                 memcpy(ptr, gp->c, size);
 953                                 ptr += size;
 954                         }
 955
 956                         /*
 957                          * Copy and pasting of line endings is inconsistent
 958                          * in the inconsistent terminal and GUI world.
 959                          * The best solution seems like to produce '\n' when
 960                          * something is copied from st and convert '\n' to
 961                          * '\r', when something to be pasted is received by
 962                          * st.
 963                          * FIXME: Fix the computer world.
 964                          */
 965                         if(y < sel.ne.y && x > 0 && !((gp-1)->mode & ATTR_WRAP))
 966                                 *ptr++ = '\n';
 967
 968                         /*
 969                          * If the last selected line expands in the selection
 970                          * after the visible text '\n' is appended.
 971                          */
 972                         if(y == sel.ne.y) {
 973                                 i = term.col;
 974                                 while(--i > 0 && term.line[y][i].c[0] == ' ')
 975                                         /* nothing */;
 976                                 ex = sel.ne.x;
 977                                 if(sel.nb.y == sel.ne.y && sel.ne.x < sel.nb.x)
 978                                         ex = sel.nb.x;
 979                                 if(i < ex)
 980                                         *ptr++ = '\n';
 981                         }
 982                 }
 983                 *ptr = 0;
 984         }
 985         xsetsel(str);
 986 }
 987
 988 void
 989 selnotify(XEvent *e) {
 990         ulong nitems, ofs, rem;
 991         int format;
 992         uchar *data, *last, *repl;
 993         Atom type;
 994
 995         ofs = 0;
 996         do {
 997                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 998                                         False, AnyPropertyType, &type, &format,
 999                                         &nitems, &rem, &data)) {
1000                         fprintf(stderr, "Clipboard allocation failed\n");
1001                         return;
1002                 }
1003
1004                 /*
1005                  * As seen in selcopy:
1006                  * Line endings are inconsistent in the terminal and GUI world
1007                  * copy and pasting. When receiving some selection data,
1008                  * replace all '\n' with '\r'.
1009                  * FIXME: Fix the computer world.
1010                  */
1011                 repl = data;
1012                 last = data + nitems * format / 8;
1013                 while((repl = memchr(repl, '\n', last - repl))) {
1014                         *repl++ = '\r';
1015                 }
1016
1017                 if(IS_SET(MODE_BRCKTPASTE))
1018                         ttywrite("\033[200~", 6);
1019                 ttywrite((const char *)data, nitems * format / 8);
1020                 if(IS_SET(MODE_BRCKTPASTE))
1021                         ttywrite("\033[201~", 6);
1022                 XFree(data);
1023                 /* number of 32-bit chunks returned */
1024                 ofs += nitems * format / 32;
1025         } while(rem > 0);
1026 }
1027
1028 void
1029 selpaste(const Arg *dummy) {
1030         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1031                         xw.win, CurrentTime);
1032 }
1033
1034 void
1035 clippaste(const Arg *dummy) {
1036         Atom clipboard;
1037
1038         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1039         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1040                         xw.win, CurrentTime);
1041 }
1042
1043 void
1044 selclear(XEvent *e) {
1045         if(sel.ob.x == -1)
1046                 return;
1047         sel.ob.x = -1;
1048         tsetdirt(sel.nb.y, sel.ne.y);
1049 }
1050
1051 void
1052 selrequest(XEvent *e) {
1053         XSelectionRequestEvent *xsre;
1054         XSelectionEvent xev;
1055         Atom xa_targets, string;
1056
1057         xsre = (XSelectionRequestEvent *) e;
1058         xev.type = SelectionNotify;
1059         xev.requestor = xsre->requestor;
1060         xev.selection = xsre->selection;
1061         xev.target = xsre->target;
1062         xev.time = xsre->time;
1063         /* reject */
1064         xev.property = None;
1065
1066         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1067         if(xsre->target == xa_targets) {
1068                 /* respond with the supported type */
1069                 string = sel.xtarget;
1070                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1071                                 XA_ATOM, 32, PropModeReplace,
1072                                 (uchar *) &string, 1);
1073                 xev.property = xsre->property;
1074         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1075                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1076                                 xsre->target, 8, PropModeReplace,
1077                                 (uchar *) sel.clip, strlen(sel.clip));
1078                 xev.property = xsre->property;
1079         }
1080
1081         /* all done, send a notification to the listener */
1082         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1083                 fprintf(stderr, "Error sending SelectionNotify event\n");
1084 }
1085
1086 void
1087 xsetsel(char *str) {
1088         /* register the selection for both the clipboard and the primary */
1089         Atom clipboard;
1090
1091         free(sel.clip);
1092         sel.clip = str;
1093
1094         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1095
1096         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1097         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1098 }
1099
1100 void
1101 brelease(XEvent *e) {
1102         if(IS_SET(MODE_MOUSE)) {
1103                 mousereport(e);
1104                 return;
1105         }
1106
1107         if(e->xbutton.button == Button2) {
1108                 selpaste(NULL);
1109         } else if(e->xbutton.button == Button1) {
1110                 if(sel.mode < 2) {
1111                         selclear(NULL);
1112                 } else {
1113                         getbuttoninfo(e);
1114                         selcopy();
1115                 }
1116                 sel.mode = 0;
1117                 tsetdirt(sel.nb.y, sel.ne.y);
1118         }
1119 }
1120
1121 void
1122 bmotion(XEvent *e) {
1123         int oldey, oldex, oldsby, oldsey;
1124
1125         if(IS_SET(MODE_MOUSE)) {
1126                 mousereport(e);
1127                 return;
1128         }
1129
1130         if(!sel.mode)
1131                 return;
1132
1133         sel.mode++;
1134         oldey = sel.oe.y;
1135         oldex = sel.oe.x;
1136         oldsby = sel.nb.y;
1137         oldsey = sel.ne.y;
1138         getbuttoninfo(e);
1139
1140         if(oldey != sel.oe.y || oldex != sel.oe.x)
1141                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1142 }
1143
1144 void
1145 die(const char *errstr, ...) {
1146         va_list ap;
1147
1148         va_start(ap, errstr);
1149         vfprintf(stderr, errstr, ap);
1150         va_end(ap);
1151         exit(EXIT_FAILURE);
1152 }
1153
1154 void
1155 execsh(void) {
1156         char **args;
1157         char *envshell = getenv("SHELL");
1158         const struct passwd *pass = getpwuid(getuid());
1159         char buf[sizeof(long) * 8 + 1];
1160
1161         unsetenv("COLUMNS");
1162         unsetenv("LINES");
1163         unsetenv("TERMCAP");
1164
1165         if(pass) {
1166                 setenv("LOGNAME", pass->pw_name, 1);
1167                 setenv("USER", pass->pw_name, 1);
1168                 setenv("SHELL", pass->pw_shell, 0);
1169                 setenv("HOME", pass->pw_dir, 0);
1170         }
1171
1172         snprintf(buf, sizeof(buf), "%lu", xw.win);
1173         setenv("WINDOWID", buf, 1);
1174
1175         signal(SIGCHLD, SIG_DFL);
1176         signal(SIGHUP, SIG_DFL);
1177         signal(SIGINT, SIG_DFL);
1178         signal(SIGQUIT, SIG_DFL);
1179         signal(SIGTERM, SIG_DFL);
1180         signal(SIGALRM, SIG_DFL);
1181
1182         DEFAULT(envshell, shell);
1183         setenv("TERM", termname, 1);
1184         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
1185         execvp(args[0], args);
1186         exit(EXIT_FAILURE);
1187 }
1188
1189 void
1190 sigchld(int a) {
1191         int stat = 0;
1192
1193         if(waitpid(pid, &stat, 0) < 0)
1194                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
1195
1196         if(WIFEXITED(stat)) {
1197                 exit(WEXITSTATUS(stat));
1198         } else {
1199                 exit(EXIT_FAILURE);
1200         }
1201 }
1202
1203 void
1204 ttynew(void) {
1205         int m, s;
1206         struct winsize w = {term.row, term.col, 0, 0};
1207
1208         /* seems to work fine on linux, openbsd and freebsd */
1209         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1210                 die("openpty failed: %s\n", SERRNO);
1211
1212         switch(pid = fork()) {
1213         case -1:
1214                 die("fork failed\n");
1215                 break;
1216         case 0:
1217                 setsid(); /* create a new process group */
1218                 dup2(s, STDIN_FILENO);
1219                 dup2(s, STDOUT_FILENO);
1220                 dup2(s, STDERR_FILENO);
1221                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1222                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
1223                 close(s);
1224                 close(m);
1225                 execsh();
1226                 break;
1227         default:
1228                 close(s);
1229                 cmdfd = m;
1230                 signal(SIGCHLD, sigchld);
1231                 if(opt_io) {
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         }
1241 }
1242
1243 void
1244 dump(char c) {
1245         static int col;
1246
1247         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
1248         if(++col % 10 == 0)
1249                 fprintf(stderr, "\n");
1250 }
1251
1252 void
1253 ttyread(void) {
1254         static char buf[BUFSIZ];
1255         static int buflen = 0;
1256         char *ptr;
1257         char s[UTF_SIZ];
1258         int charsize; /* size of utf8 char in bytes */
1259         long utf8c;
1260         int ret;
1261
1262         /* append read bytes to unprocessed bytes */
1263         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1264                 die("Couldn't read from shell: %s\n", SERRNO);
1265
1266         /* process every complete utf8 char */
1267         buflen += ret;
1268         ptr = buf;
1269         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
1270                 charsize = utf8decode(ptr, &utf8c);
1271                 utf8encode(&utf8c, s);
1272                 tputc(s, charsize);
1273                 ptr += charsize;
1274                 buflen -= charsize;
1275         }
1276
1277         /* keep any uncomplete utf8 char for the next call */
1278         memmove(buf, ptr, buflen);
1279 }
1280
1281 void
1282 ttywrite(const char *s, size_t n) {
1283         if(write(cmdfd, s, n) == -1)
1284                 die("write error on tty: %s\n", SERRNO);
1285 }
1286
1287 void
1288 ttyresize(void) {
1289         struct winsize w;
1290
1291         w.ws_row = term.row;
1292         w.ws_col = term.col;
1293         w.ws_xpixel = xw.tw;
1294         w.ws_ypixel = xw.th;
1295         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1296                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
1297 }
1298
1299 int
1300 tattrset(int attr) {
1301         int i, j;
1302
1303         for(i = 0; i < term.row-1; i++) {
1304                 for(j = 0; j < term.col-1; j++) {
1305                         if(term.line[i][j].mode & attr)
1306                                 return 1;
1307                 }
1308         }
1309
1310         return 0;
1311 }
1312
1313 void
1314 tsetdirt(int top, int bot) {
1315         int i;
1316
1317         LIMIT(top, 0, term.row-1);
1318         LIMIT(bot, 0, term.row-1);
1319
1320         for(i = top; i <= bot; i++)
1321                 term.dirty[i] = 1;
1322 }
1323
1324 void
1325 tsetdirtattr(int attr) {
1326         int i, j;
1327
1328         for(i = 0; i < term.row-1; i++) {
1329                 for(j = 0; j < term.col-1; j++) {
1330                         if(term.line[i][j].mode & attr) {
1331                                 tsetdirt(i, i);
1332                                 break;
1333                         }
1334                 }
1335         }
1336 }
1337
1338 void
1339 tfulldirt(void) {
1340         tsetdirt(0, term.row-1);
1341 }
1342
1343 void
1344 tcursor(int mode) {
1345         static TCursor c[2];
1346         bool alt = IS_SET(MODE_ALTSCREEN);
1347
1348         if(mode == CURSOR_SAVE) {
1349                 c[alt] = term.c;
1350         } else if(mode == CURSOR_LOAD) {
1351                 term.c = c[alt];
1352                 tmoveto(c[alt].x, c[alt].y);
1353         }
1354 }
1355
1356 void
1357 treset(void) {
1358         uint i;
1359
1360         term.c = (TCursor){{
1361                 .mode = ATTR_NULL,
1362                 .fg = defaultfg,
1363                 .bg = defaultbg
1364         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1365
1366         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1367         for(i = tabspaces; i < term.col; i += tabspaces)
1368                 term.tabs[i] = 1;
1369         term.top = 0;
1370         term.bot = term.row - 1;
1371         term.mode = MODE_WRAP;
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         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1405
1406         for(i = term.bot; i >= orig+n; i--) {
1407                 temp = term.line[i];
1408                 term.line[i] = term.line[i-n];
1409                 term.line[i-n] = temp;
1410
1411                 term.dirty[i] = 1;
1412                 term.dirty[i-n] = 1;
1413         }
1414
1415         selscroll(orig, n);
1416 }
1417
1418 void
1419 tscrollup(int orig, int n) {
1420         int i;
1421         Line temp;
1422         LIMIT(n, 0, term.bot-orig+1);
1423
1424         tclearregion(0, orig, term.col-1, orig+n-1);
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                  term.dirty[i] = 1;
1432                  term.dirty[i+n] = 1;
1433         }
1434
1435         selscroll(orig, -n);
1436 }
1437
1438 void
1439 selscroll(int orig, int n) {
1440         if(sel.ob.x == -1)
1441                 return;
1442
1443         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1444                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1445                         selclear(NULL);
1446                         return;
1447                 }
1448                 if(sel.type == SEL_RECTANGULAR) {
1449                         if(sel.ob.y < term.top)
1450                                 sel.ob.y = term.top;
1451                         if(sel.oe.y > term.bot)
1452                                 sel.oe.y = term.bot;
1453                 } else {
1454                         if(sel.ob.y < term.top) {
1455                                 sel.ob.y = term.top;
1456                                 sel.ob.x = 0;
1457                         }
1458                         if(sel.oe.y > term.bot) {
1459                                 sel.oe.y = term.bot;
1460                                 sel.oe.x = term.col;
1461                         }
1462                 }
1463                 selsort();
1464         }
1465 }
1466
1467 void
1468 tnewline(int first_col) {
1469         int y = term.c.y;
1470
1471         if(y == term.bot) {
1472                 tscrollup(term.top, 1);
1473         } else {
1474                 y++;
1475         }
1476         tmoveto(first_col ? 0 : term.c.x, y);
1477 }
1478
1479 void
1480 csiparse(void) {
1481         char *p = csiescseq.buf, *np;
1482         long int v;
1483
1484         csiescseq.narg = 0;
1485         if(*p == '?') {
1486                 csiescseq.priv = 1;
1487                 p++;
1488         }
1489
1490         csiescseq.buf[csiescseq.len] = '\0';
1491         while(p < csiescseq.buf+csiescseq.len) {
1492                 np = NULL;
1493                 v = strtol(p, &np, 10);
1494                 if(np == p)
1495                         v = 0;
1496                 if(v == LONG_MAX || v == LONG_MIN)
1497                         v = -1;
1498                 csiescseq.arg[csiescseq.narg++] = v;
1499                 p = np;
1500                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1501                         break;
1502                 p++;
1503         }
1504         csiescseq.mode = *p;
1505 }
1506
1507 /* for absolute user moves, when decom is set */
1508 void
1509 tmoveato(int x, int y) {
1510         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1511 }
1512
1513 void
1514 tmoveto(int x, int y) {
1515         int miny, maxy;
1516
1517         if(term.c.state & CURSOR_ORIGIN) {
1518                 miny = term.top;
1519                 maxy = term.bot;
1520         } else {
1521                 miny = 0;
1522                 maxy = term.row - 1;
1523         }
1524         LIMIT(x, 0, term.col-1);
1525         LIMIT(y, miny, maxy);
1526         term.c.state &= ~CURSOR_WRAPNEXT;
1527         term.c.x = x;
1528         term.c.y = y;
1529 }
1530
1531 void
1532 tsetchar(char *c, Glyph *attr, int x, int y) {
1533         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1534                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1535                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1536                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1537                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1538                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1539                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1540                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1541                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1542         };
1543
1544         /*
1545          * The table is proudly stolen from rxvt.
1546          */
1547         if(attr->mode & ATTR_GFX) {
1548                 if(c[0] >= 0x41 && c[0] <= 0x7e
1549                                 && vt100_0[c[0] - 0x41]) {
1550                         c = vt100_0[c[0] - 0x41];
1551                 }
1552         }
1553
1554         if(term.line[y][x].mode & ATTR_WIDE) {
1555                 if(x+1 < term.col) {
1556                         term.line[y][x+1].c[0] = ' ';
1557                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1558                 }
1559         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1560                 term.line[y][x-1].c[0] = ' ';
1561                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1562         }
1563
1564         term.dirty[y] = 1;
1565         term.line[y][x] = *attr;
1566         memcpy(term.line[y][x].c, c, UTF_SIZ);
1567 }
1568
1569 void
1570 tclearregion(int x1, int y1, int x2, int y2) {
1571         int x, y, temp;
1572
1573         if(x1 > x2)
1574                 temp = x1, x1 = x2, x2 = temp;
1575         if(y1 > y2)
1576                 temp = y1, y1 = y2, y2 = temp;
1577
1578         LIMIT(x1, 0, term.col-1);
1579         LIMIT(x2, 0, term.col-1);
1580         LIMIT(y1, 0, term.row-1);
1581         LIMIT(y2, 0, term.row-1);
1582
1583         for(y = y1; y <= y2; y++) {
1584                 term.dirty[y] = 1;
1585                 for(x = x1; x <= x2; x++) {
1586                         if(selected(x, y))
1587                                 selclear(NULL);
1588                         term.line[y][x] = term.c.attr;
1589                         memcpy(term.line[y][x].c, " ", 2);
1590                 }
1591         }
1592 }
1593
1594 void
1595 tdeletechar(int n) {
1596         int src = term.c.x + n;
1597         int dst = term.c.x;
1598         int size = term.col - src;
1599
1600         term.dirty[term.c.y] = 1;
1601
1602         if(src >= term.col) {
1603                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1604                 return;
1605         }
1606
1607         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1608                         size * sizeof(Glyph));
1609         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1610 }
1611
1612 void
1613 tinsertblank(int n) {
1614         int src = term.c.x;
1615         int dst = src + n;
1616         int size = term.col - dst;
1617
1618         term.dirty[term.c.y] = 1;
1619
1620         if(dst >= term.col) {
1621                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1622                 return;
1623         }
1624
1625         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1626                         size * sizeof(Glyph));
1627         tclearregion(src, term.c.y, dst - 1, term.c.y);
1628 }
1629
1630 void
1631 tinsertblankline(int n) {
1632         if(term.c.y < term.top || term.c.y > term.bot)
1633                 return;
1634
1635         tscrolldown(term.c.y, n);
1636 }
1637
1638 void
1639 tdeleteline(int n) {
1640         if(term.c.y < term.top || term.c.y > term.bot)
1641                 return;
1642
1643         tscrollup(term.c.y, n);
1644 }
1645
1646 long
1647 tdefcolor(int *attr, int *npar, int l) {
1648         long idx = -1;
1649         uint r, g, b;
1650
1651         switch (attr[*npar + 1]) {
1652         case 2: /* direct colour in RGB space */
1653                 if (*npar + 4 >= l) {
1654                         fprintf(stderr,
1655                                 "erresc(38): Incorrect number of parameters (%d)\n",
1656                                 *npar);
1657                         break;
1658                 }
1659                 r = attr[*npar + 2];
1660                 g = attr[*npar + 3];
1661                 b = attr[*npar + 4];
1662                 *npar += 4;
1663                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1664                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1665                                 r, g, b);
1666                 else
1667                         idx = TRUECOLOR(r, g, b);
1668                 break;
1669         case 5: /* indexed colour */
1670                 if (*npar + 2 >= l) {
1671                         fprintf(stderr,
1672                                 "erresc(38): Incorrect number of parameters (%d)\n",
1673                                 *npar);
1674                         break;
1675                 }
1676                 *npar += 2;
1677                 if(!BETWEEN(attr[*npar], 0, 255))
1678                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1679                 else
1680                         idx = attr[*npar];
1681                 break;
1682         case 0: /* implemented defined (only foreground) */
1683         case 1: /* transparent */
1684         case 3: /* direct colour in CMY space */
1685         case 4: /* direct colour in CMYK space */
1686         default:
1687                 fprintf(stderr,
1688                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1689         }
1690
1691         return idx;
1692 }
1693
1694 void
1695 tsetattr(int *attr, int l) {
1696         int i;
1697         long idx;
1698
1699         for(i = 0; i < l; i++) {
1700                 switch(attr[i]) {
1701                 case 0:
1702                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE \
1703                                         | ATTR_BOLD | ATTR_ITALIC \
1704                                         | ATTR_BLINK);
1705                         term.c.attr.fg = defaultfg;
1706                         term.c.attr.bg = defaultbg;
1707                         break;
1708                 case 1:
1709                         term.c.attr.mode |= ATTR_BOLD;
1710                         break;
1711                 case 3:
1712                         term.c.attr.mode |= ATTR_ITALIC;
1713                         break;
1714                 case 4:
1715                         term.c.attr.mode |= ATTR_UNDERLINE;
1716                         break;
1717                 case 5: /* slow blink */
1718                 case 6: /* rapid blink */
1719                         term.c.attr.mode |= ATTR_BLINK;
1720                         break;
1721                 case 7:
1722                         term.c.attr.mode |= ATTR_REVERSE;
1723                         break;
1724                 case 21:
1725                 case 22:
1726                         term.c.attr.mode &= ~ATTR_BOLD;
1727                         break;
1728                 case 23:
1729                         term.c.attr.mode &= ~ATTR_ITALIC;
1730                         break;
1731                 case 24:
1732                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1733                         break;
1734                 case 25:
1735                 case 26:
1736                         term.c.attr.mode &= ~ATTR_BLINK;
1737                         break;
1738                 case 27:
1739                         term.c.attr.mode &= ~ATTR_REVERSE;
1740                         break;
1741                 case 38:
1742                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1743                                 term.c.attr.fg = idx;
1744                         break;
1745                 case 39:
1746                         term.c.attr.fg = defaultfg;
1747                         break;
1748                 case 48:
1749                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1750                                 term.c.attr.bg = idx;
1751                         break;
1752                 case 49:
1753                         term.c.attr.bg = defaultbg;
1754                         break;
1755                 default:
1756                         if(BETWEEN(attr[i], 30, 37)) {
1757                                 term.c.attr.fg = attr[i] - 30;
1758                         } else if(BETWEEN(attr[i], 40, 47)) {
1759                                 term.c.attr.bg = attr[i] - 40;
1760                         } else if(BETWEEN(attr[i], 90, 97)) {
1761                                 term.c.attr.fg = attr[i] - 90 + 8;
1762                         } else if(BETWEEN(attr[i], 100, 107)) {
1763                                 term.c.attr.bg = attr[i] - 100 + 8;
1764                         } else {
1765                                 fprintf(stderr,
1766                                         "erresc(default): gfx attr %d unknown\n",
1767                                         attr[i]), csidump();
1768                         }
1769                         break;
1770                 }
1771         }
1772 }
1773
1774 void
1775 tsetscroll(int t, int b) {
1776         int temp;
1777
1778         LIMIT(t, 0, term.row-1);
1779         LIMIT(b, 0, term.row-1);
1780         if(t > b) {
1781                 temp = t;
1782                 t = b;
1783                 b = temp;
1784         }
1785         term.top = t;
1786         term.bot = b;
1787 }
1788
1789 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1790
1791 void
1792 tsetmode(bool priv, bool set, int *args, int narg) {
1793         int *lim, mode;
1794         bool alt;
1795
1796         for(lim = args + narg; args < lim; ++args) {
1797                 if(priv) {
1798                         switch(*args) {
1799                                 break;
1800                         case 1: /* DECCKM -- Cursor key */
1801                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1802                                 break;
1803                         case 5: /* DECSCNM -- Reverse video */
1804                                 mode = term.mode;
1805                                 MODBIT(term.mode, set, MODE_REVERSE);
1806                                 if(mode != term.mode)
1807                                         redraw(REDRAW_TIMEOUT);
1808                                 break;
1809                         case 6: /* DECOM -- Origin */
1810                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1811                                 tmoveato(0, 0);
1812                                 break;
1813                         case 7: /* DECAWM -- Auto wrap */
1814                                 MODBIT(term.mode, set, MODE_WRAP);
1815                                 break;
1816                         case 0:  /* Error (IGNORED) */
1817                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1818                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1819                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1820                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1821                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1822                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1823                         case 42: /* DECNRCM -- National characters (IGNORED) */
1824                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1825                                 break;
1826                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1827                                 MODBIT(term.mode, !set, MODE_HIDE);
1828                                 break;
1829                         case 9:    /* X10 mouse compatibility mode */
1830                                 xsetpointermotion(0);
1831                                 MODBIT(term.mode, 0, MODE_MOUSE);
1832                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1833                                 break;
1834                         case 1000: /* 1000: report button press */
1835                                 xsetpointermotion(0);
1836                                 MODBIT(term.mode, 0, MODE_MOUSE);
1837                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1838                                 break;
1839                         case 1002: /* 1002: report motion on button press */
1840                                 xsetpointermotion(0);
1841                                 MODBIT(term.mode, 0, MODE_MOUSE);
1842                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1843                                 break;
1844                         case 1003: /* 1003: enable all mouse motions */
1845                                 xsetpointermotion(set);
1846                                 MODBIT(term.mode, 0, MODE_MOUSE);
1847                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1848                                 break;
1849                         case 1004: /* 1004: send focus events to tty */
1850                                 MODBIT(term.mode, set, MODE_FOCUS);
1851                                 break;
1852                         case 1006: /* 1006: extended reporting mode */
1853                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1854                                 break;
1855                         case 1034:
1856                                 MODBIT(term.mode, set, MODE_8BIT);
1857                                 break;
1858                         case 1049: /* swap screen & set/restore cursor as xterm */
1859                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1860                         case 47: /* swap screen */
1861                         case 1047:
1862                                 if (!allowaltscreen)
1863                                         break;
1864                                 alt = IS_SET(MODE_ALTSCREEN);
1865                                 if(alt) {
1866                                         tclearregion(0, 0, term.col-1,
1867                                                         term.row-1);
1868                                 }
1869                                 if(set ^ alt) /* set is always 1 or 0 */
1870                                         tswapscreen();
1871                                 if(*args != 1049)
1872                                         break;
1873                                 /* FALLTRU */
1874                         case 1048:
1875                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1876                                 break;
1877                         case 2004: /* 2004: bracketed paste mode */
1878                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1879                                 break;
1880                         /* Not implemented mouse modes. See comments there. */
1881                         case 1001: /* mouse highlight mode; can hang the
1882                                       terminal by design when implemented. */
1883                         case 1005: /* UTF-8 mouse mode; will confuse
1884                                       applications not supporting UTF-8
1885                                       and luit. */
1886                         case 1015: /* urxvt mangled mouse mode; incompatible
1887                                       and can be mistaken for other control
1888                                       codes. */
1889                         default:
1890                                 fprintf(stderr,
1891                                         "erresc: unknown private set/reset mode %d\n",
1892                                         *args);
1893                                 break;
1894                         }
1895                 } else {
1896                         switch(*args) {
1897                         case 0:  /* Error (IGNORED) */
1898                                 break;
1899                         case 2:  /* KAM -- keyboard action */
1900                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1901                                 break;
1902                         case 4:  /* IRM -- Insertion-replacement */
1903                                 MODBIT(term.mode, set, MODE_INSERT);
1904                                 break;
1905                         case 12: /* SRM -- Send/Receive */
1906                                 MODBIT(term.mode, !set, MODE_ECHO);
1907                                 break;
1908                         case 20: /* LNM -- Linefeed/new line */
1909                                 MODBIT(term.mode, set, MODE_CRLF);
1910                                 break;
1911                         default:
1912                                 fprintf(stderr,
1913                                         "erresc: unknown set/reset mode %d\n",
1914                                         *args);
1915                                 break;
1916                         }
1917                 }
1918         }
1919 }
1920
1921 void
1922 csihandle(void) {
1923         switch(csiescseq.mode) {
1924         default:
1925         unknown:
1926                 fprintf(stderr, "erresc: unknown csi ");
1927                 csidump();
1928                 /* die(""); */
1929                 break;
1930         case '@': /* ICH -- Insert <n> blank char */
1931                 DEFAULT(csiescseq.arg[0], 1);
1932                 tinsertblank(csiescseq.arg[0]);
1933                 break;
1934         case 'A': /* CUU -- Cursor <n> Up */
1935                 DEFAULT(csiescseq.arg[0], 1);
1936                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1937                 break;
1938         case 'B': /* CUD -- Cursor <n> Down */
1939         case 'e': /* VPR --Cursor <n> Down */
1940                 DEFAULT(csiescseq.arg[0], 1);
1941                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1942                 break;
1943         case 'c': /* DA -- Device Attributes */
1944                 if(csiescseq.arg[0] == 0)
1945                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1946                 break;
1947         case 'C': /* CUF -- Cursor <n> Forward */
1948         case 'a': /* HPR -- Cursor <n> Forward */
1949                 DEFAULT(csiescseq.arg[0], 1);
1950                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1951                 break;
1952         case 'D': /* CUB -- Cursor <n> Backward */
1953                 DEFAULT(csiescseq.arg[0], 1);
1954                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1955                 break;
1956         case 'E': /* CNL -- Cursor <n> Down and first col */
1957                 DEFAULT(csiescseq.arg[0], 1);
1958                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1959                 break;
1960         case 'F': /* CPL -- Cursor <n> Up and first col */
1961                 DEFAULT(csiescseq.arg[0], 1);
1962                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1963                 break;
1964         case 'g': /* TBC -- Tabulation clear */
1965                 switch(csiescseq.arg[0]) {
1966                 case 0: /* clear current tab stop */
1967                         term.tabs[term.c.x] = 0;
1968                         break;
1969                 case 3: /* clear all the tabs */
1970                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1971                         break;
1972                 default:
1973                         goto unknown;
1974                 }
1975                 break;
1976         case 'G': /* CHA -- Move to <col> */
1977         case '`': /* HPA */
1978                 DEFAULT(csiescseq.arg[0], 1);
1979                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1980                 break;
1981         case 'H': /* CUP -- Move to <row> <col> */
1982         case 'f': /* HVP */
1983                 DEFAULT(csiescseq.arg[0], 1);
1984                 DEFAULT(csiescseq.arg[1], 1);
1985                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1986                 break;
1987         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1988                 DEFAULT(csiescseq.arg[0], 1);
1989                 while(csiescseq.arg[0]--)
1990                         tputtab(1);
1991                 break;
1992         case 'J': /* ED -- Clear screen */
1993                 selclear(NULL);
1994                 switch(csiescseq.arg[0]) {
1995                 case 0: /* below */
1996                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1997                         if(term.c.y < term.row-1) {
1998                                 tclearregion(0, term.c.y+1, term.col-1,
1999                                                 term.row-1);
2000                         }
2001                         break;
2002                 case 1: /* above */
2003                         if(term.c.y > 1)
2004                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2005                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2006                         break;
2007                 case 2: /* all */
2008                         tclearregion(0, 0, term.col-1, term.row-1);
2009                         break;
2010                 default:
2011                         goto unknown;
2012                 }
2013                 break;
2014         case 'K': /* EL -- Clear line */
2015                 switch(csiescseq.arg[0]) {
2016                 case 0: /* right */
2017                         tclearregion(term.c.x, term.c.y, term.col-1,
2018                                         term.c.y);
2019                         break;
2020                 case 1: /* left */
2021                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2022                         break;
2023                 case 2: /* all */
2024                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2025                         break;
2026                 }
2027                 break;
2028         case 'S': /* SU -- Scroll <n> line up */
2029                 DEFAULT(csiescseq.arg[0], 1);
2030                 tscrollup(term.top, csiescseq.arg[0]);
2031                 break;
2032         case 'T': /* SD -- Scroll <n> line down */
2033                 DEFAULT(csiescseq.arg[0], 1);
2034                 tscrolldown(term.top, csiescseq.arg[0]);
2035                 break;
2036         case 'L': /* IL -- Insert <n> blank lines */
2037                 DEFAULT(csiescseq.arg[0], 1);
2038                 tinsertblankline(csiescseq.arg[0]);
2039                 break;
2040         case 'l': /* RM -- Reset Mode */
2041                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2042                 break;
2043         case 'M': /* DL -- Delete <n> lines */
2044                 DEFAULT(csiescseq.arg[0], 1);
2045                 tdeleteline(csiescseq.arg[0]);
2046                 break;
2047         case 'X': /* ECH -- Erase <n> char */
2048                 DEFAULT(csiescseq.arg[0], 1);
2049                 tclearregion(term.c.x, term.c.y,
2050                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2051                 break;
2052         case 'P': /* DCH -- Delete <n> char */
2053                 DEFAULT(csiescseq.arg[0], 1);
2054                 tdeletechar(csiescseq.arg[0]);
2055                 break;
2056         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2057                 DEFAULT(csiescseq.arg[0], 1);
2058                 while(csiescseq.arg[0]--)
2059                         tputtab(0);
2060                 break;
2061         case 'd': /* VPA -- Move to <row> */
2062                 DEFAULT(csiescseq.arg[0], 1);
2063                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2064                 break;
2065         case 'h': /* SM -- Set terminal mode */
2066                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2067                 break;
2068         case 'm': /* SGR -- Terminal attribute (color) */
2069                 tsetattr(csiescseq.arg, csiescseq.narg);
2070                 break;
2071         case 'n': /* DSR – Device Status Report (cursor position) */
2072                 if (csiescseq.arg[0] == 6) {
2073                         char buf[40];
2074                         int len = snprintf(buf, sizeof(buf),"\033[%i;%iR", term.c.y+1, term.c.x+1);
2075                         ttywrite(buf, len);
2076                         break;
2077                 }
2078         case 'r': /* DECSTBM -- Set Scrolling Region */
2079                 if(csiescseq.priv) {
2080                         goto unknown;
2081                 } else {
2082                         DEFAULT(csiescseq.arg[0], 1);
2083                         DEFAULT(csiescseq.arg[1], term.row);
2084                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2085                         tmoveato(0, 0);
2086                 }
2087                 break;
2088         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2089                 tcursor(CURSOR_SAVE);
2090                 break;
2091         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2092                 tcursor(CURSOR_LOAD);
2093                 break;
2094         }
2095 }
2096
2097 void
2098 csidump(void) {
2099         int i;
2100         uint c;
2101
2102         printf("ESC[");
2103         for(i = 0; i < csiescseq.len; i++) {
2104                 c = csiescseq.buf[i] & 0xff;
2105                 if(isprint(c)) {
2106                         putchar(c);
2107                 } else if(c == '\n') {
2108                         printf("(\\n)");
2109                 } else if(c == '\r') {
2110                         printf("(\\r)");
2111                 } else if(c == 0x1b) {
2112                         printf("(\\e)");
2113                 } else {
2114                         printf("(%02x)", c);
2115                 }
2116         }
2117         putchar('\n');
2118 }
2119
2120 void
2121 csireset(void) {
2122         memset(&csiescseq, 0, sizeof(csiescseq));
2123 }
2124
2125 void
2126 strhandle(void) {
2127         char *p = NULL;
2128         int i, j, narg;
2129
2130         strparse();
2131         narg = strescseq.narg;
2132
2133         switch(strescseq.type) {
2134         case ']': /* OSC -- Operating System Command */
2135                 switch(i = atoi(strescseq.args[0])) {
2136                 case 0:
2137                 case 1:
2138                 case 2:
2139                         if(narg > 1)
2140                                 xsettitle(strescseq.args[1]);
2141                         break;
2142                 case 4: /* color set */
2143                         if(narg < 3)
2144                                 break;
2145                         p = strescseq.args[2];
2146                         /* fall through */
2147                 case 104: /* color reset, here p = NULL */
2148                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2149                         if (!xsetcolorname(j, p)) {
2150                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2151                         } else {
2152                                 /*
2153                                  * TODO if defaultbg color is changed, borders
2154                                  * are dirty
2155                                  */
2156                                 redraw(0);
2157                         }
2158                         break;
2159                 default:
2160                         fprintf(stderr, "erresc: unknown str ");
2161                         strdump();
2162                         break;
2163                 }
2164                 break;
2165         case 'k': /* old title set compatibility */
2166                 xsettitle(strescseq.args[0]);
2167                 break;
2168         case 'P': /* DSC -- Device Control String */
2169         case '_': /* APC -- Application Program Command */
2170         case '^': /* PM -- Privacy Message */
2171         default:
2172                 fprintf(stderr, "erresc: unknown str ");
2173                 strdump();
2174                 /* die(""); */
2175                 break;
2176         }
2177 }
2178
2179 void
2180 strparse(void) {
2181         char *p = strescseq.buf;
2182
2183         strescseq.narg = 0;
2184         strescseq.buf[strescseq.len] = '\0';
2185         while(p && strescseq.narg < STR_ARG_SIZ)
2186                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2187 }
2188
2189 void
2190 strdump(void) {
2191         int i;
2192         uint c;
2193
2194         printf("ESC%c", strescseq.type);
2195         for(i = 0; i < strescseq.len; i++) {
2196                 c = strescseq.buf[i] & 0xff;
2197                 if(c == '\0') {
2198                         return;
2199                 } else if(isprint(c)) {
2200                         putchar(c);
2201                 } else if(c == '\n') {
2202                         printf("(\\n)");
2203                 } else if(c == '\r') {
2204                         printf("(\\r)");
2205                 } else if(c == 0x1b) {
2206                         printf("(\\e)");
2207                 } else {
2208                         printf("(%02x)", c);
2209                 }
2210         }
2211         printf("ESC\\\n");
2212 }
2213
2214 void
2215 strreset(void) {
2216         memset(&strescseq, 0, sizeof(strescseq));
2217 }
2218
2219 void
2220 tputtab(bool forward) {
2221         uint x = term.c.x;
2222
2223         if(forward) {
2224                 if(x == term.col)
2225                         return;
2226                 for(++x; x < term.col && !term.tabs[x]; ++x)
2227                         /* nothing */ ;
2228         } else {
2229                 if(x == 0)
2230                         return;
2231                 for(--x; x > 0 && !term.tabs[x]; --x)
2232                         /* nothing */ ;
2233         }
2234         tmoveto(x, term.c.y);
2235 }
2236
2237 void
2238 techo(char *buf, int len) {
2239         for(; len > 0; buf++, len--) {
2240                 char c = *buf;
2241
2242                 if(c == '\033') { /* escape */
2243                         tputc("^", 1);
2244                         tputc("[", 1);
2245                 } else if(c < '\x20') { /* control code */
2246                         if(c != '\n' && c != '\r' && c != '\t') {
2247                                 c |= '\x40';
2248                                 tputc("^", 1);
2249                         }
2250                         tputc(&c, 1);
2251                 } else {
2252                         break;
2253                 }
2254         }
2255         if(len)
2256                 tputc(buf, len);
2257 }
2258
2259 void
2260 tputc(char *c, int len) {
2261         uchar ascii = *c;
2262         bool control = ascii < '\x20' || ascii == 0177;
2263         long u8char;
2264         int width;
2265
2266         if(len == 1) {
2267                 width = 1;
2268         } else {
2269                 utf8decode(c, &u8char);
2270                 width = wcwidth(u8char);
2271         }
2272
2273         if(iofd != -1) {
2274                 if(xwrite(iofd, c, len) < 0) {
2275                         fprintf(stderr, "Error writing in %s:%s\n",
2276                                 opt_io, strerror(errno));
2277                         close(iofd);
2278                         iofd = -1;
2279                 }
2280         }
2281
2282         /*
2283          * STR sequences must be checked before anything else
2284          * because it can use some control codes as part of the sequence.
2285          */
2286         if(term.esc & ESC_STR) {
2287                 switch(ascii) {
2288                 case '\033':
2289                         term.esc = ESC_START | ESC_STR_END;
2290                         break;
2291                 case '\a': /* backwards compatibility to xterm */
2292                         term.esc = 0;
2293                         strhandle();
2294                         break;
2295                 default:
2296                         if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2297                                 memmove(&strescseq.buf[strescseq.len], c, len);
2298                                 strescseq.len += len;
2299                         } else {
2300                         /*
2301                          * Here is a bug in terminals. If the user never sends
2302                          * some code to stop the str or esc command, then st
2303                          * will stop responding. But this is better than
2304                          * silently failing with unknown characters. At least
2305                          * then users will report back.
2306                          *
2307                          * In the case users ever get fixed, here is the code:
2308                          */
2309                         /*
2310                          * term.esc = 0;
2311                          * strhandle();
2312                          */
2313                         }
2314                 }
2315                 return;
2316         }
2317
2318         /*
2319          * Actions of control codes must be performed as soon they arrive
2320          * because they can be embedded inside a control sequence, and
2321          * they must not cause conflicts with sequences.
2322          */
2323         if(control) {
2324                 switch(ascii) {
2325                 case '\t':   /* HT */
2326                         tputtab(1);
2327                         return;
2328                 case '\b':   /* BS */
2329                         tmoveto(term.c.x-1, term.c.y);
2330                         return;
2331                 case '\r':   /* CR */
2332                         tmoveto(0, term.c.y);
2333                         return;
2334                 case '\f':   /* LF */
2335                 case '\v':   /* VT */
2336                 case '\n':   /* LF */
2337                         /* go to first col if the mode is set */
2338                         tnewline(IS_SET(MODE_CRLF));
2339                         return;
2340                 case '\a':   /* BEL */
2341                         if(!(xw.state & WIN_FOCUSED))
2342                                 xseturgency(1);
2343                         if (bellvolume)
2344                                 XBell(xw.dpy, bellvolume);
2345                         return;
2346                 case '\033': /* ESC */
2347                         csireset();
2348                         term.esc = ESC_START;
2349                         return;
2350                 case '\016': /* SO */
2351                 case '\017': /* SI */
2352                         /*
2353                          * Different charsets are hard to handle. Applications
2354                          * should use the right alt charset escapes for the
2355                          * only reason they still exist: line drawing. The
2356                          * rest is incompatible history st should not support.
2357                          */
2358                         return;
2359                 case '\032': /* SUB */
2360                 case '\030': /* CAN */
2361                         csireset();
2362                         return;
2363                 case '\005': /* ENQ (IGNORED) */
2364                 case '\000': /* NUL (IGNORED) */
2365                 case '\021': /* XON (IGNORED) */
2366                 case '\023': /* XOFF (IGNORED) */
2367                 case 0177:   /* DEL (IGNORED) */
2368                         return;
2369                 }
2370         } else if(term.esc & ESC_START) {
2371                 if(term.esc & ESC_CSI) {
2372                         csiescseq.buf[csiescseq.len++] = ascii;
2373                         if(BETWEEN(ascii, 0x40, 0x7E)
2374                                         || csiescseq.len >= \
2375                                         sizeof(csiescseq.buf)-1) {
2376                                 term.esc = 0;
2377                                 csiparse();
2378                                 csihandle();
2379                         }
2380                 } else if(term.esc & ESC_STR_END) {
2381                         term.esc = 0;
2382                         if(ascii == '\\')
2383                                 strhandle();
2384                 } else if(term.esc & ESC_ALTCHARSET) {
2385                         switch(ascii) {
2386                         case '0': /* Line drawing set */
2387                                 term.c.attr.mode |= ATTR_GFX;
2388                                 break;
2389                         case 'B': /* USASCII */
2390                                 term.c.attr.mode &= ~ATTR_GFX;
2391                                 break;
2392                         case 'A': /* UK (IGNORED) */
2393                         case '<': /* multinational charset (IGNORED) */
2394                         case '5': /* Finnish (IGNORED) */
2395                         case 'C': /* Finnish (IGNORED) */
2396                         case 'K': /* German (IGNORED) */
2397                                 break;
2398                         default:
2399                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2400                         }
2401                         term.esc = 0;
2402                 } else if(term.esc & ESC_TEST) {
2403                         if(ascii == '8') { /* DEC screen alignment test. */
2404                                 char E[UTF_SIZ] = "E";
2405                                 int x, y;
2406
2407                                 for(x = 0; x < term.col; ++x) {
2408                                         for(y = 0; y < term.row; ++y)
2409                                                 tsetchar(E, &term.c.attr, x, y);
2410                                 }
2411                         }
2412                         term.esc = 0;
2413                 } else {
2414                         switch(ascii) {
2415                         case '[':
2416                                 term.esc |= ESC_CSI;
2417                                 break;
2418                         case '#':
2419                                 term.esc |= ESC_TEST;
2420                                 break;
2421                         case 'P': /* DCS -- Device Control String */
2422                         case '_': /* APC -- Application Program Command */
2423                         case '^': /* PM -- Privacy Message */
2424                         case ']': /* OSC -- Operating System Command */
2425                         case 'k': /* old title set compatibility */
2426                                 strreset();
2427                                 strescseq.type = ascii;
2428                                 term.esc |= ESC_STR;
2429                                 break;
2430                         case '(': /* set primary charset G0 */
2431                                 term.esc |= ESC_ALTCHARSET;
2432                                 break;
2433                         case ')': /* set secondary charset G1 (IGNORED) */
2434                         case '*': /* set tertiary charset G2 (IGNORED) */
2435                         case '+': /* set quaternary charset G3 (IGNORED) */
2436                                 term.esc = 0;
2437                                 break;
2438                         case 'D': /* IND -- Linefeed */
2439                                 if(term.c.y == term.bot) {
2440                                         tscrollup(term.top, 1);
2441                                 } else {
2442                                         tmoveto(term.c.x, term.c.y+1);
2443                                 }
2444                                 term.esc = 0;
2445                                 break;
2446                         case 'E': /* NEL -- Next line */
2447                                 tnewline(1); /* always go to first col */
2448                                 term.esc = 0;
2449                                 break;
2450                         case 'H': /* HTS -- Horizontal tab stop */
2451                                 term.tabs[term.c.x] = 1;
2452                                 term.esc = 0;
2453                                 break;
2454                         case 'M': /* RI -- Reverse index */
2455                                 if(term.c.y == term.top) {
2456                                         tscrolldown(term.top, 1);
2457                                 } else {
2458                                         tmoveto(term.c.x, term.c.y-1);
2459                                 }
2460                                 term.esc = 0;
2461                                 break;
2462                         case 'Z': /* DECID -- Identify Terminal */
2463                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2464                                 term.esc = 0;
2465                                 break;
2466                         case 'c': /* RIS -- Reset to inital state */
2467                                 treset();
2468                                 term.esc = 0;
2469                                 xresettitle();
2470                                 xloadcols();
2471                                 break;
2472                         case '=': /* DECPAM -- Application keypad */
2473                                 term.mode |= MODE_APPKEYPAD;
2474                                 term.esc = 0;
2475                                 break;
2476                         case '>': /* DECPNM -- Normal keypad */
2477                                 term.mode &= ~MODE_APPKEYPAD;
2478                                 term.esc = 0;
2479                                 break;
2480                         case '7': /* DECSC -- Save Cursor */
2481                                 tcursor(CURSOR_SAVE);
2482                                 term.esc = 0;
2483                                 break;
2484                         case '8': /* DECRC -- Restore Cursor */
2485                                 tcursor(CURSOR_LOAD);
2486                                 term.esc = 0;
2487                                 break;
2488                         case '\\': /* ST -- Stop */
2489                                 term.esc = 0;
2490                                 break;
2491                         default:
2492                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2493                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2494                                 term.esc = 0;
2495                         }
2496                 }
2497                 /*
2498                  * All characters which form part of a sequence are not
2499                  * printed
2500                  */
2501                 return;
2502         }
2503         /*
2504          * Display control codes only if we are in graphic mode
2505          */
2506         if(control && !(term.c.attr.mode & ATTR_GFX))
2507                 return;
2508         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2509                 selclear(NULL);
2510         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2511                 term.line[term.c.y][term.c.x].mode |= ATTR_WRAP;
2512                 tnewline(1);
2513         }
2514
2515         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col) {
2516                 memmove(&term.line[term.c.y][term.c.x+1],
2517                         &term.line[term.c.y][term.c.x],
2518                         (term.col - term.c.x - 1) * sizeof(Glyph));
2519         }
2520
2521         if(term.c.x+width > term.col)
2522                 tnewline(1);
2523
2524         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2525
2526         if(width == 2) {
2527                 term.line[term.c.y][term.c.x].mode |= ATTR_WIDE;
2528                 if(term.c.x+1 < term.col) {
2529                         term.line[term.c.y][term.c.x+1].c[0] = '\0';
2530                         term.line[term.c.y][term.c.x+1].mode = ATTR_WDUMMY;
2531                 }
2532         }
2533         if(term.c.x+width < term.col) {
2534                 tmoveto(term.c.x+width, term.c.y);
2535         } else {
2536                 term.c.state |= CURSOR_WRAPNEXT;
2537         }
2538 }
2539
2540 int
2541 tresize(int col, int row) {
2542         int i;
2543         int minrow = MIN(row, term.row);
2544         int mincol = MIN(col, term.col);
2545         int slide = term.c.y - row + 1;
2546         bool *bp;
2547         Line *orig;
2548
2549         if(col < 1 || row < 1)
2550                 return 0;
2551
2552         /* free unneeded rows */
2553         i = 0;
2554         if(slide > 0) {
2555                 /*
2556                  * slide screen to keep cursor where we expect it -
2557                  * tscrollup would work here, but we can optimize to
2558                  * memmove because we're freeing the earlier lines
2559                  */
2560                 for(/* i = 0 */; i < slide; i++) {
2561                         free(term.line[i]);
2562                         free(term.alt[i]);
2563                 }
2564                 memmove(term.line, term.line + slide, row * sizeof(Line));
2565                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2566         }
2567         for(i += row; i < term.row; i++) {
2568                 free(term.line[i]);
2569                 free(term.alt[i]);
2570         }
2571
2572         /* resize to new height */
2573         term.line = xrealloc(term.line, row * sizeof(Line));
2574         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2575         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2576         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2577
2578         /* resize each row to new width, zero-pad if needed */
2579         for(i = 0; i < minrow; i++) {
2580                 term.dirty[i] = 1;
2581                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2582                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2583         }
2584
2585         /* allocate any new rows */
2586         for(/* i == minrow */; i < row; i++) {
2587                 term.dirty[i] = 1;
2588                 term.line[i] = xmalloc(col * sizeof(Glyph));
2589                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2590         }
2591         if(col > term.col) {
2592                 bp = term.tabs + term.col;
2593
2594                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2595                 while(--bp > term.tabs && !*bp)
2596                         /* nothing */ ;
2597                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2598                         *bp = 1;
2599         }
2600         /* update terminal size */
2601         term.col = col;
2602         term.row = row;
2603         /* reset scrolling region */
2604         tsetscroll(0, row-1);
2605         /* make use of the LIMIT in tmoveto */
2606         tmoveto(term.c.x, term.c.y);
2607         /* Clearing both screens */
2608         orig = term.line;
2609         do {
2610                 if(mincol < col && 0 < minrow) {
2611                         tclearregion(mincol, 0, col - 1, minrow - 1);
2612                 }
2613                 if(0 < col && minrow < row) {
2614                         tclearregion(0, minrow, col - 1, row - 1);
2615                 }
2616                 tswapscreen();
2617         } while(orig != term.line);
2618
2619         return (slide > 0);
2620 }
2621
2622 void
2623 xresize(int col, int row) {
2624         xw.tw = MAX(1, col * xw.cw);
2625         xw.th = MAX(1, row * xw.ch);
2626
2627         XFreePixmap(xw.dpy, xw.buf);
2628         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2629                         DefaultDepth(xw.dpy, xw.scr));
2630         XftDrawChange(xw.draw, xw.buf);
2631         xclear(0, 0, xw.w, xw.h);
2632 }
2633
2634 static inline ushort
2635 sixd_to_16bit(int x) {
2636         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2637 }
2638
2639 void
2640 xloadcols(void) {
2641         int i, r, g, b;
2642         XRenderColor color = { .alpha = 0xffff };
2643         static bool loaded;
2644         Colour *cp;
2645
2646         if(loaded) {
2647                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2648                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2649         }
2650
2651         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2652         for(i = 0; i < LEN(colorname); i++) {
2653                 if(!colorname[i])
2654                         continue;
2655                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2656                         die("Could not allocate color '%s'\n", colorname[i]);
2657                 }
2658         }
2659
2660         /* load colors [16-255] ; same colors as xterm */
2661         for(i = 16, r = 0; r < 6; r++) {
2662                 for(g = 0; g < 6; g++) {
2663                         for(b = 0; b < 6; b++) {
2664                                 color.red = sixd_to_16bit(r);
2665                                 color.green = sixd_to_16bit(g);
2666                                 color.blue = sixd_to_16bit(b);
2667                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i])) {
2668                                         die("Could not allocate color %d\n", i);
2669                                 }
2670                                 i++;
2671                         }
2672                 }
2673         }
2674
2675         for(r = 0; r < 24; r++, i++) {
2676                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
2677                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
2678                                         &dc.col[i])) {
2679                         die("Could not allocate color %d\n", i);
2680                 }
2681         }
2682         loaded = true;
2683 }
2684
2685 int
2686 xsetcolorname(int x, const char *name) {
2687         XRenderColor color = { .alpha = 0xffff };
2688         Colour colour;
2689         if (x < 0 || x > LEN(colorname))
2690                 return -1;
2691         if(!name) {
2692                 if(16 <= x && x < 16 + 216) {
2693                         int r = (x - 16) / 36, g = ((x - 16) % 36) / 6, b = (x - 16) % 6;
2694                         color.red = sixd_to_16bit(r);
2695                         color.green = sixd_to_16bit(g);
2696                         color.blue = sixd_to_16bit(b);
2697                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2698                                 return 0; /* something went wrong */
2699                         dc.col[x] = colour;
2700                         return 1;
2701                 } else if (16 + 216 <= x && x < 256) {
2702                         color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x - (16 + 216));
2703                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2704                                 return 0; /* something went wrong */
2705                         dc.col[x] = colour;
2706                         return 1;
2707                 } else {
2708                         name = colorname[x];
2709                 }
2710         }
2711         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &colour))
2712                 return 0;
2713         dc.col[x] = colour;
2714         return 1;
2715 }
2716
2717 void
2718 xtermclear(int col1, int row1, int col2, int row2) {
2719         XftDrawRect(xw.draw,
2720                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2721                         borderpx + col1 * xw.cw,
2722                         borderpx + row1 * xw.ch,
2723                         (col2-col1+1) * xw.cw,
2724                         (row2-row1+1) * xw.ch);
2725 }
2726
2727 /*
2728  * Absolute coordinates.
2729  */
2730 void
2731 xclear(int x1, int y1, int x2, int y2) {
2732         XftDrawRect(xw.draw,
2733                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2734                         x1, y1, x2-x1, y2-y1);
2735 }
2736
2737 void
2738 xhints(void) {
2739         XClassHint class = {opt_class ? opt_class : termname, termname};
2740         XWMHints wm = {.flags = InputHint, .input = 1};
2741         XSizeHints *sizeh = NULL;
2742
2743         sizeh = XAllocSizeHints();
2744         if(xw.isfixed == False) {
2745                 sizeh->flags = PSize | PResizeInc | PBaseSize;
2746                 sizeh->height = xw.h;
2747                 sizeh->width = xw.w;
2748                 sizeh->height_inc = xw.ch;
2749                 sizeh->width_inc = xw.cw;
2750                 sizeh->base_height = 2 * borderpx;
2751                 sizeh->base_width = 2 * borderpx;
2752         } else {
2753                 sizeh->flags = PMaxSize | PMinSize;
2754                 sizeh->min_width = sizeh->max_width = xw.fw;
2755                 sizeh->min_height = sizeh->max_height = xw.fh;
2756         }
2757
2758         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
2759         XFree(sizeh);
2760 }
2761
2762 int
2763 xloadfont(Font *f, FcPattern *pattern) {
2764         FcPattern *match;
2765         FcResult result;
2766
2767         match = FcFontMatch(NULL, pattern, &result);
2768         if(!match)
2769                 return 1;
2770
2771         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2772                 FcPatternDestroy(match);
2773                 return 1;
2774         }
2775
2776         f->set = NULL;
2777         f->pattern = FcPatternDuplicate(pattern);
2778
2779         f->ascent = f->match->ascent;
2780         f->descent = f->match->descent;
2781         f->lbearing = 0;
2782         f->rbearing = f->match->max_advance_width;
2783
2784         f->height = f->ascent + f->descent;
2785         f->width = f->lbearing + f->rbearing;
2786
2787         return 0;
2788 }
2789
2790 void
2791 xloadfonts(char *fontstr, int fontsize) {
2792         FcPattern *pattern;
2793         FcResult result;
2794         double fontval;
2795
2796         if(fontstr[0] == '-') {
2797                 pattern = XftXlfdParse(fontstr, False, False);
2798         } else {
2799                 pattern = FcNameParse((FcChar8 *)fontstr);
2800         }
2801
2802         if(!pattern)
2803                 die("st: can't open font %s\n", fontstr);
2804
2805         if(fontsize > 0) {
2806                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2807                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2808                 usedfontsize = fontsize;
2809         } else {
2810                 result = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2811                 if(result == FcResultMatch) {
2812                         usedfontsize = (int)fontval;
2813                 } else {
2814                         /*
2815                          * Default font size is 12, if none given. This is to
2816                          * have a known usedfontsize value.
2817                          */
2818                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2819                         usedfontsize = 12;
2820                 }
2821         }
2822
2823         FcConfigSubstitute(0, pattern, FcMatchPattern);
2824         FcDefaultSubstitute(pattern);
2825
2826         if(xloadfont(&dc.font, pattern))
2827                 die("st: can't open font %s\n", fontstr);
2828
2829         /* Setting character width and height. */
2830         xw.cw = CEIL(dc.font.width * cwscale);
2831         xw.ch = CEIL(dc.font.height * chscale);
2832
2833         FcPatternDel(pattern, FC_SLANT);
2834         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2835         if(xloadfont(&dc.ifont, pattern))
2836                 die("st: can't open font %s\n", fontstr);
2837
2838         FcPatternDel(pattern, FC_WEIGHT);
2839         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2840         if(xloadfont(&dc.ibfont, pattern))
2841                 die("st: can't open font %s\n", fontstr);
2842
2843         FcPatternDel(pattern, FC_SLANT);
2844         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2845         if(xloadfont(&dc.bfont, pattern))
2846                 die("st: can't open font %s\n", fontstr);
2847
2848         FcPatternDestroy(pattern);
2849 }
2850
2851 int
2852 xloadfontset(Font *f) {
2853         FcResult result;
2854
2855         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
2856                 return 1;
2857         return 0;
2858 }
2859
2860 void
2861 xunloadfont(Font *f) {
2862         XftFontClose(xw.dpy, f->match);
2863         FcPatternDestroy(f->pattern);
2864         if(f->set)
2865                 FcFontSetDestroy(f->set);
2866 }
2867
2868 void
2869 xunloadfonts(void) {
2870         int i;
2871
2872         /* Free the loaded fonts in the font cache.  */
2873         for(i = 0; i < frclen; i++) {
2874                 XftFontClose(xw.dpy, frc[i].font);
2875         }
2876         frclen = 0;
2877
2878         xunloadfont(&dc.font);
2879         xunloadfont(&dc.bfont);
2880         xunloadfont(&dc.ifont);
2881         xunloadfont(&dc.ibfont);
2882 }
2883
2884 void
2885 xzoom(const Arg *arg) {
2886         xunloadfonts();
2887         xloadfonts(usedfont, usedfontsize + arg->i);
2888         cresize(0, 0);
2889         redraw(0);
2890 }
2891
2892 void
2893 xinit(void) {
2894         XGCValues gcvalues;
2895         Cursor cursor;
2896         Window parent;
2897         int sw, sh;
2898
2899         if(!(xw.dpy = XOpenDisplay(NULL)))
2900                 die("Can't open display\n");
2901         xw.scr = XDefaultScreen(xw.dpy);
2902         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
2903
2904         /* font */
2905         if(!FcInit())
2906                 die("Could not init fontconfig.\n");
2907
2908         usedfont = (opt_font == NULL)? font : opt_font;
2909         xloadfonts(usedfont, 0);
2910
2911         /* colors */
2912         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
2913         xloadcols();
2914
2915         /* adjust fixed window geometry */
2916         if(xw.isfixed) {
2917                 sw = DisplayWidth(xw.dpy, xw.scr);
2918                 sh = DisplayHeight(xw.dpy, xw.scr);
2919                 if(xw.fx < 0)
2920                         xw.fx = sw + xw.fx - xw.fw - 1;
2921                 if(xw.fy < 0)
2922                         xw.fy = sh + xw.fy - xw.fh - 1;
2923
2924                 xw.h = xw.fh;
2925                 xw.w = xw.fw;
2926         } else {
2927                 /* window - default size */
2928                 xw.h = 2 * borderpx + term.row * xw.ch;
2929                 xw.w = 2 * borderpx + term.col * xw.cw;
2930                 xw.fx = 0;
2931                 xw.fy = 0;
2932         }
2933
2934         /* Events */
2935         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
2936         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
2937         xw.attrs.bit_gravity = NorthWestGravity;
2938         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
2939                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
2940                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
2941         xw.attrs.colormap = xw.cmap;
2942
2943         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
2944                         XRootWindow(xw.dpy, xw.scr);
2945         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
2946                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
2947                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
2948                         | CWEventMask | CWColormap, &xw.attrs);
2949
2950         memset(&gcvalues, 0, sizeof(gcvalues));
2951         gcvalues.graphics_exposures = False;
2952         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
2953                         &gcvalues);
2954         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2955                         DefaultDepth(xw.dpy, xw.scr));
2956         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
2957         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
2958
2959         /* Xft rendering context */
2960         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
2961
2962         /* input methods */
2963         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
2964                 XSetLocaleModifiers("@im=local");
2965                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
2966                         XSetLocaleModifiers("@im=");
2967                         if((xw.xim = XOpenIM(xw.dpy,
2968                                         NULL, NULL, NULL)) == NULL) {
2969                                 die("XOpenIM failed. Could not open input"
2970                                         " device.\n");
2971                         }
2972                 }
2973         }
2974         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
2975                                            | XIMStatusNothing, XNClientWindow, xw.win,
2976                                            XNFocusWindow, xw.win, NULL);
2977         if(xw.xic == NULL)
2978                 die("XCreateIC failed. Could not obtain input method.\n");
2979
2980         /* white cursor, black outline */
2981         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
2982         XDefineCursor(xw.dpy, xw.win, cursor);
2983         XRecolorCursor(xw.dpy, cursor,
2984                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
2985                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
2986
2987         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
2988         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
2989         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
2990
2991         xresettitle();
2992         XMapWindow(xw.dpy, xw.win);
2993         xhints();
2994         XSync(xw.dpy, 0);
2995 }
2996
2997 void
2998 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
2999         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3000             width = charlen * xw.cw, xp, i;
3001         int frcflags;
3002         int u8fl, u8fblen, u8cblen, doesexist;
3003         char *u8c, *u8fs;
3004         long u8char;
3005         Font *font = &dc.font;
3006         FcResult fcres;
3007         FcPattern *fcpattern, *fontpattern;
3008         FcFontSet *fcsets[] = { NULL };
3009         FcCharSet *fccharset;
3010         Colour *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3011         XRenderColor colfg, colbg;
3012         Rectangle r;
3013         int oneatatime;
3014
3015         frcflags = FRC_NORMAL;
3016
3017         if(base.mode & ATTR_ITALIC) {
3018                 if(base.fg == defaultfg)
3019                         base.fg = defaultitalic;
3020                 font = &dc.ifont;
3021                 frcflags = FRC_ITALIC;
3022         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3023                 if(base.fg == defaultfg)
3024                         base.fg = defaultitalic;
3025                 font = &dc.ibfont;
3026                 frcflags = FRC_ITALICBOLD;
3027         } else if(base.mode & ATTR_UNDERLINE) {
3028                 if(base.fg == defaultfg)
3029                         base.fg = defaultunderline;
3030         }
3031         if(IS_TRUECOL(base.fg)) {
3032                 colfg.red = TRUERED(base.fg);
3033                 colfg.green = TRUEGREEN(base.fg);
3034                 colfg.blue = TRUEBLUE(base.fg);
3035                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3036                 fg = &truefg;
3037         } else {
3038                 fg = &dc.col[base.fg];
3039         }
3040
3041         if(IS_TRUECOL(base.bg)) {
3042                 colbg.green = TRUEGREEN(base.bg);
3043                 colbg.red = TRUERED(base.bg);
3044                 colbg.blue = TRUEBLUE(base.bg);
3045                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3046                 bg = &truebg;
3047         } else {
3048                 bg = &dc.col[base.bg];
3049         }
3050
3051
3052
3053         if(base.mode & ATTR_BOLD) {
3054                 if(BETWEEN(base.fg, 0, 7)) {
3055                         /* basic system colors */
3056                         fg = &dc.col[base.fg + 8];
3057                 } else if(BETWEEN(base.fg, 16, 195)) {
3058                         /* 256 colors */
3059                         fg = &dc.col[base.fg + 36];
3060                 } else if(BETWEEN(base.fg, 232, 251)) {
3061                         /* greyscale */
3062                         fg = &dc.col[base.fg + 4];
3063                 }
3064                 /*
3065                  * Those ranges will not be brightened:
3066                  *    8 - 15 – bright system colors
3067                  *    196 - 231 – highest 256 color cube
3068                  *    252 - 255 – brightest colors in greyscale
3069                  */
3070                 font = &dc.bfont;
3071                 frcflags = FRC_BOLD;
3072         }
3073
3074         if(IS_SET(MODE_REVERSE)) {
3075                 if(fg == &dc.col[defaultfg]) {
3076                         fg = &dc.col[defaultbg];
3077                 } else {
3078                         colfg.red = ~fg->color.red;
3079                         colfg.green = ~fg->color.green;
3080                         colfg.blue = ~fg->color.blue;
3081                         colfg.alpha = fg->color.alpha;
3082                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3083                         fg = &revfg;
3084                 }
3085
3086                 if(bg == &dc.col[defaultbg]) {
3087                         bg = &dc.col[defaultfg];
3088                 } else {
3089                         colbg.red = ~bg->color.red;
3090                         colbg.green = ~bg->color.green;
3091                         colbg.blue = ~bg->color.blue;
3092                         colbg.alpha = bg->color.alpha;
3093                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &revbg);
3094                         bg = &revbg;
3095                 }
3096         }
3097
3098         if(base.mode & ATTR_REVERSE) {
3099                 temp = fg;
3100                 fg = bg;
3101                 bg = temp;
3102         }
3103
3104         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3105                 fg = bg;
3106
3107         /* Intelligent cleaning up of the borders. */
3108         if(x == 0) {
3109                 xclear(0, (y == 0)? 0 : winy, borderpx,
3110                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3111         }
3112         if(x + charlen >= term.col) {
3113                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3114                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3115         }
3116         if(y == 0)
3117                 xclear(winx, 0, winx + width, borderpx);
3118         if(y == term.row-1)
3119                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3120
3121         /* Clean up the region we want to draw to. */
3122         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3123
3124         /* Set the clip region because Xft is sometimes dirty. */
3125         r.x = 0;
3126         r.y = 0;
3127         r.height = xw.ch;
3128         r.width = width;
3129         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3130
3131         for(xp = winx; bytelen > 0;) {
3132                 /*
3133                  * Search for the range in the to be printed string of glyphs
3134                  * that are in the main font. Then print that range. If
3135                  * some glyph is found that is not in the font, do the
3136                  * fallback dance.
3137                  */
3138                 u8fs = s;
3139                 u8fblen = 0;
3140                 u8fl = 0;
3141                 oneatatime = font->width != xw.cw;
3142                 for(;;) {
3143                         u8c = s;
3144                         u8cblen = utf8decode(s, &u8char);
3145                         s += u8cblen;
3146                         bytelen -= u8cblen;
3147
3148                         doesexist = XftCharExists(xw.dpy, font->match, u8char);
3149                         if(oneatatime || !doesexist || bytelen <= 0) {
3150                                 if(oneatatime || bytelen <= 0) {
3151                                         if(doesexist) {
3152                                                 u8fl++;
3153                                                 u8fblen += u8cblen;
3154                                         }
3155                                 }
3156
3157                                 if(u8fl > 0) {
3158                                         XftDrawStringUtf8(xw.draw, fg,
3159                                                         font->match, xp,
3160                                                         winy + font->ascent,
3161                                                         (FcChar8 *)u8fs,
3162                                                         u8fblen);
3163                                         xp += xw.cw * u8fl;
3164
3165                                 }
3166                                 break;
3167                         }
3168
3169                         u8fl++;
3170                         u8fblen += u8cblen;
3171                 }
3172                 if(doesexist) {
3173                         if (oneatatime)
3174                                 continue;
3175                         break;
3176                 }
3177
3178                 /* Search the font cache. */
3179                 for(i = 0; i < frclen; i++) {
3180                         if(XftCharExists(xw.dpy, frc[i].font, u8char)
3181                                         && frc[i].flags == frcflags) {
3182                                 break;
3183                         }
3184                 }
3185
3186                 /* Nothing was found. */
3187                 if(i >= frclen) {
3188                         if(!font->set)
3189                                 xloadfontset(font);
3190                         fcsets[0] = font->set;
3191
3192                         /*
3193                          * Nothing was found in the cache. Now use
3194                          * some dozen of Fontconfig calls to get the
3195                          * font for one single character.
3196                          */
3197                         fcpattern = FcPatternDuplicate(font->pattern);
3198                         fccharset = FcCharSetCreate();
3199
3200                         FcCharSetAddChar(fccharset, u8char);
3201                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3202                                         fccharset);
3203                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3204                                         FcTrue);
3205
3206                         FcConfigSubstitute(0, fcpattern,
3207                                         FcMatchPattern);
3208                         FcDefaultSubstitute(fcpattern);
3209
3210                         fontpattern = FcFontSetMatch(0, fcsets,
3211                                         FcTrue, fcpattern, &fcres);
3212
3213                         /*
3214                          * Overwrite or create the new cache entry.
3215                          */
3216                         if(frclen >= LEN(frc)) {
3217                                 frclen = LEN(frc) - 1;
3218                                 XftFontClose(xw.dpy, frc[frclen].font);
3219                         }
3220
3221                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3222                                         fontpattern);
3223                         frc[frclen].flags = frcflags;
3224
3225                         i = frclen;
3226                         frclen++;
3227
3228                         FcPatternDestroy(fcpattern);
3229                         FcCharSetDestroy(fccharset);
3230                 }
3231
3232                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3233                                 xp, winy + frc[i].font->ascent,
3234                                 (FcChar8 *)u8c, u8cblen);
3235
3236                 xp += xw.cw * wcwidth(u8char);
3237         }
3238
3239         /*
3240         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3241                         winy + font->ascent, (FcChar8 *)s, bytelen);
3242         */
3243
3244         if(base.mode & ATTR_UNDERLINE) {
3245                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3246                                 width, 1);
3247         }
3248
3249         /* Reset clip to none. */
3250         XftDrawSetClip(xw.draw, 0);
3251 }
3252
3253 void
3254 xdrawcursor(void) {
3255         static int oldx = 0, oldy = 0;
3256         int sl, width, curx;
3257         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3258
3259         LIMIT(oldx, 0, term.col-1);
3260         LIMIT(oldy, 0, term.row-1);
3261
3262         curx = term.c.x;
3263
3264         /* adjust position if in dummy */
3265         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3266                 oldx--;
3267         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3268                 curx--;
3269
3270         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3271
3272         /* remove the old cursor */
3273         sl = utf8size(term.line[oldy][oldx].c);
3274         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3275         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3276                         oldy, width, sl);
3277
3278         /* draw the new one */
3279         if(!(IS_SET(MODE_HIDE))) {
3280                 if(xw.state & WIN_FOCUSED) {
3281                         if(IS_SET(MODE_REVERSE)) {
3282                                 g.mode |= ATTR_REVERSE;
3283                                 g.fg = defaultcs;
3284                                 g.bg = defaultfg;
3285                         }
3286
3287                         sl = utf8size(g.c);
3288                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3289                                 ? 2 : 1;
3290                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3291                 } else {
3292                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3293                                         borderpx + curx * xw.cw,
3294                                         borderpx + term.c.y * xw.ch,
3295                                         xw.cw - 1, 1);
3296                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3297                                         borderpx + curx * xw.cw,
3298                                         borderpx + term.c.y * xw.ch,
3299                                         1, xw.ch - 1);
3300                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3301                                         borderpx + (curx + 1) * xw.cw - 1,
3302                                         borderpx + term.c.y * xw.ch,
3303                                         1, xw.ch - 1);
3304                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3305                                         borderpx + curx * xw.cw,
3306                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3307                                         xw.cw, 1);
3308                 }
3309                 oldx = curx, oldy = term.c.y;
3310         }
3311 }
3312
3313
3314 void
3315 xsettitle(char *p) {
3316         XTextProperty prop;
3317
3318         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3319                         &prop);
3320         XSetWMName(xw.dpy, xw.win, &prop);
3321         XFree(prop.value);
3322 }
3323
3324 void
3325 xresettitle(void) {
3326         xsettitle(opt_title ? opt_title : "st");
3327 }
3328
3329 void
3330 redraw(int timeout) {
3331         struct timespec tv = {0, timeout * 1000};
3332
3333         tfulldirt();
3334         draw();
3335
3336         if(timeout > 0) {
3337                 nanosleep(&tv, NULL);
3338                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3339         }
3340 }
3341
3342 void
3343 draw(void) {
3344         drawregion(0, 0, term.col, term.row);
3345         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3346                         xw.h, 0, 0);
3347         XSetForeground(xw.dpy, dc.gc,
3348                         dc.col[IS_SET(MODE_REVERSE)?
3349                                 defaultfg : defaultbg].pixel);
3350 }
3351
3352 void
3353 drawregion(int x1, int y1, int x2, int y2) {
3354         int ic, ib, x, y, ox, sl;
3355         Glyph base, new;
3356         char buf[DRAW_BUF_SIZ];
3357         bool ena_sel = sel.ob.x != -1;
3358         long u8char;
3359
3360         if(sel.alt ^ IS_SET(MODE_ALTSCREEN))
3361                 ena_sel = 0;
3362
3363         if(!(xw.state & WIN_VISIBLE))
3364                 return;
3365
3366         for(y = y1; y < y2; y++) {
3367                 if(!term.dirty[y])
3368                         continue;
3369
3370                 xtermclear(0, y, term.col, y);
3371                 term.dirty[y] = 0;
3372                 base = term.line[y][0];
3373                 ic = ib = ox = 0;
3374                 for(x = x1; x < x2; x++) {
3375                         new = term.line[y][x];
3376                         if(new.mode == ATTR_WDUMMY)
3377                                 continue;
3378                         if(ena_sel && selected(x, y))
3379                                 new.mode ^= ATTR_REVERSE;
3380                         if(ib > 0 && (ATTRCMP(base, new)
3381                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3382                                 xdraws(buf, base, ox, y, ic, ib);
3383                                 ic = ib = 0;
3384                         }
3385                         if(ib == 0) {
3386                                 ox = x;
3387                                 base = new;
3388                         }
3389
3390                         sl = utf8decode(new.c, &u8char);
3391                         memcpy(buf+ib, new.c, sl);
3392                         ib += sl;
3393                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3394                 }
3395                 if(ib > 0)
3396                         xdraws(buf, base, ox, y, ic, ib);
3397         }
3398         xdrawcursor();
3399 }
3400
3401 void
3402 expose(XEvent *ev) {
3403         XExposeEvent *e = &ev->xexpose;
3404
3405         if(xw.state & WIN_REDRAW) {
3406                 if(!e->count)
3407                         xw.state &= ~WIN_REDRAW;
3408         }
3409         redraw(0);
3410 }
3411
3412 void
3413 visibility(XEvent *ev) {
3414         XVisibilityEvent *e = &ev->xvisibility;
3415
3416         if(e->state == VisibilityFullyObscured) {
3417                 xw.state &= ~WIN_VISIBLE;
3418         } else if(!(xw.state & WIN_VISIBLE)) {
3419                 /* need a full redraw for next Expose, not just a buf copy */
3420                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3421         }
3422 }
3423
3424 void
3425 unmap(XEvent *ev) {
3426         xw.state &= ~WIN_VISIBLE;
3427 }
3428
3429 void
3430 xsetpointermotion(int set) {
3431         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3432         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3433 }
3434
3435 void
3436 xseturgency(int add) {
3437         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3438
3439         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
3440         XSetWMHints(xw.dpy, xw.win, h);
3441         XFree(h);
3442 }
3443
3444 void
3445 focus(XEvent *ev) {
3446         XFocusChangeEvent *e = &ev->xfocus;
3447
3448         if(e->mode == NotifyGrab)
3449                 return;
3450
3451         if(ev->type == FocusIn) {
3452                 XSetICFocus(xw.xic);
3453                 xw.state |= WIN_FOCUSED;
3454                 xseturgency(0);
3455                 if(IS_SET(MODE_FOCUS))
3456                         ttywrite("\033[I", 3);
3457         } else {
3458                 XUnsetICFocus(xw.xic);
3459                 xw.state &= ~WIN_FOCUSED;
3460                 if(IS_SET(MODE_FOCUS))
3461                         ttywrite("\033[O", 3);
3462         }
3463 }
3464
3465 static inline bool
3466 match(uint mask, uint state) {
3467         state &= ~ignoremod;
3468
3469         if(mask == XK_NO_MOD && state)
3470                 return false;
3471         if(mask != XK_ANY_MOD && mask != XK_NO_MOD && !state)
3472                 return false;
3473         if(mask == XK_ANY_MOD)
3474                 return true;
3475         return state == mask;
3476 }
3477
3478 void
3479 numlock(const Arg *dummy) {
3480         term.numlock ^= 1;
3481 }
3482
3483 char*
3484 kmap(KeySym k, uint state) {
3485         Key *kp;
3486         int i;
3487
3488         /* Check for mapped keys out of X11 function keys. */
3489         for(i = 0; i < LEN(mappedkeys); i++) {
3490                 if(mappedkeys[i] == k)
3491                         break;
3492         }
3493         if(i == LEN(mappedkeys)) {
3494                 if((k & 0xFFFF) < 0xFD00)
3495                         return NULL;
3496         }
3497
3498         for(kp = key; kp < key + LEN(key); kp++) {
3499                 if(kp->k != k)
3500                         continue;
3501
3502                 if(!match(kp->mask, state))
3503                         continue;
3504
3505                 if(kp->appkey > 0) {
3506                         if(!IS_SET(MODE_APPKEYPAD))
3507                                 continue;
3508                         if(term.numlock && kp->appkey == 2)
3509                                 continue;
3510                 } else if(kp->appkey < 0 && IS_SET(MODE_APPKEYPAD)) {
3511                         continue;
3512                 }
3513
3514                 if((kp->appcursor < 0 && IS_SET(MODE_APPCURSOR)) ||
3515                                 (kp->appcursor > 0
3516                                  && !IS_SET(MODE_APPCURSOR))) {
3517                         continue;
3518                 }
3519
3520                 if((kp->crlf < 0 && IS_SET(MODE_CRLF)) ||
3521                                 (kp->crlf > 0 && !IS_SET(MODE_CRLF))) {
3522                         continue;
3523                 }
3524
3525                 return kp->s;
3526         }
3527
3528         return NULL;
3529 }
3530
3531 void
3532 kpress(XEvent *ev) {
3533         XKeyEvent *e = &ev->xkey;
3534         KeySym ksym;
3535         char xstr[31], buf[32], *customkey, *cp = buf;
3536         int len, ret;
3537         long c;
3538         Status status;
3539         Shortcut *bp;
3540
3541         if(IS_SET(MODE_KBDLOCK))
3542                 return;
3543
3544         len = XmbLookupString(xw.xic, e, xstr, sizeof(xstr), &ksym, &status);
3545         e->state &= ~Mod2Mask;
3546         /* 1. shortcuts */
3547         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3548                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3549                         bp->func(&(bp->arg));
3550                         return;
3551                 }
3552         }
3553
3554         /* 2. custom keys from config.h */
3555         if((customkey = kmap(ksym, e->state))) {
3556                 len = strlen(customkey);
3557                 memcpy(buf, customkey, len);
3558         /* 3. hardcoded (overrides X lookup) */
3559         } else {
3560                 if(len == 0)
3561                         return;
3562
3563                 if(len == 1 && e->state & Mod1Mask) {
3564                         if(IS_SET(MODE_8BIT)) {
3565                                 if(*xstr < 0177) {
3566                                         c = *xstr | 0x80;
3567                                         ret = utf8encode(&c, cp);
3568                                         cp += ret;
3569                                         len = 0;
3570                                 }
3571                         } else {
3572                                 *cp++ = '\033';
3573                         }
3574                 }
3575
3576                 memcpy(cp, xstr, len);
3577                 len = cp - buf + len;
3578         }
3579
3580         ttywrite(buf, len);
3581         if(IS_SET(MODE_ECHO))
3582                 techo(buf, len);
3583 }
3584
3585
3586 void
3587 cmessage(XEvent *e) {
3588         /*
3589          * See xembed specs
3590          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3591          */
3592         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3593                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3594                         xw.state |= WIN_FOCUSED;
3595                         xseturgency(0);
3596                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3597                         xw.state &= ~WIN_FOCUSED;
3598                 }
3599         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3600                 /* Send SIGHUP to shell */
3601                 kill(pid, SIGHUP);
3602                 exit(EXIT_SUCCESS);
3603         }
3604 }
3605
3606 void
3607 cresize(int width, int height) {
3608         int col, row;
3609
3610         if(width != 0)
3611                 xw.w = width;
3612         if(height != 0)
3613                 xw.h = height;
3614
3615         col = (xw.w - 2 * borderpx) / xw.cw;
3616         row = (xw.h - 2 * borderpx) / xw.ch;
3617
3618         tresize(col, row);
3619         xresize(col, row);
3620         ttyresize();
3621 }
3622
3623 void
3624 resize(XEvent *e) {
3625         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3626                 return;
3627
3628         cresize(e->xconfigure.width, e->xconfigure.height);
3629 }
3630
3631 void
3632 run(void) {
3633         XEvent ev;
3634         int w = xw.w, h = xw.h;
3635         fd_set rfd;
3636         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3637         struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
3638
3639         /* Waiting for window mapping */
3640         while(1) {
3641                 XNextEvent(xw.dpy, &ev);
3642                 if(ev.type == ConfigureNotify) {
3643                         w = ev.xconfigure.width;
3644                         h = ev.xconfigure.height;
3645                 } else if(ev.type == MapNotify) {
3646                         break;
3647                 }
3648         }
3649
3650         if(!xw.isfixed)
3651                 cresize(w, h);
3652         else
3653                 cresize(xw.fw, xw.fh);
3654         ttynew();
3655
3656         gettimeofday(&lastblink, NULL);
3657         gettimeofday(&last, NULL);
3658
3659         for(xev = actionfps;;) {
3660                 FD_ZERO(&rfd);
3661                 FD_SET(cmdfd, &rfd);
3662                 FD_SET(xfd, &rfd);
3663
3664                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3665                         if(errno == EINTR)
3666                                 continue;
3667                         die("select failed: %s\n", SERRNO);
3668                 }
3669                 if(FD_ISSET(cmdfd, &rfd)) {
3670                         ttyread();
3671                         if(blinktimeout) {
3672                                 blinkset = tattrset(ATTR_BLINK);
3673                                 if(!blinkset)
3674                                         MODBIT(term.mode, 0, MODE_BLINK);
3675                         }
3676                 }
3677
3678                 if(FD_ISSET(xfd, &rfd))
3679                         xev = actionfps;
3680
3681                 gettimeofday(&now, NULL);
3682                 drawtimeout.tv_sec = 0;
3683                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3684                 tv = &drawtimeout;
3685
3686                 dodraw = 0;
3687                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3688                         tsetdirtattr(ATTR_BLINK);
3689                         term.mode ^= MODE_BLINK;
3690                         gettimeofday(&lastblink, NULL);
3691                         dodraw = 1;
3692                 }
3693                 if(TIMEDIFF(now, last) \
3694                                 > (xev? (1000/xfps) : (1000/actionfps))) {
3695                         dodraw = 1;
3696                         last = now;
3697                 }
3698
3699                 if(dodraw) {
3700                         while(XPending(xw.dpy)) {
3701                                 XNextEvent(xw.dpy, &ev);
3702                                 if(XFilterEvent(&ev, None))
3703                                         continue;
3704                                 if(handler[ev.type])
3705                                         (handler[ev.type])(&ev);
3706                         }
3707
3708                         draw();
3709                         XFlush(xw.dpy);
3710
3711                         if(xev && !FD_ISSET(xfd, &rfd))
3712                                 xev--;
3713                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3714                                 if(blinkset) {
3715                                         if(TIMEDIFF(now, lastblink) \
3716                                                         > blinktimeout) {
3717                                                 drawtimeout.tv_usec = 1;
3718                                         } else {
3719                                                 drawtimeout.tv_usec = (1000 * \
3720                                                         (blinktimeout - \
3721                                                         TIMEDIFF(now,
3722                                                                 lastblink)));
3723                                         }
3724                                 } else {
3725                                         tv = NULL;
3726                                 }
3727                         }
3728                 }
3729         }
3730 }
3731
3732 void
3733 usage(void) {
3734         die("%s " VERSION " (c) 2010-2013 st engineers\n" \
3735         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3736         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3737 }
3738
3739 int
3740 main(int argc, char *argv[]) {
3741         int bitm, xr, yr;
3742         uint wr, hr;
3743         char *titles;
3744
3745         xw.fw = xw.fh = xw.fx = xw.fy = 0;
3746         xw.isfixed = False;
3747
3748         ARGBEGIN {
3749         case 'a':
3750                 allowaltscreen = false;
3751                 break;
3752         case 'c':
3753                 opt_class = EARGF(usage());
3754                 break;
3755         case 'e':
3756                 /* eat all remaining arguments */
3757                 if(argc > 1) {
3758                         opt_cmd = &argv[1];
3759                         if(argv[1] != NULL && opt_title == NULL) {
3760                                 titles = strdup(argv[1]);
3761                                 opt_title = basename(titles);
3762                         }
3763                 }
3764                 goto run;
3765         case 'f':
3766                 opt_font = EARGF(usage());
3767                 break;
3768         case 'g':
3769                 bitm = XParseGeometry(EARGF(usage()), &xr, &yr, &wr, &hr);
3770                 if(bitm & XValue)
3771                         xw.fx = xr;
3772                 if(bitm & YValue)
3773                         xw.fy = yr;
3774                 if(bitm & WidthValue)
3775                         xw.fw = (int)wr;
3776                 if(bitm & HeightValue)
3777                         xw.fh = (int)hr;
3778                 if(bitm & XNegative && xw.fx == 0)
3779                         xw.fx = -1;
3780                 if(bitm & YNegative && xw.fy == 0)
3781                         xw.fy = -1;
3782
3783                 if(xw.fh != 0 && xw.fw != 0)
3784                         xw.isfixed = True;
3785                 break;
3786         case 'o':
3787                 opt_io = EARGF(usage());
3788                 break;
3789         case 't':
3790                 opt_title = EARGF(usage());
3791                 break;
3792         case 'w':
3793                 opt_embed = EARGF(usage());
3794                 break;
3795         case 'v':
3796         default:
3797                 usage();
3798         } ARGEND;
3799
3800 run:
3801         setlocale(LC_CTYPE, "");
3802         XSetLocaleModifiers("");
3803         tnew(80, 24);
3804         xinit();
3805         selinit();
3806         run();
3807
3808         return 0;
3809 }
3810