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 && !((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;
1346
1347         if(mode == CURSOR_SAVE) {
1348                 c = term.c;
1349         } else if(mode == CURSOR_LOAD) {
1350                 term.c = c;
1351                 tmoveto(c.x, c.y);
1352         }
1353 }
1354
1355 void
1356 treset(void) {
1357         uint i;
1358
1359         term.c = (TCursor){{
1360                 .mode = ATTR_NULL,
1361                 .fg = defaultfg,
1362                 .bg = defaultbg
1363         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1364
1365         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1366         for(i = tabspaces; i < term.col; i += tabspaces)
1367                 term.tabs[i] = 1;
1368         term.top = 0;
1369         term.bot = term.row - 1;
1370         term.mode = MODE_WRAP;
1371
1372         tclearregion(0, 0, term.col-1, term.row-1);
1373         tmoveto(0, 0);
1374         tcursor(CURSOR_SAVE);
1375 }
1376
1377 void
1378 tnew(int col, int row) {
1379         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1380         tresize(col, row);
1381         term.numlock = 1;
1382
1383         treset();
1384 }
1385
1386 void
1387 tswapscreen(void) {
1388         Line *tmp = term.line;
1389
1390         term.line = term.alt;
1391         term.alt = tmp;
1392         term.mode ^= MODE_ALTSCREEN;
1393         tfulldirt();
1394 }
1395
1396 void
1397 tscrolldown(int orig, int n) {
1398         int i;
1399         Line temp;
1400
1401         LIMIT(n, 0, term.bot-orig+1);
1402
1403         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1404
1405         for(i = term.bot; i >= orig+n; i--) {
1406                 temp = term.line[i];
1407                 term.line[i] = term.line[i-n];
1408                 term.line[i-n] = temp;
1409
1410                 term.dirty[i] = 1;
1411                 term.dirty[i-n] = 1;
1412         }
1413
1414         selscroll(orig, n);
1415 }
1416
1417 void
1418 tscrollup(int orig, int n) {
1419         int i;
1420         Line temp;
1421         LIMIT(n, 0, term.bot-orig+1);
1422
1423         tclearregion(0, orig, term.col-1, orig+n-1);
1424
1425         for(i = orig; i <= term.bot-n; i++) {
1426                  temp = term.line[i];
1427                  term.line[i] = term.line[i+n];
1428                  term.line[i+n] = temp;
1429
1430                  term.dirty[i] = 1;
1431                  term.dirty[i+n] = 1;
1432         }
1433
1434         selscroll(orig, -n);
1435 }
1436
1437 void
1438 selscroll(int orig, int n) {
1439         if(sel.ob.x == -1)
1440                 return;
1441
1442         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1443                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1444                         selclear(NULL);
1445                         return;
1446                 }
1447                 if(sel.type == SEL_RECTANGULAR) {
1448                         if(sel.ob.y < term.top)
1449                                 sel.ob.y = term.top;
1450                         if(sel.oe.y > term.bot)
1451                                 sel.oe.y = term.bot;
1452                 } else {
1453                         if(sel.ob.y < term.top) {
1454                                 sel.ob.y = term.top;
1455                                 sel.ob.x = 0;
1456                         }
1457                         if(sel.oe.y > term.bot) {
1458                                 sel.oe.y = term.bot;
1459                                 sel.oe.x = term.col;
1460                         }
1461                 }
1462                 selsort();
1463         }
1464 }
1465
1466 void
1467 tnewline(int first_col) {
1468         int y = term.c.y;
1469
1470         if(y == term.bot) {
1471                 tscrollup(term.top, 1);
1472         } else {
1473                 y++;
1474         }
1475         tmoveto(first_col ? 0 : term.c.x, y);
1476 }
1477
1478 void
1479 csiparse(void) {
1480         char *p = csiescseq.buf, *np;
1481         long int v;
1482
1483         csiescseq.narg = 0;
1484         if(*p == '?') {
1485                 csiescseq.priv = 1;
1486                 p++;
1487         }
1488
1489         csiescseq.buf[csiescseq.len] = '\0';
1490         while(p < csiescseq.buf+csiescseq.len) {
1491                 np = NULL;
1492                 v = strtol(p, &np, 10);
1493                 if(np == p)
1494                         v = 0;
1495                 if(v == LONG_MAX || v == LONG_MIN)
1496                         v = -1;
1497                 csiescseq.arg[csiescseq.narg++] = v;
1498                 p = np;
1499                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1500                         break;
1501                 p++;
1502         }
1503         csiescseq.mode = *p;
1504 }
1505
1506 /* for absolute user moves, when decom is set */
1507 void
1508 tmoveato(int x, int y) {
1509         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1510 }
1511
1512 void
1513 tmoveto(int x, int y) {
1514         int miny, maxy;
1515
1516         if(term.c.state & CURSOR_ORIGIN) {
1517                 miny = term.top;
1518                 maxy = term.bot;
1519         } else {
1520                 miny = 0;
1521                 maxy = term.row - 1;
1522         }
1523         LIMIT(x, 0, term.col-1);
1524         LIMIT(y, miny, maxy);
1525         term.c.state &= ~CURSOR_WRAPNEXT;
1526         term.c.x = x;
1527         term.c.y = y;
1528 }
1529
1530 void
1531 tsetchar(char *c, Glyph *attr, int x, int y) {
1532         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1533                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1534                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1535                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1536                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1537                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1538                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1539                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1540                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1541         };
1542
1543         /*
1544          * The table is proudly stolen from rxvt.
1545          */
1546         if(attr->mode & ATTR_GFX) {
1547                 if(c[0] >= 0x41 && c[0] <= 0x7e
1548                                 && vt100_0[c[0] - 0x41]) {
1549                         c = vt100_0[c[0] - 0x41];
1550                 }
1551         }
1552
1553         if(term.line[y][x].mode & ATTR_WIDE) {
1554                 if(x+1 < term.col) {
1555                         term.line[y][x+1].c[0] = ' ';
1556                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1557                 }
1558         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1559                 term.line[y][x-1].c[0] = ' ';
1560                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1561         }
1562
1563         term.dirty[y] = 1;
1564         term.line[y][x] = *attr;
1565         memcpy(term.line[y][x].c, c, UTF_SIZ);
1566 }
1567
1568 void
1569 tclearregion(int x1, int y1, int x2, int y2) {
1570         int x, y, temp;
1571
1572         if(x1 > x2)
1573                 temp = x1, x1 = x2, x2 = temp;
1574         if(y1 > y2)
1575                 temp = y1, y1 = y2, y2 = temp;
1576
1577         LIMIT(x1, 0, term.col-1);
1578         LIMIT(x2, 0, term.col-1);
1579         LIMIT(y1, 0, term.row-1);
1580         LIMIT(y2, 0, term.row-1);
1581
1582         for(y = y1; y <= y2; y++) {
1583                 term.dirty[y] = 1;
1584                 for(x = x1; x <= x2; x++) {
1585                         if(selected(x, y))
1586                                 selclear(NULL);
1587                         term.line[y][x] = term.c.attr;
1588                         memcpy(term.line[y][x].c, " ", 2);
1589                 }
1590         }
1591 }
1592
1593 void
1594 tdeletechar(int n) {
1595         int src = term.c.x + n;
1596         int dst = term.c.x;
1597         int size = term.col - src;
1598
1599         term.dirty[term.c.y] = 1;
1600
1601         if(src >= term.col) {
1602                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1603                 return;
1604         }
1605
1606         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1607                         size * sizeof(Glyph));
1608         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1609 }
1610
1611 void
1612 tinsertblank(int n) {
1613         int src = term.c.x;
1614         int dst = src + n;
1615         int size = term.col - dst;
1616
1617         term.dirty[term.c.y] = 1;
1618
1619         if(dst >= term.col) {
1620                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1621                 return;
1622         }
1623
1624         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1625                         size * sizeof(Glyph));
1626         tclearregion(src, term.c.y, dst - 1, term.c.y);
1627 }
1628
1629 void
1630 tinsertblankline(int n) {
1631         if(term.c.y < term.top || term.c.y > term.bot)
1632                 return;
1633
1634         tscrolldown(term.c.y, n);
1635 }
1636
1637 void
1638 tdeleteline(int n) {
1639         if(term.c.y < term.top || term.c.y > term.bot)
1640                 return;
1641
1642         tscrollup(term.c.y, n);
1643 }
1644
1645 long
1646 tdefcolor(int *attr, int *npar, int l) {
1647         long idx = -1;
1648         uint r, g, b;
1649
1650         switch (attr[*npar + 1]) {
1651         case 2: /* direct colour in RGB space */
1652                 if (*npar + 4 >= l) {
1653                         fprintf(stderr,
1654                                 "erresc(38): Incorrect number of parameters (%d)\n",
1655                                 *npar);
1656                         break;
1657                 }
1658                 r = attr[*npar + 2];
1659                 g = attr[*npar + 3];
1660                 b = attr[*npar + 4];
1661                 *npar += 4;
1662                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1663                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1664                                 r, g, b);
1665                 else
1666                         idx = TRUECOLOR(r, g, b);
1667                 break;
1668         case 5: /* indexed colour */
1669                 if (*npar + 2 >= l) {
1670                         fprintf(stderr,
1671                                 "erresc(38): Incorrect number of parameters (%d)\n",
1672                                 *npar);
1673                         break;
1674                 }
1675                 *npar += 2;
1676                 if(!BETWEEN(attr[*npar], 0, 255))
1677                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1678                 else
1679                         idx = attr[*npar];
1680                 break;
1681         case 0: /* implemented defined (only foreground) */
1682         case 1: /* transparent */
1683         case 3: /* direct colour in CMY space */
1684         case 4: /* direct colour in CMYK space */
1685         default:
1686                 fprintf(stderr,
1687                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1688         }
1689
1690         return idx;
1691 }
1692
1693 void
1694 tsetattr(int *attr, int l) {
1695         int i;
1696         long idx;
1697
1698         for(i = 0; i < l; i++) {
1699                 switch(attr[i]) {
1700                 case 0:
1701                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE \
1702                                         | ATTR_BOLD | ATTR_ITALIC \
1703                                         | ATTR_BLINK);
1704                         term.c.attr.fg = defaultfg;
1705                         term.c.attr.bg = defaultbg;
1706                         break;
1707                 case 1:
1708                         term.c.attr.mode |= ATTR_BOLD;
1709                         break;
1710                 case 3:
1711                         term.c.attr.mode |= ATTR_ITALIC;
1712                         break;
1713                 case 4:
1714                         term.c.attr.mode |= ATTR_UNDERLINE;
1715                         break;
1716                 case 5: /* slow blink */
1717                 case 6: /* rapid blink */
1718                         term.c.attr.mode |= ATTR_BLINK;
1719                         break;
1720                 case 7:
1721                         term.c.attr.mode |= ATTR_REVERSE;
1722                         break;
1723                 case 21:
1724                 case 22:
1725                         term.c.attr.mode &= ~ATTR_BOLD;
1726                         break;
1727                 case 23:
1728                         term.c.attr.mode &= ~ATTR_ITALIC;
1729                         break;
1730                 case 24:
1731                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1732                         break;
1733                 case 25:
1734                 case 26:
1735                         term.c.attr.mode &= ~ATTR_BLINK;
1736                         break;
1737                 case 27:
1738                         term.c.attr.mode &= ~ATTR_REVERSE;
1739                         break;
1740                 case 38:
1741                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1742                                 term.c.attr.fg = idx;
1743                         break;
1744                 case 39:
1745                         term.c.attr.fg = defaultfg;
1746                         break;
1747                 case 48:
1748                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1749                                 term.c.attr.bg = idx;
1750                         break;
1751                 case 49:
1752                         term.c.attr.bg = defaultbg;
1753                         break;
1754                 default:
1755                         if(BETWEEN(attr[i], 30, 37)) {
1756                                 term.c.attr.fg = attr[i] - 30;
1757                         } else if(BETWEEN(attr[i], 40, 47)) {
1758                                 term.c.attr.bg = attr[i] - 40;
1759                         } else if(BETWEEN(attr[i], 90, 97)) {
1760                                 term.c.attr.fg = attr[i] - 90 + 8;
1761                         } else if(BETWEEN(attr[i], 100, 107)) {
1762                                 term.c.attr.bg = attr[i] - 100 + 8;
1763                         } else {
1764                                 fprintf(stderr,
1765                                         "erresc(default): gfx attr %d unknown\n",
1766                                         attr[i]), csidump();
1767                         }
1768                         break;
1769                 }
1770         }
1771 }
1772
1773 void
1774 tsetscroll(int t, int b) {
1775         int temp;
1776
1777         LIMIT(t, 0, term.row-1);
1778         LIMIT(b, 0, term.row-1);
1779         if(t > b) {
1780                 temp = t;
1781                 t = b;
1782                 b = temp;
1783         }
1784         term.top = t;
1785         term.bot = b;
1786 }
1787
1788 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1789
1790 void
1791 tsetmode(bool priv, bool set, int *args, int narg) {
1792         int *lim, mode;
1793         bool alt;
1794
1795         for(lim = args + narg; args < lim; ++args) {
1796                 if(priv) {
1797                         switch(*args) {
1798                                 break;
1799                         case 1: /* DECCKM -- Cursor key */
1800                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1801                                 break;
1802                         case 5: /* DECSCNM -- Reverse video */
1803                                 mode = term.mode;
1804                                 MODBIT(term.mode, set, MODE_REVERSE);
1805                                 if(mode != term.mode)
1806                                         redraw(REDRAW_TIMEOUT);
1807                                 break;
1808                         case 6: /* DECOM -- Origin */
1809                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1810                                 tmoveato(0, 0);
1811                                 break;
1812                         case 7: /* DECAWM -- Auto wrap */
1813                                 MODBIT(term.mode, set, MODE_WRAP);
1814                                 break;
1815                         case 0:  /* Error (IGNORED) */
1816                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1817                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1818                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1819                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1820                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1821                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1822                         case 42: /* DECNRCM -- National characters (IGNORED) */
1823                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1824                                 break;
1825                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1826                                 MODBIT(term.mode, !set, MODE_HIDE);
1827                                 break;
1828                         case 9:    /* X10 mouse compatibility mode */
1829                                 xsetpointermotion(0);
1830                                 MODBIT(term.mode, 0, MODE_MOUSE);
1831                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1832                                 break;
1833                         case 1000: /* 1000: report button press */
1834                                 xsetpointermotion(0);
1835                                 MODBIT(term.mode, 0, MODE_MOUSE);
1836                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1837                                 break;
1838                         case 1002: /* 1002: report motion on button press */
1839                                 xsetpointermotion(0);
1840                                 MODBIT(term.mode, 0, MODE_MOUSE);
1841                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1842                                 break;
1843                         case 1003: /* 1003: enable all mouse motions */
1844                                 xsetpointermotion(set);
1845                                 MODBIT(term.mode, 0, MODE_MOUSE);
1846                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1847                                 break;
1848                         case 1004: /* 1004: send focus events to tty */
1849                                 MODBIT(term.mode, set, MODE_FOCUS);
1850                                 break;
1851                         case 1006: /* 1006: extended reporting mode */
1852                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1853                                 break;
1854                         case 1034:
1855                                 MODBIT(term.mode, set, MODE_8BIT);
1856                                 break;
1857                         case 1049: /* = 1047 and 1048 */
1858                         case 47:
1859                         case 1047:
1860                                 if (!allowaltscreen)
1861                                         break;
1862
1863                                 alt = IS_SET(MODE_ALTSCREEN);
1864                                 if(alt) {
1865                                         tclearregion(0, 0, term.col-1,
1866                                                         term.row-1);
1867                                 }
1868                                 if(set ^ alt) /* set is always 1 or 0 */
1869                                         tswapscreen();
1870                                 if(*args != 1049)
1871                                         break;
1872                                 /* FALLTRU */
1873                         case 1048:
1874                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1875                                 break;
1876                         case 2004: /* 2004: bracketed paste mode */
1877                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1878                                 break;
1879                         /* Not implemented mouse modes. See comments there. */
1880                         case 1001: /* mouse highlight mode; can hang the
1881                                       terminal by design when implemented. */
1882                         case 1005: /* UTF-8 mouse mode; will confuse
1883                                       applications not supporting UTF-8
1884                                       and luit. */
1885                         case 1015: /* urxvt mangled mouse mode; incompatible
1886                                       and can be mistaken for other control
1887                                       codes. */
1888                         default:
1889                                 fprintf(stderr,
1890                                         "erresc: unknown private set/reset mode %d\n",
1891                                         *args);
1892                                 break;
1893                         }
1894                 } else {
1895                         switch(*args) {
1896                         case 0:  /* Error (IGNORED) */
1897                                 break;
1898                         case 2:  /* KAM -- keyboard action */
1899                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1900                                 break;
1901                         case 4:  /* IRM -- Insertion-replacement */
1902                                 MODBIT(term.mode, set, MODE_INSERT);
1903                                 break;
1904                         case 12: /* SRM -- Send/Receive */
1905                                 MODBIT(term.mode, !set, MODE_ECHO);
1906                                 break;
1907                         case 20: /* LNM -- Linefeed/new line */
1908                                 MODBIT(term.mode, set, MODE_CRLF);
1909                                 break;
1910                         default:
1911                                 fprintf(stderr,
1912                                         "erresc: unknown set/reset mode %d\n",
1913                                         *args);
1914                                 break;
1915                         }
1916                 }
1917         }
1918 }
1919
1920 void
1921 csihandle(void) {
1922         switch(csiescseq.mode) {
1923         default:
1924         unknown:
1925                 fprintf(stderr, "erresc: unknown csi ");
1926                 csidump();
1927                 /* die(""); */
1928                 break;
1929         case '@': /* ICH -- Insert <n> blank char */
1930                 DEFAULT(csiescseq.arg[0], 1);
1931                 tinsertblank(csiescseq.arg[0]);
1932                 break;
1933         case 'A': /* CUU -- Cursor <n> Up */
1934                 DEFAULT(csiescseq.arg[0], 1);
1935                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1936                 break;
1937         case 'B': /* CUD -- Cursor <n> Down */
1938         case 'e': /* VPR --Cursor <n> Down */
1939                 DEFAULT(csiescseq.arg[0], 1);
1940                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1941                 break;
1942         case 'c': /* DA -- Device Attributes */
1943                 if(csiescseq.arg[0] == 0)
1944                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1945                 break;
1946         case 'C': /* CUF -- Cursor <n> Forward */
1947         case 'a': /* HPR -- Cursor <n> Forward */
1948                 DEFAULT(csiescseq.arg[0], 1);
1949                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1950                 break;
1951         case 'D': /* CUB -- Cursor <n> Backward */
1952                 DEFAULT(csiescseq.arg[0], 1);
1953                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1954                 break;
1955         case 'E': /* CNL -- Cursor <n> Down and first col */
1956                 DEFAULT(csiescseq.arg[0], 1);
1957                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1958                 break;
1959         case 'F': /* CPL -- Cursor <n> Up and first col */
1960                 DEFAULT(csiescseq.arg[0], 1);
1961                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1962                 break;
1963         case 'g': /* TBC -- Tabulation clear */
1964                 switch(csiescseq.arg[0]) {
1965                 case 0: /* clear current tab stop */
1966                         term.tabs[term.c.x] = 0;
1967                         break;
1968                 case 3: /* clear all the tabs */
1969                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1970                         break;
1971                 default:
1972                         goto unknown;
1973                 }
1974                 break;
1975         case 'G': /* CHA -- Move to <col> */
1976         case '`': /* HPA */
1977                 DEFAULT(csiescseq.arg[0], 1);
1978                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1979                 break;
1980         case 'H': /* CUP -- Move to <row> <col> */
1981         case 'f': /* HVP */
1982                 DEFAULT(csiescseq.arg[0], 1);
1983                 DEFAULT(csiescseq.arg[1], 1);
1984                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1985                 break;
1986         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1987                 DEFAULT(csiescseq.arg[0], 1);
1988                 while(csiescseq.arg[0]--)
1989                         tputtab(1);
1990                 break;
1991         case 'J': /* ED -- Clear screen */
1992                 selclear(NULL);
1993                 switch(csiescseq.arg[0]) {
1994                 case 0: /* below */
1995                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1996                         if(term.c.y < term.row-1) {
1997                                 tclearregion(0, term.c.y+1, term.col-1,
1998                                                 term.row-1);
1999                         }
2000                         break;
2001                 case 1: /* above */
2002                         if(term.c.y > 1)
2003                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2004                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2005                         break;
2006                 case 2: /* all */
2007                         tclearregion(0, 0, term.col-1, term.row-1);
2008                         break;
2009                 default:
2010                         goto unknown;
2011                 }
2012                 break;
2013         case 'K': /* EL -- Clear line */
2014                 switch(csiescseq.arg[0]) {
2015                 case 0: /* right */
2016                         tclearregion(term.c.x, term.c.y, term.col-1,
2017                                         term.c.y);
2018                         break;
2019                 case 1: /* left */
2020                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2021                         break;
2022                 case 2: /* all */
2023                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2024                         break;
2025                 }
2026                 break;
2027         case 'S': /* SU -- Scroll <n> line up */
2028                 DEFAULT(csiescseq.arg[0], 1);
2029                 tscrollup(term.top, csiescseq.arg[0]);
2030                 break;
2031         case 'T': /* SD -- Scroll <n> line down */
2032                 DEFAULT(csiescseq.arg[0], 1);
2033                 tscrolldown(term.top, csiescseq.arg[0]);
2034                 break;
2035         case 'L': /* IL -- Insert <n> blank lines */
2036                 DEFAULT(csiescseq.arg[0], 1);
2037                 tinsertblankline(csiescseq.arg[0]);
2038                 break;
2039         case 'l': /* RM -- Reset Mode */
2040                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2041                 break;
2042         case 'M': /* DL -- Delete <n> lines */
2043                 DEFAULT(csiescseq.arg[0], 1);
2044                 tdeleteline(csiescseq.arg[0]);
2045                 break;
2046         case 'X': /* ECH -- Erase <n> char */
2047                 DEFAULT(csiescseq.arg[0], 1);
2048                 tclearregion(term.c.x, term.c.y,
2049                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2050                 break;
2051         case 'P': /* DCH -- Delete <n> char */
2052                 DEFAULT(csiescseq.arg[0], 1);
2053                 tdeletechar(csiescseq.arg[0]);
2054                 break;
2055         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2056                 DEFAULT(csiescseq.arg[0], 1);
2057                 while(csiescseq.arg[0]--)
2058                         tputtab(0);
2059                 break;
2060         case 'd': /* VPA -- Move to <row> */
2061                 DEFAULT(csiescseq.arg[0], 1);
2062                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2063                 break;
2064         case 'h': /* SM -- Set terminal mode */
2065                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2066                 break;
2067         case 'm': /* SGR -- Terminal attribute (color) */
2068                 tsetattr(csiescseq.arg, csiescseq.narg);
2069                 break;
2070         case 'r': /* DECSTBM -- Set Scrolling Region */
2071                 if(csiescseq.priv) {
2072                         goto unknown;
2073                 } else {
2074                         DEFAULT(csiescseq.arg[0], 1);
2075                         DEFAULT(csiescseq.arg[1], term.row);
2076                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2077                         tmoveato(0, 0);
2078                 }
2079                 break;
2080         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2081                 tcursor(CURSOR_SAVE);
2082                 break;
2083         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2084                 tcursor(CURSOR_LOAD);
2085                 break;
2086         }
2087 }
2088
2089 void
2090 csidump(void) {
2091         int i;
2092         uint c;
2093
2094         printf("ESC[");
2095         for(i = 0; i < csiescseq.len; i++) {
2096                 c = csiescseq.buf[i] & 0xff;
2097                 if(isprint(c)) {
2098                         putchar(c);
2099                 } else if(c == '\n') {
2100                         printf("(\\n)");
2101                 } else if(c == '\r') {
2102                         printf("(\\r)");
2103                 } else if(c == 0x1b) {
2104                         printf("(\\e)");
2105                 } else {
2106                         printf("(%02x)", c);
2107                 }
2108         }
2109         putchar('\n');
2110 }
2111
2112 void
2113 csireset(void) {
2114         memset(&csiescseq, 0, sizeof(csiescseq));
2115 }
2116
2117 void
2118 strhandle(void) {
2119         char *p = NULL;
2120         int i, j, narg;
2121
2122         strparse();
2123         narg = strescseq.narg;
2124
2125         switch(strescseq.type) {
2126         case ']': /* OSC -- Operating System Command */
2127                 switch(i = atoi(strescseq.args[0])) {
2128                 case 0:
2129                 case 1:
2130                 case 2:
2131                         if(narg > 1)
2132                                 xsettitle(strescseq.args[1]);
2133                         break;
2134                 case 4: /* color set */
2135                         if(narg < 3)
2136                                 break;
2137                         p = strescseq.args[2];
2138                         /* fall through */
2139                 case 104: /* color reset, here p = NULL */
2140                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2141                         if (!xsetcolorname(j, p)) {
2142                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2143                         } else {
2144                                 /*
2145                                  * TODO if defaultbg color is changed, borders
2146                                  * are dirty
2147                                  */
2148                                 redraw(0);
2149                         }
2150                         break;
2151                 default:
2152                         fprintf(stderr, "erresc: unknown str ");
2153                         strdump();
2154                         break;
2155                 }
2156                 break;
2157         case 'k': /* old title set compatibility */
2158                 xsettitle(strescseq.args[0]);
2159                 break;
2160         case 'P': /* DSC -- Device Control String */
2161         case '_': /* APC -- Application Program Command */
2162         case '^': /* PM -- Privacy Message */
2163         default:
2164                 fprintf(stderr, "erresc: unknown str ");
2165                 strdump();
2166                 /* die(""); */
2167                 break;
2168         }
2169 }
2170
2171 void
2172 strparse(void) {
2173         char *p = strescseq.buf;
2174
2175         strescseq.narg = 0;
2176         strescseq.buf[strescseq.len] = '\0';
2177         while(p && strescseq.narg < STR_ARG_SIZ)
2178                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2179 }
2180
2181 void
2182 strdump(void) {
2183         int i;
2184         uint c;
2185
2186         printf("ESC%c", strescseq.type);
2187         for(i = 0; i < strescseq.len; i++) {
2188                 c = strescseq.buf[i] & 0xff;
2189                 if(c == '\0') {
2190                         return;
2191                 } else if(isprint(c)) {
2192                         putchar(c);
2193                 } else if(c == '\n') {
2194                         printf("(\\n)");
2195                 } else if(c == '\r') {
2196                         printf("(\\r)");
2197                 } else if(c == 0x1b) {
2198                         printf("(\\e)");
2199                 } else {
2200                         printf("(%02x)", c);
2201                 }
2202         }
2203         printf("ESC\\\n");
2204 }
2205
2206 void
2207 strreset(void) {
2208         memset(&strescseq, 0, sizeof(strescseq));
2209 }
2210
2211 void
2212 tputtab(bool forward) {
2213         uint x = term.c.x;
2214
2215         if(forward) {
2216                 if(x == term.col)
2217                         return;
2218                 for(++x; x < term.col && !term.tabs[x]; ++x)
2219                         /* nothing */ ;
2220         } else {
2221                 if(x == 0)
2222                         return;
2223                 for(--x; x > 0 && !term.tabs[x]; --x)
2224                         /* nothing */ ;
2225         }
2226         tmoveto(x, term.c.y);
2227 }
2228
2229 void
2230 techo(char *buf, int len) {
2231         for(; len > 0; buf++, len--) {
2232                 char c = *buf;
2233
2234                 if(c == '\033') { /* escape */
2235                         tputc("^", 1);
2236                         tputc("[", 1);
2237                 } else if(c < '\x20') { /* control code */
2238                         if(c != '\n' && c != '\r' && c != '\t') {
2239                                 c |= '\x40';
2240                                 tputc("^", 1);
2241                         }
2242                         tputc(&c, 1);
2243                 } else {
2244                         break;
2245                 }
2246         }
2247         if(len)
2248                 tputc(buf, len);
2249 }
2250
2251 void
2252 tputc(char *c, int len) {
2253         uchar ascii = *c;
2254         bool control = ascii < '\x20' || ascii == 0177;
2255         long u8char;
2256         int width;
2257
2258         if(len == 1) {
2259                 width = 1;
2260         } else {
2261                 utf8decode(c, &u8char);
2262                 width = wcwidth(u8char);
2263         }
2264
2265         if(iofd != -1) {
2266                 if(xwrite(iofd, c, len) < 0) {
2267                         fprintf(stderr, "Error writing in %s:%s\n",
2268                                 opt_io, strerror(errno));
2269                         close(iofd);
2270                         iofd = -1;
2271                 }
2272         }
2273
2274         /*
2275          * STR sequences must be checked before anything else
2276          * because it can use some control codes as part of the sequence.
2277          */
2278         if(term.esc & ESC_STR) {
2279                 switch(ascii) {
2280                 case '\033':
2281                         term.esc = ESC_START | ESC_STR_END;
2282                         break;
2283                 case '\a': /* backwards compatibility to xterm */
2284                         term.esc = 0;
2285                         strhandle();
2286                         break;
2287                 default:
2288                         if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2289                                 memmove(&strescseq.buf[strescseq.len], c, len);
2290                                 strescseq.len += len;
2291                         } else {
2292                         /*
2293                          * Here is a bug in terminals. If the user never sends
2294                          * some code to stop the str or esc command, then st
2295                          * will stop responding. But this is better than
2296                          * silently failing with unknown characters. At least
2297                          * then users will report back.
2298                          *
2299                          * In the case users ever get fixed, here is the code:
2300                          */
2301                         /*
2302                          * term.esc = 0;
2303                          * strhandle();
2304                          */
2305                         }
2306                 }
2307                 return;
2308         }
2309
2310         /*
2311          * Actions of control codes must be performed as soon they arrive
2312          * because they can be embedded inside a control sequence, and
2313          * they must not cause conflicts with sequences.
2314          */
2315         if(control) {
2316                 switch(ascii) {
2317                 case '\t':   /* HT */
2318                         tputtab(1);
2319                         return;
2320                 case '\b':   /* BS */
2321                         tmoveto(term.c.x-1, term.c.y);
2322                         return;
2323                 case '\r':   /* CR */
2324                         tmoveto(0, term.c.y);
2325                         return;
2326                 case '\f':   /* LF */
2327                 case '\v':   /* VT */
2328                 case '\n':   /* LF */
2329                         /* go to first col if the mode is set */
2330                         tnewline(IS_SET(MODE_CRLF));
2331                         return;
2332                 case '\a':   /* BEL */
2333                         if(!(xw.state & WIN_FOCUSED))
2334                                 xseturgency(1);
2335                         if (bellvolume)
2336                                 XBell(xw.dpy, bellvolume);
2337                         return;
2338                 case '\033': /* ESC */
2339                         csireset();
2340                         term.esc = ESC_START;
2341                         return;
2342                 case '\016': /* SO */
2343                 case '\017': /* SI */
2344                         /*
2345                          * Different charsets are hard to handle. Applications
2346                          * should use the right alt charset escapes for the
2347                          * only reason they still exist: line drawing. The
2348                          * rest is incompatible history st should not support.
2349                          */
2350                         return;
2351                 case '\032': /* SUB */
2352                 case '\030': /* CAN */
2353                         csireset();
2354                         return;
2355                 case '\005': /* ENQ (IGNORED) */
2356                 case '\000': /* NUL (IGNORED) */
2357                 case '\021': /* XON (IGNORED) */
2358                 case '\023': /* XOFF (IGNORED) */
2359                 case 0177:   /* DEL (IGNORED) */
2360                         return;
2361                 }
2362         } else if(term.esc & ESC_START) {
2363                 if(term.esc & ESC_CSI) {
2364                         csiescseq.buf[csiescseq.len++] = ascii;
2365                         if(BETWEEN(ascii, 0x40, 0x7E)
2366                                         || csiescseq.len >= \
2367                                         sizeof(csiescseq.buf)-1) {
2368                                 term.esc = 0;
2369                                 csiparse();
2370                                 csihandle();
2371                         }
2372                 } else if(term.esc & ESC_STR_END) {
2373                         term.esc = 0;
2374                         if(ascii == '\\')
2375                                 strhandle();
2376                 } else if(term.esc & ESC_ALTCHARSET) {
2377                         switch(ascii) {
2378                         case '0': /* Line drawing set */
2379                                 term.c.attr.mode |= ATTR_GFX;
2380                                 break;
2381                         case 'B': /* USASCII */
2382                                 term.c.attr.mode &= ~ATTR_GFX;
2383                                 break;
2384                         case 'A': /* UK (IGNORED) */
2385                         case '<': /* multinational charset (IGNORED) */
2386                         case '5': /* Finnish (IGNORED) */
2387                         case 'C': /* Finnish (IGNORED) */
2388                         case 'K': /* German (IGNORED) */
2389                                 break;
2390                         default:
2391                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2392                         }
2393                         term.esc = 0;
2394                 } else if(term.esc & ESC_TEST) {
2395                         if(ascii == '8') { /* DEC screen alignment test. */
2396                                 char E[UTF_SIZ] = "E";
2397                                 int x, y;
2398
2399                                 for(x = 0; x < term.col; ++x) {
2400                                         for(y = 0; y < term.row; ++y)
2401                                                 tsetchar(E, &term.c.attr, x, y);
2402                                 }
2403                         }
2404                         term.esc = 0;
2405                 } else {
2406                         switch(ascii) {
2407                         case '[':
2408                                 term.esc |= ESC_CSI;
2409                                 break;
2410                         case '#':
2411                                 term.esc |= ESC_TEST;
2412                                 break;
2413                         case 'P': /* DCS -- Device Control String */
2414                         case '_': /* APC -- Application Program Command */
2415                         case '^': /* PM -- Privacy Message */
2416                         case ']': /* OSC -- Operating System Command */
2417                         case 'k': /* old title set compatibility */
2418                                 strreset();
2419                                 strescseq.type = ascii;
2420                                 term.esc |= ESC_STR;
2421                                 break;
2422                         case '(': /* set primary charset G0 */
2423                                 term.esc |= ESC_ALTCHARSET;
2424                                 break;
2425                         case ')': /* set secondary charset G1 (IGNORED) */
2426                         case '*': /* set tertiary charset G2 (IGNORED) */
2427                         case '+': /* set quaternary charset G3 (IGNORED) */
2428                                 term.esc = 0;
2429                                 break;
2430                         case 'D': /* IND -- Linefeed */
2431                                 if(term.c.y == term.bot) {
2432                                         tscrollup(term.top, 1);
2433                                 } else {
2434                                         tmoveto(term.c.x, term.c.y+1);
2435                                 }
2436                                 term.esc = 0;
2437                                 break;
2438                         case 'E': /* NEL -- Next line */
2439                                 tnewline(1); /* always go to first col */
2440                                 term.esc = 0;
2441                                 break;
2442                         case 'H': /* HTS -- Horizontal tab stop */
2443                                 term.tabs[term.c.x] = 1;
2444                                 term.esc = 0;
2445                                 break;
2446                         case 'M': /* RI -- Reverse index */
2447                                 if(term.c.y == term.top) {
2448                                         tscrolldown(term.top, 1);
2449                                 } else {
2450                                         tmoveto(term.c.x, term.c.y-1);
2451                                 }
2452                                 term.esc = 0;
2453                                 break;
2454                         case 'Z': /* DECID -- Identify Terminal */
2455                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2456                                 term.esc = 0;
2457                                 break;
2458                         case 'c': /* RIS -- Reset to inital state */
2459                                 treset();
2460                                 term.esc = 0;
2461                                 xresettitle();
2462                                 xloadcols();
2463                                 break;
2464                         case '=': /* DECPAM -- Application keypad */
2465                                 term.mode |= MODE_APPKEYPAD;
2466                                 term.esc = 0;
2467                                 break;
2468                         case '>': /* DECPNM -- Normal keypad */
2469                                 term.mode &= ~MODE_APPKEYPAD;
2470                                 term.esc = 0;
2471                                 break;
2472                         case '7': /* DECSC -- Save Cursor */
2473                                 tcursor(CURSOR_SAVE);
2474                                 term.esc = 0;
2475                                 break;
2476                         case '8': /* DECRC -- Restore Cursor */
2477                                 tcursor(CURSOR_LOAD);
2478                                 term.esc = 0;
2479                                 break;
2480                         case '\\': /* ST -- Stop */
2481                                 term.esc = 0;
2482                                 break;
2483                         default:
2484                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2485                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2486                                 term.esc = 0;
2487                         }
2488                 }
2489                 /*
2490                  * All characters which form part of a sequence are not
2491                  * printed
2492                  */
2493                 return;
2494         }
2495         /*
2496          * Display control codes only if we are in graphic mode
2497          */
2498         if(control && !(term.c.attr.mode & ATTR_GFX))
2499                 return;
2500         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2501                 selclear(NULL);
2502         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2503                 term.line[term.c.y][term.c.x].mode |= ATTR_WRAP;
2504                 tnewline(1);
2505         }
2506
2507         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col) {
2508                 memmove(&term.line[term.c.y][term.c.x+1],
2509                         &term.line[term.c.y][term.c.x],
2510                         (term.col - term.c.x - 1) * sizeof(Glyph));
2511         }
2512
2513         if(term.c.x+width > term.col)
2514                 tnewline(1);
2515
2516         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2517
2518         if(width == 2) {
2519                 term.line[term.c.y][term.c.x].mode |= ATTR_WIDE;
2520                 if(term.c.x+1 < term.col) {
2521                         term.line[term.c.y][term.c.x+1].c[0] = '\0';
2522                         term.line[term.c.y][term.c.x+1].mode = ATTR_WDUMMY;
2523                 }
2524         }
2525         if(term.c.x+width < term.col) {
2526                 tmoveto(term.c.x+width, term.c.y);
2527         } else {
2528                 term.c.state |= CURSOR_WRAPNEXT;
2529         }
2530 }
2531
2532 int
2533 tresize(int col, int row) {
2534         int i;
2535         int minrow = MIN(row, term.row);
2536         int mincol = MIN(col, term.col);
2537         int slide = term.c.y - row + 1;
2538         bool *bp;
2539         Line *orig;
2540
2541         if(col < 1 || row < 1)
2542                 return 0;
2543
2544         /* free unneeded rows */
2545         i = 0;
2546         if(slide > 0) {
2547                 /*
2548                  * slide screen to keep cursor where we expect it -
2549                  * tscrollup would work here, but we can optimize to
2550                  * memmove because we're freeing the earlier lines
2551                  */
2552                 for(/* i = 0 */; i < slide; i++) {
2553                         free(term.line[i]);
2554                         free(term.alt[i]);
2555                 }
2556                 memmove(term.line, term.line + slide, row * sizeof(Line));
2557                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2558         }
2559         for(i += row; i < term.row; i++) {
2560                 free(term.line[i]);
2561                 free(term.alt[i]);
2562         }
2563
2564         /* resize to new height */
2565         term.line = xrealloc(term.line, row * sizeof(Line));
2566         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2567         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2568         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2569
2570         /* resize each row to new width, zero-pad if needed */
2571         for(i = 0; i < minrow; i++) {
2572                 term.dirty[i] = 1;
2573                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2574                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2575         }
2576
2577         /* allocate any new rows */
2578         for(/* i == minrow */; i < row; i++) {
2579                 term.dirty[i] = 1;
2580                 term.line[i] = xmalloc(col * sizeof(Glyph));
2581                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2582         }
2583         if(col > term.col) {
2584                 bp = term.tabs + term.col;
2585
2586                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2587                 while(--bp > term.tabs && !*bp)
2588                         /* nothing */ ;
2589                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2590                         *bp = 1;
2591         }
2592         /* update terminal size */
2593         term.col = col;
2594         term.row = row;
2595         /* reset scrolling region */
2596         tsetscroll(0, row-1);
2597         /* make use of the LIMIT in tmoveto */
2598         tmoveto(term.c.x, term.c.y);
2599         /* Clearing both screens */
2600         orig = term.line;
2601         do {
2602                 if(mincol < col && 0 < minrow) {
2603                         tclearregion(mincol, 0, col - 1, minrow - 1);
2604                 }
2605                 if(0 < col && minrow < row) {
2606                         tclearregion(0, minrow, col - 1, row - 1);
2607                 }
2608                 tswapscreen();
2609         } while(orig != term.line);
2610
2611         return (slide > 0);
2612 }
2613
2614 void
2615 xresize(int col, int row) {
2616         xw.tw = MAX(1, col * xw.cw);
2617         xw.th = MAX(1, row * xw.ch);
2618
2619         XFreePixmap(xw.dpy, xw.buf);
2620         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2621                         DefaultDepth(xw.dpy, xw.scr));
2622         XftDrawChange(xw.draw, xw.buf);
2623         xclear(0, 0, xw.w, xw.h);
2624 }
2625
2626 static inline ushort
2627 sixd_to_16bit(int x) {
2628         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2629 }
2630
2631 void
2632 xloadcols(void) {
2633         int i, r, g, b;
2634         XRenderColor color = { .alpha = 0xffff };
2635         static bool loaded;
2636         Colour *cp;
2637
2638         if(loaded) {
2639                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2640                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2641         }
2642
2643         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2644         for(i = 0; i < LEN(colorname); i++) {
2645                 if(!colorname[i])
2646                         continue;
2647                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2648                         die("Could not allocate color '%s'\n", colorname[i]);
2649                 }
2650         }
2651
2652         /* load colors [16-255] ; same colors as xterm */
2653         for(i = 16, r = 0; r < 6; r++) {
2654                 for(g = 0; g < 6; g++) {
2655                         for(b = 0; b < 6; b++) {
2656                                 color.red = sixd_to_16bit(r);
2657                                 color.green = sixd_to_16bit(g);
2658                                 color.blue = sixd_to_16bit(b);
2659                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i])) {
2660                                         die("Could not allocate color %d\n", i);
2661                                 }
2662                                 i++;
2663                         }
2664                 }
2665         }
2666
2667         for(r = 0; r < 24; r++, i++) {
2668                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
2669                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
2670                                         &dc.col[i])) {
2671                         die("Could not allocate color %d\n", i);
2672                 }
2673         }
2674         loaded = true;
2675 }
2676
2677 int
2678 xsetcolorname(int x, const char *name) {
2679         XRenderColor color = { .alpha = 0xffff };
2680         Colour colour;
2681         if (x < 0 || x > LEN(colorname))
2682                 return -1;
2683         if(!name) {
2684                 if(16 <= x && x < 16 + 216) {
2685                         int r = (x - 16) / 36, g = ((x - 16) % 36) / 6, b = (x - 16) % 6;
2686                         color.red = sixd_to_16bit(r);
2687                         color.green = sixd_to_16bit(g);
2688                         color.blue = sixd_to_16bit(b);
2689                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2690                                 return 0; /* something went wrong */
2691                         dc.col[x] = colour;
2692                         return 1;
2693                 } else if (16 + 216 <= x && x < 256) {
2694                         color.red = color.green = color.blue = 0x0808 + 0x0a0a * (x - (16 + 216));
2695                         if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &colour))
2696                                 return 0; /* something went wrong */
2697                         dc.col[x] = colour;
2698                         return 1;
2699                 } else {
2700                         name = colorname[x];
2701                 }
2702         }
2703         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &colour))
2704                 return 0;
2705         dc.col[x] = colour;
2706         return 1;
2707 }
2708
2709 void
2710 xtermclear(int col1, int row1, int col2, int row2) {
2711         XftDrawRect(xw.draw,
2712                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2713                         borderpx + col1 * xw.cw,
2714                         borderpx + row1 * xw.ch,
2715                         (col2-col1+1) * xw.cw,
2716                         (row2-row1+1) * xw.ch);
2717 }
2718
2719 /*
2720  * Absolute coordinates.
2721  */
2722 void
2723 xclear(int x1, int y1, int x2, int y2) {
2724         XftDrawRect(xw.draw,
2725                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2726                         x1, y1, x2-x1, y2-y1);
2727 }
2728
2729 void
2730 xhints(void) {
2731         XClassHint class = {opt_class ? opt_class : termname, termname};
2732         XWMHints wm = {.flags = InputHint, .input = 1};
2733         XSizeHints *sizeh = NULL;
2734
2735         sizeh = XAllocSizeHints();
2736         if(xw.isfixed == False) {
2737                 sizeh->flags = PSize | PResizeInc | PBaseSize;
2738                 sizeh->height = xw.h;
2739                 sizeh->width = xw.w;
2740                 sizeh->height_inc = xw.ch;
2741                 sizeh->width_inc = xw.cw;
2742                 sizeh->base_height = 2 * borderpx;
2743                 sizeh->base_width = 2 * borderpx;
2744         } else {
2745                 sizeh->flags = PMaxSize | PMinSize;
2746                 sizeh->min_width = sizeh->max_width = xw.fw;
2747                 sizeh->min_height = sizeh->max_height = xw.fh;
2748         }
2749
2750         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
2751         XFree(sizeh);
2752 }
2753
2754 int
2755 xloadfont(Font *f, FcPattern *pattern) {
2756         FcPattern *match;
2757         FcResult result;
2758
2759         match = FcFontMatch(NULL, pattern, &result);
2760         if(!match)
2761                 return 1;
2762
2763         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2764                 FcPatternDestroy(match);
2765                 return 1;
2766         }
2767
2768         f->set = NULL;
2769         f->pattern = FcPatternDuplicate(pattern);
2770
2771         f->ascent = f->match->ascent;
2772         f->descent = f->match->descent;
2773         f->lbearing = 0;
2774         f->rbearing = f->match->max_advance_width;
2775
2776         f->height = f->ascent + f->descent;
2777         f->width = f->lbearing + f->rbearing;
2778
2779         return 0;
2780 }
2781
2782 void
2783 xloadfonts(char *fontstr, int fontsize) {
2784         FcPattern *pattern;
2785         FcResult result;
2786         double fontval;
2787
2788         if(fontstr[0] == '-') {
2789                 pattern = XftXlfdParse(fontstr, False, False);
2790         } else {
2791                 pattern = FcNameParse((FcChar8 *)fontstr);
2792         }
2793
2794         if(!pattern)
2795                 die("st: can't open font %s\n", fontstr);
2796
2797         if(fontsize > 0) {
2798                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2799                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2800                 usedfontsize = fontsize;
2801         } else {
2802                 result = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2803                 if(result == FcResultMatch) {
2804                         usedfontsize = (int)fontval;
2805                 } else {
2806                         /*
2807                          * Default font size is 12, if none given. This is to
2808                          * have a known usedfontsize value.
2809                          */
2810                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2811                         usedfontsize = 12;
2812                 }
2813         }
2814
2815         FcConfigSubstitute(0, pattern, FcMatchPattern);
2816         FcDefaultSubstitute(pattern);
2817
2818         if(xloadfont(&dc.font, pattern))
2819                 die("st: can't open font %s\n", fontstr);
2820
2821         /* Setting character width and height. */
2822         xw.cw = CEIL(dc.font.width * cwscale);
2823         xw.ch = CEIL(dc.font.height * chscale);
2824
2825         FcPatternDel(pattern, FC_SLANT);
2826         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2827         if(xloadfont(&dc.ifont, pattern))
2828                 die("st: can't open font %s\n", fontstr);
2829
2830         FcPatternDel(pattern, FC_WEIGHT);
2831         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2832         if(xloadfont(&dc.ibfont, pattern))
2833                 die("st: can't open font %s\n", fontstr);
2834
2835         FcPatternDel(pattern, FC_SLANT);
2836         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
2837         if(xloadfont(&dc.bfont, pattern))
2838                 die("st: can't open font %s\n", fontstr);
2839
2840         FcPatternDestroy(pattern);
2841 }
2842
2843 int
2844 xloadfontset(Font *f) {
2845         FcResult result;
2846
2847         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
2848                 return 1;
2849         return 0;
2850 }
2851
2852 void
2853 xunloadfont(Font *f) {
2854         XftFontClose(xw.dpy, f->match);
2855         FcPatternDestroy(f->pattern);
2856         if(f->set)
2857                 FcFontSetDestroy(f->set);
2858 }
2859
2860 void
2861 xunloadfonts(void) {
2862         int i;
2863
2864         /* Free the loaded fonts in the font cache.  */
2865         for(i = 0; i < frclen; i++) {
2866                 XftFontClose(xw.dpy, frc[i].font);
2867         }
2868         frclen = 0;
2869
2870         xunloadfont(&dc.font);
2871         xunloadfont(&dc.bfont);
2872         xunloadfont(&dc.ifont);
2873         xunloadfont(&dc.ibfont);
2874 }
2875
2876 void
2877 xzoom(const Arg *arg) {
2878         xunloadfonts();
2879         xloadfonts(usedfont, usedfontsize + arg->i);
2880         cresize(0, 0);
2881         redraw(0);
2882 }
2883
2884 void
2885 xinit(void) {
2886         XGCValues gcvalues;
2887         Cursor cursor;
2888         Window parent;
2889         int sw, sh;
2890
2891         if(!(xw.dpy = XOpenDisplay(NULL)))
2892                 die("Can't open display\n");
2893         xw.scr = XDefaultScreen(xw.dpy);
2894         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
2895
2896         /* font */
2897         if(!FcInit())
2898                 die("Could not init fontconfig.\n");
2899
2900         usedfont = (opt_font == NULL)? font : opt_font;
2901         xloadfonts(usedfont, 0);
2902
2903         /* colors */
2904         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
2905         xloadcols();
2906
2907         /* adjust fixed window geometry */
2908         if(xw.isfixed) {
2909                 sw = DisplayWidth(xw.dpy, xw.scr);
2910                 sh = DisplayHeight(xw.dpy, xw.scr);
2911                 if(xw.fx < 0)
2912                         xw.fx = sw + xw.fx - xw.fw - 1;
2913                 if(xw.fy < 0)
2914                         xw.fy = sh + xw.fy - xw.fh - 1;
2915
2916                 xw.h = xw.fh;
2917                 xw.w = xw.fw;
2918         } else {
2919                 /* window - default size */
2920                 xw.h = 2 * borderpx + term.row * xw.ch;
2921                 xw.w = 2 * borderpx + term.col * xw.cw;
2922                 xw.fx = 0;
2923                 xw.fy = 0;
2924         }
2925
2926         /* Events */
2927         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
2928         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
2929         xw.attrs.bit_gravity = NorthWestGravity;
2930         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
2931                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
2932                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
2933         xw.attrs.colormap = xw.cmap;
2934
2935         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
2936                         XRootWindow(xw.dpy, xw.scr);
2937         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
2938                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
2939                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
2940                         | CWEventMask | CWColormap, &xw.attrs);
2941
2942         memset(&gcvalues, 0, sizeof(gcvalues));
2943         gcvalues.graphics_exposures = False;
2944         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
2945                         &gcvalues);
2946         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2947                         DefaultDepth(xw.dpy, xw.scr));
2948         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
2949         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
2950
2951         /* Xft rendering context */
2952         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
2953
2954         /* input methods */
2955         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
2956                 XSetLocaleModifiers("@im=local");
2957                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
2958                         XSetLocaleModifiers("@im=");
2959                         if((xw.xim = XOpenIM(xw.dpy,
2960                                         NULL, NULL, NULL)) == NULL) {
2961                                 die("XOpenIM failed. Could not open input"
2962                                         " device.\n");
2963                         }
2964                 }
2965         }
2966         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
2967                                            | XIMStatusNothing, XNClientWindow, xw.win,
2968                                            XNFocusWindow, xw.win, NULL);
2969         if(xw.xic == NULL)
2970                 die("XCreateIC failed. Could not obtain input method.\n");
2971
2972         /* white cursor, black outline */
2973         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
2974         XDefineCursor(xw.dpy, xw.win, cursor);
2975         XRecolorCursor(xw.dpy, cursor,
2976                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
2977                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
2978
2979         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
2980         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
2981         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
2982
2983         xresettitle();
2984         XMapWindow(xw.dpy, xw.win);
2985         xhints();
2986         XSync(xw.dpy, 0);
2987 }
2988
2989 void
2990 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
2991         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
2992             width = charlen * xw.cw, xp, i;
2993         int frcflags;
2994         int u8fl, u8fblen, u8cblen, doesexist;
2995         char *u8c, *u8fs;
2996         long u8char;
2997         Font *font = &dc.font;
2998         FcResult fcres;
2999         FcPattern *fcpattern, *fontpattern;
3000         FcFontSet *fcsets[] = { NULL };
3001         FcCharSet *fccharset;
3002         Colour *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3003         XRenderColor colfg, colbg;
3004         Rectangle r;
3005         int oneatatime;
3006
3007         frcflags = FRC_NORMAL;
3008
3009         if(base.mode & ATTR_ITALIC) {
3010                 if(base.fg == defaultfg)
3011                         base.fg = defaultitalic;
3012                 font = &dc.ifont;
3013                 frcflags = FRC_ITALIC;
3014         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3015                 if(base.fg == defaultfg)
3016                         base.fg = defaultitalic;
3017                 font = &dc.ibfont;
3018                 frcflags = FRC_ITALICBOLD;
3019         } else if(base.mode & ATTR_UNDERLINE) {
3020                 if(base.fg == defaultfg)
3021                         base.fg = defaultunderline;
3022         }
3023         if(IS_TRUECOL(base.fg)) {
3024                 colfg.red = TRUERED(base.fg);
3025                 colfg.green = TRUEGREEN(base.fg);
3026                 colfg.blue = TRUEBLUE(base.fg);
3027                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3028                 fg = &truefg;
3029         } else {
3030                 fg = &dc.col[base.fg];
3031         }
3032
3033         if(IS_TRUECOL(base.bg)) {
3034                 colbg.green = TRUEGREEN(base.bg);
3035                 colbg.red = TRUERED(base.bg);
3036                 colbg.blue = TRUEBLUE(base.bg);
3037                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3038                 bg = &truebg;
3039         } else {
3040                 bg = &dc.col[base.bg];
3041         }
3042
3043
3044
3045         if(base.mode & ATTR_BOLD) {
3046                 if(BETWEEN(base.fg, 0, 7)) {
3047                         /* basic system colors */
3048                         fg = &dc.col[base.fg + 8];
3049                 } else if(BETWEEN(base.fg, 16, 195)) {
3050                         /* 256 colors */
3051                         fg = &dc.col[base.fg + 36];
3052                 } else if(BETWEEN(base.fg, 232, 251)) {
3053                         /* greyscale */
3054                         fg = &dc.col[base.fg + 4];
3055                 }
3056                 /*
3057                  * Those ranges will not be brightened:
3058                  *    8 - 15 – bright system colors
3059                  *    196 - 231 – highest 256 color cube
3060                  *    252 - 255 – brightest colors in greyscale
3061                  */
3062                 font = &dc.bfont;
3063                 frcflags = FRC_BOLD;
3064         }
3065
3066         if(IS_SET(MODE_REVERSE)) {
3067                 if(fg == &dc.col[defaultfg]) {
3068                         fg = &dc.col[defaultbg];
3069                 } else {
3070                         colfg.red = ~fg->color.red;
3071                         colfg.green = ~fg->color.green;
3072                         colfg.blue = ~fg->color.blue;
3073                         colfg.alpha = fg->color.alpha;
3074                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3075                         fg = &revfg;
3076                 }
3077
3078                 if(bg == &dc.col[defaultbg]) {
3079                         bg = &dc.col[defaultfg];
3080                 } else {
3081                         colbg.red = ~bg->color.red;
3082                         colbg.green = ~bg->color.green;
3083                         colbg.blue = ~bg->color.blue;
3084                         colbg.alpha = bg->color.alpha;
3085                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &revbg);
3086                         bg = &revbg;
3087                 }
3088         }
3089
3090         if(base.mode & ATTR_REVERSE) {
3091                 temp = fg;
3092                 fg = bg;
3093                 bg = temp;
3094         }
3095
3096         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3097                 fg = bg;
3098
3099         /* Intelligent cleaning up of the borders. */
3100         if(x == 0) {
3101                 xclear(0, (y == 0)? 0 : winy, borderpx,
3102                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3103         }
3104         if(x + charlen >= term.col) {
3105                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3106                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3107         }
3108         if(y == 0)
3109                 xclear(winx, 0, winx + width, borderpx);
3110         if(y == term.row-1)
3111                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3112
3113         /* Clean up the region we want to draw to. */
3114         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3115
3116         /* Set the clip region because Xft is sometimes dirty. */
3117         r.x = 0;
3118         r.y = 0;
3119         r.height = xw.ch;
3120         r.width = width;
3121         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3122
3123         for(xp = winx; bytelen > 0;) {
3124                 /*
3125                  * Search for the range in the to be printed string of glyphs
3126                  * that are in the main font. Then print that range. If
3127                  * some glyph is found that is not in the font, do the
3128                  * fallback dance.
3129                  */
3130                 u8fs = s;
3131                 u8fblen = 0;
3132                 u8fl = 0;
3133                 oneatatime = font->width != xw.cw;
3134                 for(;;) {
3135                         u8c = s;
3136                         u8cblen = utf8decode(s, &u8char);
3137                         s += u8cblen;
3138                         bytelen -= u8cblen;
3139
3140                         doesexist = XftCharExists(xw.dpy, font->match, u8char);
3141                         if(oneatatime || !doesexist || bytelen <= 0) {
3142                                 if(oneatatime || bytelen <= 0) {
3143                                         if(doesexist) {
3144                                                 u8fl++;
3145                                                 u8fblen += u8cblen;
3146                                         }
3147                                 }
3148
3149                                 if(u8fl > 0) {
3150                                         XftDrawStringUtf8(xw.draw, fg,
3151                                                         font->match, xp,
3152                                                         winy + font->ascent,
3153                                                         (FcChar8 *)u8fs,
3154                                                         u8fblen);
3155                                         xp += xw.cw * u8fl;
3156
3157                                 }
3158                                 break;
3159                         }
3160
3161                         u8fl++;
3162                         u8fblen += u8cblen;
3163                 }
3164                 if(doesexist) {
3165                         if (oneatatime)
3166                                 continue;
3167                         break;
3168                 }
3169
3170                 /* Search the font cache. */
3171                 for(i = 0; i < frclen; i++) {
3172                         if(XftCharExists(xw.dpy, frc[i].font, u8char)
3173                                         && frc[i].flags == frcflags) {
3174                                 break;
3175                         }
3176                 }
3177
3178                 /* Nothing was found. */
3179                 if(i >= frclen) {
3180                         if(!font->set)
3181                                 xloadfontset(font);
3182                         fcsets[0] = font->set;
3183
3184                         /*
3185                          * Nothing was found in the cache. Now use
3186                          * some dozen of Fontconfig calls to get the
3187                          * font for one single character.
3188                          */
3189                         fcpattern = FcPatternDuplicate(font->pattern);
3190                         fccharset = FcCharSetCreate();
3191
3192                         FcCharSetAddChar(fccharset, u8char);
3193                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3194                                         fccharset);
3195                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3196                                         FcTrue);
3197
3198                         FcConfigSubstitute(0, fcpattern,
3199                                         FcMatchPattern);
3200                         FcDefaultSubstitute(fcpattern);
3201
3202                         fontpattern = FcFontSetMatch(0, fcsets,
3203                                         FcTrue, fcpattern, &fcres);
3204
3205                         /*
3206                          * Overwrite or create the new cache entry.
3207                          */
3208                         if(frclen >= LEN(frc)) {
3209                                 frclen = LEN(frc) - 1;
3210                                 XftFontClose(xw.dpy, frc[frclen].font);
3211                         }
3212
3213                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3214                                         fontpattern);
3215                         frc[frclen].flags = frcflags;
3216
3217                         i = frclen;
3218                         frclen++;
3219
3220                         FcPatternDestroy(fcpattern);
3221                         FcCharSetDestroy(fccharset);
3222                 }
3223
3224                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3225                                 xp, winy + frc[i].font->ascent,
3226                                 (FcChar8 *)u8c, u8cblen);
3227
3228                 xp += xw.cw * wcwidth(u8char);
3229         }
3230
3231         /*
3232         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3233                         winy + font->ascent, (FcChar8 *)s, bytelen);
3234         */
3235
3236         if(base.mode & ATTR_UNDERLINE) {
3237                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3238                                 width, 1);
3239         }
3240
3241         /* Reset clip to none. */
3242         XftDrawSetClip(xw.draw, 0);
3243 }
3244
3245 void
3246 xdrawcursor(void) {
3247         static int oldx = 0, oldy = 0;
3248         int sl, width, curx;
3249         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3250
3251         LIMIT(oldx, 0, term.col-1);
3252         LIMIT(oldy, 0, term.row-1);
3253
3254         curx = term.c.x;
3255
3256         /* adjust position if in dummy */
3257         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3258                 oldx--;
3259         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3260                 curx--;
3261
3262         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3263
3264         /* remove the old cursor */
3265         sl = utf8size(term.line[oldy][oldx].c);
3266         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3267         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3268                         oldy, width, sl);
3269
3270         /* draw the new one */
3271         if(!(IS_SET(MODE_HIDE))) {
3272                 if(xw.state & WIN_FOCUSED) {
3273                         if(IS_SET(MODE_REVERSE)) {
3274                                 g.mode |= ATTR_REVERSE;
3275                                 g.fg = defaultcs;
3276                                 g.bg = defaultfg;
3277                         }
3278
3279                         sl = utf8size(g.c);
3280                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3281                                 ? 2 : 1;
3282                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3283                 } else {
3284                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3285                                         borderpx + curx * xw.cw,
3286                                         borderpx + term.c.y * xw.ch,
3287                                         xw.cw - 1, 1);
3288                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3289                                         borderpx + curx * xw.cw,
3290                                         borderpx + term.c.y * xw.ch,
3291                                         1, xw.ch - 1);
3292                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3293                                         borderpx + (curx + 1) * xw.cw - 1,
3294                                         borderpx + term.c.y * xw.ch,
3295                                         1, xw.ch - 1);
3296                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3297                                         borderpx + curx * xw.cw,
3298                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3299                                         xw.cw, 1);
3300                 }
3301                 oldx = curx, oldy = term.c.y;
3302         }
3303 }
3304
3305
3306 void
3307 xsettitle(char *p) {
3308         XTextProperty prop;
3309
3310         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3311                         &prop);
3312         XSetWMName(xw.dpy, xw.win, &prop);
3313         XFree(prop.value);
3314 }
3315
3316 void
3317 xresettitle(void) {
3318         xsettitle(opt_title ? opt_title : "st");
3319 }
3320
3321 void
3322 redraw(int timeout) {
3323         struct timespec tv = {0, timeout * 1000};
3324
3325         tfulldirt();
3326         draw();
3327
3328         if(timeout > 0) {
3329                 nanosleep(&tv, NULL);
3330                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3331         }
3332 }
3333
3334 void
3335 draw(void) {
3336         drawregion(0, 0, term.col, term.row);
3337         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3338                         xw.h, 0, 0);
3339         XSetForeground(xw.dpy, dc.gc,
3340                         dc.col[IS_SET(MODE_REVERSE)?
3341                                 defaultfg : defaultbg].pixel);
3342 }
3343
3344 void
3345 drawregion(int x1, int y1, int x2, int y2) {
3346         int ic, ib, x, y, ox, sl;
3347         Glyph base, new;
3348         char buf[DRAW_BUF_SIZ];
3349         bool ena_sel = sel.ob.x != -1;
3350         long u8char;
3351
3352         if(sel.alt ^ IS_SET(MODE_ALTSCREEN))
3353                 ena_sel = 0;
3354
3355         if(!(xw.state & WIN_VISIBLE))
3356                 return;
3357
3358         for(y = y1; y < y2; y++) {
3359                 if(!term.dirty[y])
3360                         continue;
3361
3362                 xtermclear(0, y, term.col, y);
3363                 term.dirty[y] = 0;
3364                 base = term.line[y][0];
3365                 ic = ib = ox = 0;
3366                 for(x = x1; x < x2; x++) {
3367                         new = term.line[y][x];
3368                         if(new.mode == ATTR_WDUMMY)
3369                                 continue;
3370                         if(ena_sel && selected(x, y))
3371                                 new.mode ^= ATTR_REVERSE;
3372                         if(ib > 0 && (ATTRCMP(base, new)
3373                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3374                                 xdraws(buf, base, ox, y, ic, ib);
3375                                 ic = ib = 0;
3376                         }
3377                         if(ib == 0) {
3378                                 ox = x;
3379                                 base = new;
3380                         }
3381
3382                         sl = utf8decode(new.c, &u8char);
3383                         memcpy(buf+ib, new.c, sl);
3384                         ib += sl;
3385                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3386                 }
3387                 if(ib > 0)
3388                         xdraws(buf, base, ox, y, ic, ib);
3389         }
3390         xdrawcursor();
3391 }
3392
3393 void
3394 expose(XEvent *ev) {
3395         XExposeEvent *e = &ev->xexpose;
3396
3397         if(xw.state & WIN_REDRAW) {
3398                 if(!e->count)
3399                         xw.state &= ~WIN_REDRAW;
3400         }
3401         redraw(0);
3402 }
3403
3404 void
3405 visibility(XEvent *ev) {
3406         XVisibilityEvent *e = &ev->xvisibility;
3407
3408         if(e->state == VisibilityFullyObscured) {
3409                 xw.state &= ~WIN_VISIBLE;
3410         } else if(!(xw.state & WIN_VISIBLE)) {
3411                 /* need a full redraw for next Expose, not just a buf copy */
3412                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3413         }
3414 }
3415
3416 void
3417 unmap(XEvent *ev) {
3418         xw.state &= ~WIN_VISIBLE;
3419 }
3420
3421 void
3422 xsetpointermotion(int set) {
3423         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3424         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3425 }
3426
3427 void
3428 xseturgency(int add) {
3429         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3430
3431         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
3432         XSetWMHints(xw.dpy, xw.win, h);
3433         XFree(h);
3434 }
3435
3436 void
3437 focus(XEvent *ev) {
3438         XFocusChangeEvent *e = &ev->xfocus;
3439
3440         if(e->mode == NotifyGrab)
3441                 return;
3442
3443         if(ev->type == FocusIn) {
3444                 XSetICFocus(xw.xic);
3445                 xw.state |= WIN_FOCUSED;
3446                 xseturgency(0);
3447                 if(IS_SET(MODE_FOCUS))
3448                         ttywrite("\033[I", 3);
3449         } else {
3450                 XUnsetICFocus(xw.xic);
3451                 xw.state &= ~WIN_FOCUSED;
3452                 if(IS_SET(MODE_FOCUS))
3453                         ttywrite("\033[O", 3);
3454         }
3455 }
3456
3457 static inline bool
3458 match(uint mask, uint state) {
3459         state &= ~ignoremod;
3460
3461         if(mask == XK_NO_MOD && state)
3462                 return false;
3463         if(mask != XK_ANY_MOD && mask != XK_NO_MOD && !state)
3464                 return false;
3465         if(mask == XK_ANY_MOD)
3466                 return true;
3467         return state == mask;
3468 }
3469
3470 void
3471 numlock(const Arg *dummy) {
3472         term.numlock ^= 1;
3473 }
3474
3475 char*
3476 kmap(KeySym k, uint state) {
3477         Key *kp;
3478         int i;
3479
3480         /* Check for mapped keys out of X11 function keys. */
3481         for(i = 0; i < LEN(mappedkeys); i++) {
3482                 if(mappedkeys[i] == k)
3483                         break;
3484         }
3485         if(i == LEN(mappedkeys)) {
3486                 if((k & 0xFFFF) < 0xFD00)
3487                         return NULL;
3488         }
3489
3490         for(kp = key; kp < key + LEN(key); kp++) {
3491                 if(kp->k != k)
3492                         continue;
3493
3494                 if(!match(kp->mask, state))
3495                         continue;
3496
3497                 if(kp->appkey > 0) {
3498                         if(!IS_SET(MODE_APPKEYPAD))
3499                                 continue;
3500                         if(term.numlock && kp->appkey == 2)
3501                                 continue;
3502                 } else if(kp->appkey < 0 && IS_SET(MODE_APPKEYPAD)) {
3503                         continue;
3504                 }
3505
3506                 if((kp->appcursor < 0 && IS_SET(MODE_APPCURSOR)) ||
3507                                 (kp->appcursor > 0
3508                                  && !IS_SET(MODE_APPCURSOR))) {
3509                         continue;
3510                 }
3511
3512                 if((kp->crlf < 0 && IS_SET(MODE_CRLF)) ||
3513                                 (kp->crlf > 0 && !IS_SET(MODE_CRLF))) {
3514                         continue;
3515                 }
3516
3517                 return kp->s;
3518         }
3519
3520         return NULL;
3521 }
3522
3523 void
3524 kpress(XEvent *ev) {
3525         XKeyEvent *e = &ev->xkey;
3526         KeySym ksym;
3527         char xstr[31], buf[32], *customkey, *cp = buf;
3528         int len, ret;
3529         long c;
3530         Status status;
3531         Shortcut *bp;
3532
3533         if(IS_SET(MODE_KBDLOCK))
3534                 return;
3535
3536         len = XmbLookupString(xw.xic, e, xstr, sizeof(xstr), &ksym, &status);
3537         e->state &= ~Mod2Mask;
3538         /* 1. shortcuts */
3539         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3540                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3541                         bp->func(&(bp->arg));
3542                         return;
3543                 }
3544         }
3545
3546         /* 2. custom keys from config.h */
3547         if((customkey = kmap(ksym, e->state))) {
3548                 len = strlen(customkey);
3549                 memcpy(buf, customkey, len);
3550         /* 3. hardcoded (overrides X lookup) */
3551         } else {
3552                 if(len == 0)
3553                         return;
3554
3555                 if(len == 1 && e->state & Mod1Mask) {
3556                         if(IS_SET(MODE_8BIT)) {
3557                                 if(*xstr < 0177) {
3558                                         c = *xstr | 0x80;
3559                                         ret = utf8encode(&c, cp);
3560                                         cp += ret;
3561                                         len = 0;
3562                                 }
3563                         } else {
3564                                 *cp++ = '\033';
3565                         }
3566                 }
3567
3568                 memcpy(cp, xstr, len);
3569                 len = cp - buf + len;
3570         }
3571
3572         ttywrite(buf, len);
3573         if(IS_SET(MODE_ECHO))
3574                 techo(buf, len);
3575 }
3576
3577
3578 void
3579 cmessage(XEvent *e) {
3580         /*
3581          * See xembed specs
3582          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3583          */
3584         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3585                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3586                         xw.state |= WIN_FOCUSED;
3587                         xseturgency(0);
3588                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3589                         xw.state &= ~WIN_FOCUSED;
3590                 }
3591         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3592                 /* Send SIGHUP to shell */
3593                 kill(pid, SIGHUP);
3594                 exit(EXIT_SUCCESS);
3595         }
3596 }
3597
3598 void
3599 cresize(int width, int height) {
3600         int col, row;
3601
3602         if(width != 0)
3603                 xw.w = width;
3604         if(height != 0)
3605                 xw.h = height;
3606
3607         col = (xw.w - 2 * borderpx) / xw.cw;
3608         row = (xw.h - 2 * borderpx) / xw.ch;
3609
3610         tresize(col, row);
3611         xresize(col, row);
3612         ttyresize();
3613 }
3614
3615 void
3616 resize(XEvent *e) {
3617         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3618                 return;
3619
3620         cresize(e->xconfigure.width, e->xconfigure.height);
3621 }
3622
3623 void
3624 run(void) {
3625         XEvent ev;
3626         int w = xw.w, h = xw.h;
3627         fd_set rfd;
3628         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3629         struct timeval drawtimeout, *tv = NULL, now, last, lastblink;
3630
3631         /* Waiting for window mapping */
3632         while(1) {
3633                 XNextEvent(xw.dpy, &ev);
3634                 if(ev.type == ConfigureNotify) {
3635                         w = ev.xconfigure.width;
3636                         h = ev.xconfigure.height;
3637                 } else if(ev.type == MapNotify) {
3638                         break;
3639                 }
3640         }
3641
3642         if(!xw.isfixed)
3643                 cresize(w, h);
3644         else
3645                 cresize(xw.fw, xw.fh);
3646         ttynew();
3647
3648         gettimeofday(&lastblink, NULL);
3649         gettimeofday(&last, NULL);
3650
3651         for(xev = actionfps;;) {
3652                 FD_ZERO(&rfd);
3653                 FD_SET(cmdfd, &rfd);
3654                 FD_SET(xfd, &rfd);
3655
3656                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
3657                         if(errno == EINTR)
3658                                 continue;
3659                         die("select failed: %s\n", SERRNO);
3660                 }
3661                 if(FD_ISSET(cmdfd, &rfd)) {
3662                         ttyread();
3663                         if(blinktimeout) {
3664                                 blinkset = tattrset(ATTR_BLINK);
3665                                 if(!blinkset)
3666                                         MODBIT(term.mode, 0, MODE_BLINK);
3667                         }
3668                 }
3669
3670                 if(FD_ISSET(xfd, &rfd))
3671                         xev = actionfps;
3672
3673                 gettimeofday(&now, NULL);
3674                 drawtimeout.tv_sec = 0;
3675                 drawtimeout.tv_usec = (1000/xfps) * 1000;
3676                 tv = &drawtimeout;
3677
3678                 dodraw = 0;
3679                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3680                         tsetdirtattr(ATTR_BLINK);
3681                         term.mode ^= MODE_BLINK;
3682                         gettimeofday(&lastblink, NULL);
3683                         dodraw = 1;
3684                 }
3685                 if(TIMEDIFF(now, last) \
3686                                 > (xev? (1000/xfps) : (1000/actionfps))) {
3687                         dodraw = 1;
3688                         last = now;
3689                 }
3690
3691                 if(dodraw) {
3692                         while(XPending(xw.dpy)) {
3693                                 XNextEvent(xw.dpy, &ev);
3694                                 if(XFilterEvent(&ev, None))
3695                                         continue;
3696                                 if(handler[ev.type])
3697                                         (handler[ev.type])(&ev);
3698                         }
3699
3700                         draw();
3701                         XFlush(xw.dpy);
3702
3703                         if(xev && !FD_ISSET(xfd, &rfd))
3704                                 xev--;
3705                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3706                                 if(blinkset) {
3707                                         if(TIMEDIFF(now, lastblink) \
3708                                                         > blinktimeout) {
3709                                                 drawtimeout.tv_usec = 1;
3710                                         } else {
3711                                                 drawtimeout.tv_usec = (1000 * \
3712                                                         (blinktimeout - \
3713                                                         TIMEDIFF(now,
3714                                                                 lastblink)));
3715                                         }
3716                                 } else {
3717                                         tv = NULL;
3718                                 }
3719                         }
3720                 }
3721         }
3722 }
3723
3724 void
3725 usage(void) {
3726         die("%s " VERSION " (c) 2010-2013 st engineers\n" \
3727         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]" \
3728         " [-t title] [-w windowid] [-e command ...]\n", argv0);
3729 }
3730
3731 int
3732 main(int argc, char *argv[]) {
3733         int bitm, xr, yr;
3734         uint wr, hr;
3735         char *titles;
3736
3737         xw.fw = xw.fh = xw.fx = xw.fy = 0;
3738         xw.isfixed = False;
3739
3740         ARGBEGIN {
3741         case 'a':
3742                 allowaltscreen = false;
3743                 break;
3744         case 'c':
3745                 opt_class = EARGF(usage());
3746                 break;
3747         case 'e':
3748                 /* eat all remaining arguments */
3749                 if(argc > 1) {
3750                         opt_cmd = &argv[1];
3751                         if(argv[1] != NULL && opt_title == NULL) {
3752                                 titles = strdup(argv[1]);
3753                                 opt_title = basename(titles);
3754                         }
3755                 }
3756                 goto run;
3757         case 'f':
3758                 opt_font = EARGF(usage());
3759                 break;
3760         case 'g':
3761                 bitm = XParseGeometry(EARGF(usage()), &xr, &yr, &wr, &hr);
3762                 if(bitm & XValue)
3763                         xw.fx = xr;
3764                 if(bitm & YValue)
3765                         xw.fy = yr;
3766                 if(bitm & WidthValue)
3767                         xw.fw = (int)wr;
3768                 if(bitm & HeightValue)
3769                         xw.fh = (int)hr;
3770                 if(bitm & XNegative && xw.fx == 0)
3771                         xw.fx = -1;
3772                 if(bitm & YNegative && xw.fy == 0)
3773                         xw.fy = -1;
3774
3775                 if(xw.fh != 0 && xw.fw != 0)
3776                         xw.isfixed = True;
3777                 break;
3778         case 'o':
3779                 opt_io = EARGF(usage());
3780                 break;
3781         case 't':
3782                 opt_title = EARGF(usage());
3783                 break;
3784         case 'w':
3785                 opt_embed = EARGF(usage());
3786                 break;
3787         case 'v':
3788         default:
3789                 usage();
3790         } ARGEND;
3791
3792 run:
3793         setlocale(LC_CTYPE, "");
3794         XSetLocaleModifiers("");
3795         tnew(80, 24);
3796         xinit();
3797         selinit();
3798         run();
3799
3800         return 0;
3801 }
3802