st.c

   1 /* See LICENSE for licence details. */
   2 #include <ctype.h>
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <limits.h>
   6 #include <locale.h>
   7 #include <pwd.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <stdint.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/select.h>
  17 #include <sys/stat.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <libgen.h>
  24 #include <X11/Xatom.h>
  25 #include <X11/Xlib.h>
  26 #include <X11/Xutil.h>
  27 #include <X11/cursorfont.h>
  28 #include <X11/keysym.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <fontconfig/fontconfig.h>
  31 #include <wchar.h>
  32
  33 #include "arg.h"
  34
  35 char *argv0;
  36
  37 #define Glyph Glyph_
  38 #define Font Font_
  39
  40 #if   defined(__linux)
  41  #include <pty.h>
  42 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  43  #include <util.h>
  44 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  45  #include <libutil.h>
  46 #endif
  47
  48
  49 /* XEMBED messages */
  50 #define XEMBED_FOCUS_IN  4
  51 #define XEMBED_FOCUS_OUT 5
  52
  53 /* Arbitrary sizes */
  54 #define UTF_INVALID   0xFFFD
  55 #define UTF_SIZ       4
  56 #define ESC_BUF_SIZ   (128*UTF_SIZ)
  57 #define ESC_ARG_SIZ   16
  58 #define STR_BUF_SIZ   ESC_BUF_SIZ
  59 #define STR_ARG_SIZ   ESC_ARG_SIZ
  60 #define DRAW_BUF_SIZ  20*1024
  61 #define XK_ANY_MOD    UINT_MAX
  62 #define XK_NO_MOD     0
  63 #define XK_SWITCH_MOD (1<<13)
  64
  65 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  66
  67 /* macros */
  68 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  69 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  70 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
  71 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  72 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  73 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == '\177')
  74 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
  75 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
  76 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  77 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  78 #define IS_SET(flag) ((term.mode & (flag)) != 0)
  79 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_nsec-t2.tv_nsec)/1E6)
  80 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
  81
  82 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
  83 #define IS_TRUECOL(x)    (1 << 24 & (x))
  84 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
  85 #define TRUEGREEN(x)     (((x) & 0xff00))
  86 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
  87
  88
  89 enum glyph_attribute {
  90         ATTR_NULL      = 0,
  91         ATTR_BOLD      = 1,
  92         ATTR_FAINT     = 2,
  93         ATTR_ITALIC    = 4,
  94         ATTR_UNDERLINE = 8,
  95         ATTR_BLINK     = 16,
  96         ATTR_REVERSE   = 32,
  97         ATTR_INVISIBLE = 64,
  98         ATTR_STRUCK    = 128,
  99         ATTR_WRAP      = 256,
 100         ATTR_WIDE      = 512,
 101         ATTR_WDUMMY    = 1024,
 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_PRINT       = 1048576,
 137         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
 138                           |MODE_MOUSEMANY,
 139 };
 140
 141 enum charset {
 142         CS_GRAPHIC0,
 143         CS_GRAPHIC1,
 144         CS_UK,
 145         CS_USA,
 146         CS_MULTI,
 147         CS_GER,
 148         CS_FIN
 149 };
 150
 151 enum escape_state {
 152         ESC_START      = 1,
 153         ESC_CSI        = 2,
 154         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
 155         ESC_ALTCHARSET = 8,
 156         ESC_STR_END    = 16, /* a final string was encountered */
 157         ESC_TEST       = 32, /* Enter in test mode */
 158 };
 159
 160 enum window_state {
 161         WIN_VISIBLE = 1,
 162         WIN_REDRAW  = 2,
 163         WIN_FOCUSED = 4
 164 };
 165
 166 enum selection_type {
 167         SEL_REGULAR = 1,
 168         SEL_RECTANGULAR = 2
 169 };
 170
 171 enum selection_snap {
 172         SNAP_WORD = 1,
 173         SNAP_LINE = 2
 174 };
 175
 176 typedef unsigned char uchar;
 177 typedef unsigned int uint;
 178 typedef unsigned long ulong;
 179 typedef unsigned short ushort;
 180
 181 typedef XftDraw *Draw;
 182 typedef XftColor Color;
 183
 184 typedef struct {
 185         char c[UTF_SIZ]; /* character code */
 186         ushort mode;      /* attribute flags */
 187         uint32_t fg;      /* foreground  */
 188         uint32_t bg;      /* background  */
 189 } Glyph;
 190
 191 typedef Glyph *Line;
 192
 193 typedef struct {
 194         Glyph attr; /* current char attributes */
 195         int x;
 196         int y;
 197         char state;
 198 } TCursor;
 199
 200 /* CSI Escape sequence structs */
 201 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 202 typedef struct {
 203         char buf[ESC_BUF_SIZ]; /* raw string */
 204         int len;               /* raw string length */
 205         char priv;
 206         int arg[ESC_ARG_SIZ];
 207         int narg;              /* nb of args */
 208         char mode;
 209 } CSIEscape;
 210
 211 /* STR Escape sequence structs */
 212 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 213 typedef struct {
 214         char type;             /* ESC type ... */
 215         char buf[STR_BUF_SIZ]; /* raw string */
 216         int len;               /* raw string length */
 217         char *args[STR_ARG_SIZ];
 218         int narg;              /* nb of args */
 219 } STREscape;
 220
 221 /* Internal representation of the screen */
 222 typedef struct {
 223         int row;      /* nb row */
 224         int col;      /* nb col */
 225         Line *line;   /* screen */
 226         Line *alt;    /* alternate screen */
 227         bool *dirty;  /* dirtyness of lines */
 228         TCursor c;    /* cursor */
 229         int top;      /* top    scroll limit */
 230         int bot;      /* bottom scroll limit */
 231         int mode;     /* terminal mode flags */
 232         int esc;      /* escape state flags */
 233         char trantbl[4]; /* charset table translation */
 234         int charset;  /* current charset */
 235         int icharset; /* selected charset for sequence */
 236         bool numlock; /* lock numbers in keyboard */
 237         bool *tabs;
 238 } Term;
 239
 240 /* Purely graphic info */
 241 typedef struct {
 242         Display *dpy;
 243         Colormap cmap;
 244         Window win;
 245         Drawable buf;
 246         Atom xembed, wmdeletewin, netwmname, netwmpid;
 247         XIM xim;
 248         XIC xic;
 249         Draw draw;
 250         Visual *vis;
 251         XSetWindowAttributes attrs;
 252         int scr;
 253         bool isfixed; /* is fixed geometry? */
 254         int l, t; /* left and top offset */
 255         int gm; /* geometry mask */
 256         int tw, th; /* tty width and height */
 257         int w, h; /* window width and height */
 258         int ch; /* char height */
 259         int cw; /* char width  */
 260         char state; /* focus, redraw, visible */
 261 } XWindow;
 262
 263 typedef struct {
 264         uint b;
 265         uint mask;
 266         char *s;
 267 } Mousekey;
 268
 269 typedef struct {
 270         KeySym k;
 271         uint mask;
 272         char *s;
 273         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
 274         signed char appkey;    /* application keypad */
 275         signed char appcursor; /* application cursor */
 276         signed char crlf;      /* crlf mode          */
 277 } Key;
 278
 279 typedef struct {
 280         int mode;
 281         int type;
 282         int snap;
 283         /*
 284          * Selection variables:
 285          * nb – normalized coordinates of the beginning of the selection
 286          * ne – normalized coordinates of the end of the selection
 287          * ob – original coordinates of the beginning of the selection
 288          * oe – original coordinates of the end of the selection
 289          */
 290         struct {
 291                 int x, y;
 292         } nb, ne, ob, oe;
 293
 294         char *clip;
 295         Atom xtarget;
 296         bool alt;
 297         struct timespec tclick1;
 298         struct timespec tclick2;
 299 } Selection;
 300
 301 typedef union {
 302         int i;
 303         uint ui;
 304         float f;
 305         const void *v;
 306 } Arg;
 307
 308 typedef struct {
 309         uint mod;
 310         KeySym keysym;
 311         void (*func)(const Arg *);
 312         const Arg arg;
 313 } Shortcut;
 314
 315 /* function definitions used in config.h */
 316 static void clippaste(const Arg *);
 317 static void numlock(const Arg *);
 318 static void selpaste(const Arg *);
 319 static void xzoom(const Arg *);
 320 static void printsel(const Arg *);
 321 static void printscreen(const Arg *) ;
 322 static void toggleprinter(const Arg *);
 323
 324 /* Config.h for applying patches and the configuration. */
 325 #include "config.h"
 326
 327 /* Font structure */
 328 typedef struct {
 329         int height;
 330         int width;
 331         int ascent;
 332         int descent;
 333         short lbearing;
 334         short rbearing;
 335         XftFont *match;
 336         FcFontSet *set;
 337         FcPattern *pattern;
 338 } Font;
 339
 340 /* Drawing Context */
 341 typedef struct {
 342         Color col[MAX(LEN(colorname), 256)];
 343         Font font, bfont, ifont, ibfont;
 344         GC gc;
 345 } DC;
 346
 347 static void die(const char *, ...);
 348 static void draw(void);
 349 static void redraw(int);
 350 static void drawregion(int, int, int, int);
 351 static void execsh(void);
 352 static void sigchld(int);
 353 static void run(void);
 354
 355 static void csidump(void);
 356 static void csihandle(void);
 357 static void csiparse(void);
 358 static void csireset(void);
 359 static void strdump(void);
 360 static void strhandle(void);
 361 static void strparse(void);
 362 static void strreset(void);
 363
 364 static int tattrset(int);
 365 static void tprinter(char *, size_t);
 366 static void tdumpsel(void);
 367 static void tdumpline(int);
 368 static void tdump(void);
 369 static void tclearregion(int, int, int, int);
 370 static void tcursor(int);
 371 static void tdeletechar(int);
 372 static void tdeleteline(int);
 373 static void tinsertblank(int);
 374 static void tinsertblankline(int);
 375 static int tlinelen(int);
 376 static void tmoveto(int, int);
 377 static void tmoveato(int, int);
 378 static void tnew(int, int);
 379 static void tnewline(int);
 380 static void tputtab(int);
 381 static void tputc(char *, int);
 382 static void treset(void);
 383 static void tresize(int, int);
 384 static void tscrollup(int, int);
 385 static void tscrolldown(int, int);
 386 static void tsetattr(int *, int);
 387 static void tsetchar(char *, Glyph *, int, int);
 388 static void tsetscroll(int, int);
 389 static void tswapscreen(void);
 390 static void tsetdirt(int, int);
 391 static void tsetdirtattr(int);
 392 static void tsetmode(bool, bool, int *, int);
 393 static void tfulldirt(void);
 394 static void techo(char *, int);
 395 static void tcontrolcode(uchar );
 396 static void tdectest(char );
 397 static int32_t tdefcolor(int *, int *, int);
 398 static void tdeftran(char);
 399 static inline bool match(uint, uint);
 400 static void ttynew(void);
 401 static void ttyread(void);
 402 static void ttyresize(void);
 403 static void ttysend(char *, size_t);
 404 static void ttywrite(const char *, size_t);
 405 static void tstrsequence(uchar c);
 406
 407 static void xdraws(char *, Glyph, int, int, int, int);
 408 static void xhints(void);
 409 static void xclear(int, int, int, int);
 410 static void xdrawcursor(void);
 411 static void xinit(void);
 412 static void xloadcols(void);
 413 static int xsetcolorname(int, const char *);
 414 static int xgeommasktogravity(int);
 415 static int xloadfont(Font *, FcPattern *);
 416 static void xloadfonts(char *, double);
 417 static int xloadfontset(Font *);
 418 static void xsettitle(char *);
 419 static void xresettitle(void);
 420 static void xsetpointermotion(int);
 421 static void xseturgency(int);
 422 static void xsetsel(char *);
 423 static void xtermclear(int, int, int, int);
 424 static void xunloadfont(Font *);
 425 static void xunloadfonts(void);
 426 static void xresize(int, int);
 427
 428 static void expose(XEvent *);
 429 static void visibility(XEvent *);
 430 static void unmap(XEvent *);
 431 static char *kmap(KeySym, uint);
 432 static void kpress(XEvent *);
 433 static void cmessage(XEvent *);
 434 static void cresize(int, int);
 435 static void resize(XEvent *);
 436 static void focus(XEvent *);
 437 static void brelease(XEvent *);
 438 static void bpress(XEvent *);
 439 static void bmotion(XEvent *);
 440 static void selnotify(XEvent *);
 441 static void selclear(XEvent *);
 442 static void selrequest(XEvent *);
 443
 444 static void selinit(void);
 445 static void selnormalize(void);
 446 static inline bool selected(int, int);
 447 static char *getsel(void);
 448 static void selcopy(void);
 449 static void selscroll(int, int);
 450 static void selsnap(int, int *, int *, int);
 451 static void getbuttoninfo(XEvent *);
 452 static void mousereport(XEvent *);
 453
 454 static size_t utf8decode(char *, long *, size_t);
 455 static long utf8decodebyte(char, size_t *);
 456 static size_t utf8encode(long, char *, size_t);
 457 static char utf8encodebyte(long, size_t);
 458 static size_t utf8len(char *);
 459 static size_t utf8validate(long *, size_t);
 460
 461 static ssize_t xwrite(int, const char *, size_t);
 462 static void *xmalloc(size_t);
 463 static void *xrealloc(void *, size_t);
 464 static char *xstrdup(char *);
 465
 466 static void usage(void);
 467
 468 static void (*handler[LASTEvent])(XEvent *) = {
 469         [KeyPress] = kpress,
 470         [ClientMessage] = cmessage,
 471         [ConfigureNotify] = resize,
 472         [VisibilityNotify] = visibility,
 473         [UnmapNotify] = unmap,
 474         [Expose] = expose,
 475         [FocusIn] = focus,
 476         [FocusOut] = focus,
 477         [MotionNotify] = bmotion,
 478         [ButtonPress] = bpress,
 479         [ButtonRelease] = brelease,
 480         [SelectionClear] = selclear,
 481         [SelectionNotify] = selnotify,
 482         [SelectionRequest] = selrequest,
 483 };
 484
 485 /* Globals */
 486 static DC dc;
 487 static XWindow xw;
 488 static Term term;
 489 static CSIEscape csiescseq;
 490 static STREscape strescseq;
 491 static int cmdfd;
 492 static pid_t pid;
 493 static Selection sel;
 494 static int iofd = STDOUT_FILENO;
 495 static char **opt_cmd = NULL;
 496 static char *opt_io = NULL;
 497 static char *opt_title = NULL;
 498 static char *opt_embed = NULL;
 499 static char *opt_class = NULL;
 500 static char *opt_font = NULL;
 501 static int oldbutton = 3; /* button event on startup: 3 = release */
 502
 503 static char *usedfont = NULL;
 504 static double usedfontsize = 0;
 505
 506 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
 507 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
 508 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
 509 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
 510
 511 /* Font Ring Cache */
 512 enum {
 513         FRC_NORMAL,
 514         FRC_ITALIC,
 515         FRC_BOLD,
 516         FRC_ITALICBOLD
 517 };
 518
 519 typedef struct {
 520         XftFont *font;
 521         int flags;
 522 } Fontcache;
 523
 524 /* Fontcache is an array now. A new font will be appended to the array. */
 525 static Fontcache frc[16];
 526 static int frclen = 0;
 527
 528 ssize_t
 529 xwrite(int fd, const char *s, size_t len) {
 530         size_t aux = len;
 531
 532         while(len > 0) {
 533                 ssize_t r = write(fd, s, len);
 534                 if(r < 0)
 535                         return r;
 536                 len -= r;
 537                 s += r;
 538         }
 539         return aux;
 540 }
 541
 542 void *
 543 xmalloc(size_t len) {
 544         void *p = malloc(len);
 545
 546         if(!p)
 547                 die("Out of memory\n");
 548
 549         return p;
 550 }
 551
 552 void *
 553 xrealloc(void *p, size_t len) {
 554         if((p = realloc(p, len)) == NULL)
 555                 die("Out of memory\n");
 556
 557         return p;
 558 }
 559
 560 char *
 561 xstrdup(char *s) {
 562         if((s = strdup(s)) == NULL)
 563                 die("Out of memory\n");
 564
 565         return s;
 566 }
 567
 568 size_t
 569 utf8decode(char *c, long *u, size_t clen) {
 570         size_t i, j, len, type;
 571         long udecoded;
 572
 573         *u = UTF_INVALID;
 574         if(!clen)
 575                 return 0;
 576         udecoded = utf8decodebyte(c[0], &len);
 577         if(!BETWEEN(len, 1, UTF_SIZ))
 578                 return 1;
 579         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
 580                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
 581                 if(type != 0)
 582                         return j;
 583         }
 584         if(j < len)
 585                 return 0;
 586         *u = udecoded;
 587         utf8validate(u, len);
 588         return len;
 589 }
 590
 591 long
 592 utf8decodebyte(char c, size_t *i) {
 593         for(*i = 0; *i < LEN(utfmask); ++(*i))
 594                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
 595                         return (uchar)c & ~utfmask[*i];
 596         return 0;
 597 }
 598
 599 size_t
 600 utf8encode(long u, char *c, size_t clen) {
 601         size_t len, i;
 602
 603         len = utf8validate(&u, 0);
 604         if(clen < len)
 605                 return 0;
 606         for(i = len - 1; i != 0; --i) {
 607                 c[i] = utf8encodebyte(u, 0);
 608                 u >>= 6;
 609         }
 610         c[0] = utf8encodebyte(u, len);
 611         return len;
 612 }
 613
 614 char
 615 utf8encodebyte(long u, size_t i) {
 616         return utfbyte[i] | (u & ~utfmask[i]);
 617 }
 618
 619 size_t
 620 utf8len(char *c) {
 621         return utf8decode(c, &(long){0}, UTF_SIZ);
 622 }
 623
 624 size_t
 625 utf8validate(long *u, size_t i) {
 626         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
 627                 *u = UTF_INVALID;
 628         for(i = 1; *u > utfmax[i]; ++i)
 629                 ;
 630         return i;
 631 }
 632
 633 static void
 634 selinit(void) {
 635         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 636         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 637         sel.mode = 0;
 638         sel.ob.x = -1;
 639         sel.clip = NULL;
 640         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 641         if(sel.xtarget == None)
 642                 sel.xtarget = XA_STRING;
 643 }
 644
 645 static int
 646 x2col(int x) {
 647         x -= borderpx;
 648         x /= xw.cw;
 649
 650         return LIMIT(x, 0, term.col-1);
 651 }
 652
 653 static int
 654 y2row(int y) {
 655         y -= borderpx;
 656         y /= xw.ch;
 657
 658         return LIMIT(y, 0, term.row-1);
 659 }
 660
 661 static int tlinelen(int y) {
 662         int i = term.col;
 663
 664         while (i > 0 && term.line[y][i - 1].c[0] == ' ')
 665                 --i;
 666
 667         return i;
 668 }
 669
 670 static void
 671 selnormalize(void) {
 672         int i;
 673
 674         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
 675                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
 676                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
 677         } else {
 678                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
 679                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
 680         }
 681         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
 682         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
 683
 684         /* expand selection over line breaks */
 685         if (sel.type == SEL_RECTANGULAR)
 686                 return;
 687         i = tlinelen(sel.nb.y);
 688         if (i < sel.nb.x)
 689                 sel.nb.x = i;
 690         if (tlinelen(sel.ne.y) <= sel.ne.x)
 691                 sel.ne.x = term.col - 1;
 692 }
 693
 694 static inline bool
 695 selected(int x, int y) {
 696         if(sel.type == SEL_RECTANGULAR)
 697                 return BETWEEN(y, sel.nb.y, sel.ne.y)
 698                     && BETWEEN(x, sel.nb.x, sel.ne.x);
 699
 700         return BETWEEN(y, sel.nb.y, sel.ne.y)
 701             && (y != sel.nb.y || x >= sel.nb.x)
 702             && (y != sel.ne.y || x <= sel.ne.x);
 703 }
 704
 705 void
 706 selsnap(int mode, int *x, int *y, int direction) {
 707         int newx, newy, xt, yt;
 708         Glyph *gp;
 709
 710         switch(mode) {
 711         case SNAP_WORD:
 712                 /*
 713                  * Snap around if the word wraps around at the end or
 714                  * beginning of a line.
 715                  */
 716                 for(;;) {
 717                         newx = *x + direction;
 718                         newy = *y;
 719                         if(!BETWEEN(newx, 0, term.col - 1)) {
 720                                 newy += direction;
 721                                 newx = (newx + term.col) % term.col;
 722                                 if (!BETWEEN(newy, 0, term.row - 1))
 723                                         break;
 724
 725                                 if(direction > 0)
 726                                         yt = *y, xt = *x;
 727                                 else
 728                                         yt = newy, xt = newx;
 729                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
 730                                         break;
 731                         }
 732
 733                         if (newx >= tlinelen(newy))
 734                                 break;
 735
 736                         gp = &term.line[newy][newx];
 737                         if (!(gp->mode & ATTR_WDUMMY) && strchr(worddelimiters, gp->c[0]))
 738                                 break;
 739
 740                         *x = newx;
 741                         *y = newy;
 742                 }
 743                 break;
 744         case SNAP_LINE:
 745                 /*
 746                  * Snap around if the the previous line or the current one
 747                  * has set ATTR_WRAP at its end. Then the whole next or
 748                  * previous line will be selected.
 749                  */
 750                 *x = (direction < 0) ? 0 : term.col - 1;
 751                 if(direction < 0 && *y > 0) {
 752                         for(; *y > 0; *y += direction) {
 753                                 if(!(term.line[*y-1][term.col-1].mode
 754                                                 & ATTR_WRAP)) {
 755                                         break;
 756                                 }
 757                         }
 758                 } else if(direction > 0 && *y < term.row-1) {
 759                         for(; *y < term.row; *y += direction) {
 760                                 if(!(term.line[*y][term.col-1].mode
 761                                                 & ATTR_WRAP)) {
 762                                         break;
 763                                 }
 764                         }
 765                 }
 766                 break;
 767         }
 768 }
 769
 770 void
 771 getbuttoninfo(XEvent *e) {
 772         int type;
 773         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
 774
 775         sel.alt = IS_SET(MODE_ALTSCREEN);
 776
 777         sel.oe.x = x2col(e->xbutton.x);
 778         sel.oe.y = y2row(e->xbutton.y);
 779
 780         if(sel.ob.y < sel.oe.y
 781                         || (sel.ob.y == sel.oe.y && sel.ob.x < sel.oe.x)) {
 782                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 783                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 784         } else {
 785                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, -1);
 786                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, +1);
 787         }
 788         selnormalize();
 789
 790         sel.type = SEL_REGULAR;
 791         for(type = 1; type < LEN(selmasks); ++type) {
 792                 if(match(selmasks[type], state)) {
 793                         sel.type = type;
 794                         break;
 795                 }
 796         }
 797 }
 798
 799 void
 800 mousereport(XEvent *e) {
 801         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
 802             button = e->xbutton.button, state = e->xbutton.state,
 803             len;
 804         char buf[40];
 805         static int ox, oy;
 806
 807         /* from urxvt */
 808         if(e->xbutton.type == MotionNotify) {
 809                 if(x == ox && y == oy)
 810                         return;
 811                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
 812                         return;
 813                 /* MOUSE_MOTION: no reporting if no button is pressed */
 814                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
 815                         return;
 816
 817                 button = oldbutton + 32;
 818                 ox = x;
 819                 oy = y;
 820         } else {
 821                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
 822                         button = 3;
 823                 } else {
 824                         button -= Button1;
 825                         if(button >= 3)
 826                                 button += 64 - 3;
 827                 }
 828                 if(e->xbutton.type == ButtonPress) {
 829                         oldbutton = button;
 830                         ox = x;
 831                         oy = y;
 832                 } else if(e->xbutton.type == ButtonRelease) {
 833                         oldbutton = 3;
 834                         /* MODE_MOUSEX10: no button release reporting */
 835                         if(IS_SET(MODE_MOUSEX10))
 836                                 return;
 837                         if (button == 64 || button == 65)
 838                                 return;
 839                 }
 840         }
 841
 842         if(!IS_SET(MODE_MOUSEX10)) {
 843                 button += (state & ShiftMask   ? 4  : 0)
 844                         + (state & Mod4Mask    ? 8  : 0)
 845                         + (state & ControlMask ? 16 : 0);
 846         }
 847
 848         len = 0;
 849         if(IS_SET(MODE_MOUSESGR)) {
 850                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
 851                                 button, x+1, y+1,
 852                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
 853         } else if(x < 223 && y < 223) {
 854                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
 855                                 32+button, 32+x+1, 32+y+1);
 856         } else {
 857                 return;
 858         }
 859
 860         ttywrite(buf, len);
 861 }
 862
 863 void
 864 bpress(XEvent *e) {
 865         struct timespec now;
 866         Mousekey *mk;
 867
 868         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
 869                 mousereport(e);
 870                 return;
 871         }
 872
 873         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
 874                 if(e->xbutton.button == mk->b
 875                                 && match(mk->mask, e->xbutton.state)) {
 876                         ttysend(mk->s, strlen(mk->s));
 877                         return;
 878                 }
 879         }
 880
 881         if(e->xbutton.button == Button1) {
 882                 clock_gettime(CLOCK_MONOTONIC, &now);
 883
 884                 /* Clear previous selection, logically and visually. */
 885                 selclear(NULL);
 886                 sel.mode = 1;
 887                 sel.type = SEL_REGULAR;
 888                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
 889                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
 890
 891                 /*
 892                  * If the user clicks below predefined timeouts specific
 893                  * snapping behaviour is exposed.
 894                  */
 895                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 896                         sel.snap = SNAP_LINE;
 897                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 898                         sel.snap = SNAP_WORD;
 899                 } else {
 900                         sel.snap = 0;
 901                 }
 902                 selsnap(sel.snap, &sel.ob.x, &sel.ob.y, -1);
 903                 selsnap(sel.snap, &sel.oe.x, &sel.oe.y, +1);
 904                 selnormalize();
 905
 906                 /*
 907                  * Draw selection, unless it's regular and we don't want to
 908                  * make clicks visible
 909                  */
 910                 if(sel.snap != 0) {
 911                         sel.mode++;
 912                         tsetdirt(sel.nb.y, sel.ne.y);
 913                 }
 914                 sel.tclick2 = sel.tclick1;
 915                 sel.tclick1 = now;
 916         }
 917 }
 918
 919 char *
 920 getsel(void) {
 921         char *str, *ptr;
 922         int y, bufsize, size, lastx, linelen;
 923         Glyph *gp, *last;
 924
 925         if(sel.ob.x == -1)
 926                 return NULL;
 927
 928         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
 929         ptr = str = xmalloc(bufsize);
 930
 931         /* append every set & selected glyph to the selection */
 932         for(y = sel.nb.y; y < sel.ne.y + 1; y++) {
 933                 linelen = tlinelen(y);
 934
 935                 if(sel.type == SEL_RECTANGULAR) {
 936                         gp = &term.line[y][sel.nb.x];
 937                         lastx = sel.ne.x;
 938                 } else {
 939                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
 940                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
 941                 }
 942                 last = &term.line[y][MIN(lastx, linelen-1)];
 943
 944                 for( ; gp <= last; ++gp) {
 945                         if(gp->mode & ATTR_WDUMMY)
 946                                 continue;
 947
 948                         size = utf8len(gp->c);
 949                         memcpy(ptr, gp->c, size);
 950                         ptr += size;
 951                 }
 952
 953                 /*
 954                  * Copy and pasting of line endings is inconsistent
 955                  * in the inconsistent terminal and GUI world.
 956                  * The best solution seems like to produce '\n' when
 957                  * something is copied from st and convert '\n' to
 958                  * '\r', when something to be pasted is received by
 959                  * st.
 960                  * FIXME: Fix the computer world.
 961                  */
 962                 if(sel.ne.y > y || lastx >= linelen)
 963                         *ptr++ = '\n';
 964         }
 965         *ptr = 0;
 966         return str;
 967 }
 968
 969 void
 970 selcopy(void) {
 971         xsetsel(getsel());
 972 }
 973
 974 void
 975 selnotify(XEvent *e) {
 976         ulong nitems, ofs, rem;
 977         int format;
 978         uchar *data, *last, *repl;
 979         Atom type;
 980
 981         ofs = 0;
 982         do {
 983                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 984                                         False, AnyPropertyType, &type, &format,
 985                                         &nitems, &rem, &data)) {
 986                         fprintf(stderr, "Clipboard allocation failed\n");
 987                         return;
 988                 }
 989
 990                 /*
 991                  * As seen in getsel:
 992                  * Line endings are inconsistent in the terminal and GUI world
 993                  * copy and pasting. When receiving some selection data,
 994                  * replace all '\n' with '\r'.
 995                  * FIXME: Fix the computer world.
 996                  */
 997                 repl = data;
 998                 last = data + nitems * format / 8;
 999                 while((repl = memchr(repl, '\n', last - repl))) {
1000                         *repl++ = '\r';
1001                 }
1002
1003                 if(IS_SET(MODE_BRCKTPASTE))
1004                         ttywrite("\033[200~", 6);
1005                 ttysend((char *)data, nitems * format / 8);
1006                 if(IS_SET(MODE_BRCKTPASTE))
1007                         ttywrite("\033[201~", 6);
1008                 XFree(data);
1009                 /* number of 32-bit chunks returned */
1010                 ofs += nitems * format / 32;
1011         } while(rem > 0);
1012 }
1013
1014 void
1015 selpaste(const Arg *dummy) {
1016         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1017                         xw.win, CurrentTime);
1018 }
1019
1020 void
1021 clippaste(const Arg *dummy) {
1022         Atom clipboard;
1023
1024         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1025         XConvertSelection(xw.dpy, clipboard, sel.xtarget, XA_PRIMARY,
1026                         xw.win, CurrentTime);
1027 }
1028
1029 void
1030 selclear(XEvent *e) {
1031         if(sel.ob.x == -1)
1032                 return;
1033         sel.ob.x = -1;
1034         tsetdirt(sel.nb.y, sel.ne.y);
1035 }
1036
1037 void
1038 selrequest(XEvent *e) {
1039         XSelectionRequestEvent *xsre;
1040         XSelectionEvent xev;
1041         Atom xa_targets, string;
1042
1043         xsre = (XSelectionRequestEvent *) e;
1044         xev.type = SelectionNotify;
1045         xev.requestor = xsre->requestor;
1046         xev.selection = xsre->selection;
1047         xev.target = xsre->target;
1048         xev.time = xsre->time;
1049         /* reject */
1050         xev.property = None;
1051
1052         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1053         if(xsre->target == xa_targets) {
1054                 /* respond with the supported type */
1055                 string = sel.xtarget;
1056                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1057                                 XA_ATOM, 32, PropModeReplace,
1058                                 (uchar *) &string, 1);
1059                 xev.property = xsre->property;
1060         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
1061                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1062                                 xsre->target, 8, PropModeReplace,
1063                                 (uchar *) sel.clip, strlen(sel.clip));
1064                 xev.property = xsre->property;
1065         }
1066
1067         /* all done, send a notification to the listener */
1068         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1069                 fprintf(stderr, "Error sending SelectionNotify event\n");
1070 }
1071
1072 void
1073 xsetsel(char *str) {
1074         /* register the selection for both the clipboard and the primary */
1075         Atom clipboard;
1076
1077         free(sel.clip);
1078         sel.clip = str;
1079
1080         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
1081
1082         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1083         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1084 }
1085
1086 void
1087 brelease(XEvent *e) {
1088         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1089                 mousereport(e);
1090                 return;
1091         }
1092
1093         if(e->xbutton.button == Button2) {
1094                 selpaste(NULL);
1095         } else if(e->xbutton.button == Button1) {
1096                 if(sel.mode < 2) {
1097                         selclear(NULL);
1098                 } else {
1099                         getbuttoninfo(e);
1100                         selcopy();
1101                 }
1102                 sel.mode = 0;
1103                 tsetdirt(sel.nb.y, sel.ne.y);
1104         }
1105 }
1106
1107 void
1108 bmotion(XEvent *e) {
1109         int oldey, oldex, oldsby, oldsey;
1110
1111         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1112                 mousereport(e);
1113                 return;
1114         }
1115
1116         if(!sel.mode)
1117                 return;
1118
1119         sel.mode++;
1120         oldey = sel.oe.y;
1121         oldex = sel.oe.x;
1122         oldsby = sel.nb.y;
1123         oldsey = sel.ne.y;
1124         getbuttoninfo(e);
1125
1126         if(oldey != sel.oe.y || oldex != sel.oe.x)
1127                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1128 }
1129
1130 void
1131 die(const char *errstr, ...) {
1132         va_list ap;
1133
1134         va_start(ap, errstr);
1135         vfprintf(stderr, errstr, ap);
1136         va_end(ap);
1137         exit(EXIT_FAILURE);
1138 }
1139
1140 void
1141 execsh(void) {
1142         char **args, *sh;
1143         const struct passwd *pw;
1144         char buf[sizeof(long) * 8 + 1];
1145
1146         errno = 0;
1147         if((pw = getpwuid(getuid())) == NULL) {
1148                 if(errno)
1149                         die("getpwuid:%s\n", strerror(errno));
1150                 else
1151                         die("who are you?\n");
1152         }
1153         unsetenv("COLUMNS");
1154         unsetenv("LINES");
1155         unsetenv("TERMCAP");
1156
1157         sh = (pw->pw_shell[0]) ? pw->pw_shell : shell;
1158         snprintf(buf, sizeof(buf), "%lu", xw.win);
1159
1160         setenv("LOGNAME", pw->pw_name, 1);
1161         setenv("USER", pw->pw_name, 1);
1162         setenv("SHELL", sh, 1);
1163         setenv("HOME", pw->pw_dir, 1);
1164         setenv("TERM", termname, 1);
1165         setenv("WINDOWID", buf, 1);
1166
1167         signal(SIGCHLD, SIG_DFL);
1168         signal(SIGHUP, SIG_DFL);
1169         signal(SIGINT, SIG_DFL);
1170         signal(SIGQUIT, SIG_DFL);
1171         signal(SIGTERM, SIG_DFL);
1172         signal(SIGALRM, SIG_DFL);
1173
1174         args = opt_cmd ? opt_cmd : (char *[]){sh, "-i", NULL};
1175         execvp(args[0], args);
1176         exit(EXIT_FAILURE);
1177 }
1178
1179 void
1180 sigchld(int a) {
1181         int stat, ret;
1182
1183         if(waitpid(pid, &stat, 0) < 0)
1184                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1185
1186         ret = WIFEXITED(stat) ? WEXITSTATUS(stat) : EXIT_FAILURE;
1187         if (ret != EXIT_SUCCESS)
1188                 die("child finished with error '%d'\n", stat);
1189         exit(EXIT_SUCCESS);
1190 }
1191
1192 void
1193 ttynew(void) {
1194         int m, s;
1195         struct winsize w = {term.row, term.col, 0, 0};
1196
1197         /* seems to work fine on linux, openbsd and freebsd */
1198         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1199                 die("openpty failed: %s\n", strerror(errno));
1200
1201         switch(pid = fork()) {
1202         case -1:
1203                 die("fork failed\n");
1204                 break;
1205         case 0:
1206                 setsid(); /* create a new process group */
1207                 dup2(s, STDIN_FILENO);
1208                 dup2(s, STDOUT_FILENO);
1209                 dup2(s, STDERR_FILENO);
1210                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1211                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1212                 close(s);
1213                 close(m);
1214                 execsh();
1215                 break;
1216         default:
1217                 close(s);
1218                 cmdfd = m;
1219                 signal(SIGCHLD, sigchld);
1220                 if(opt_io) {
1221                         term.mode |= MODE_PRINT;
1222                         iofd = (!strcmp(opt_io, "-")) ?
1223                                   STDOUT_FILENO :
1224                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
1225                         if(iofd < 0) {
1226                                 fprintf(stderr, "Error opening %s:%s\n",
1227                                         opt_io, strerror(errno));
1228                         }
1229                 }
1230                 break;
1231         }
1232 }
1233
1234 void
1235 ttyread(void) {
1236         static char buf[BUFSIZ];
1237         static int buflen = 0;
1238         char *ptr;
1239         char s[UTF_SIZ];
1240         int charsize; /* size of utf8 char in bytes */
1241         long unicodep;
1242         int ret;
1243
1244         /* append read bytes to unprocessed bytes */
1245         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1246                 die("Couldn't read from shell: %s\n", strerror(errno));
1247
1248         /* process every complete utf8 char */
1249         buflen += ret;
1250         ptr = buf;
1251         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1252                 utf8encode(unicodep, s, UTF_SIZ);
1253                 tputc(s, charsize);
1254                 ptr += charsize;
1255                 buflen -= charsize;
1256         }
1257
1258         /* keep any uncomplete utf8 char for the next call */
1259         memmove(buf, ptr, buflen);
1260 }
1261
1262 void
1263 ttywrite(const char *s, size_t n) {
1264         if(xwrite(cmdfd, s, n) == -1)
1265                 die("write error on tty: %s\n", strerror(errno));
1266 }
1267
1268 void
1269 ttysend(char *s, size_t n) {
1270         ttywrite(s, n);
1271         if(IS_SET(MODE_ECHO))
1272                 techo(s, n);
1273 }
1274
1275 void
1276 ttyresize(void) {
1277         struct winsize w;
1278
1279         w.ws_row = term.row;
1280         w.ws_col = term.col;
1281         w.ws_xpixel = xw.tw;
1282         w.ws_ypixel = xw.th;
1283         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1284                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1285 }
1286
1287 int
1288 tattrset(int attr) {
1289         int i, j;
1290
1291         for(i = 0; i < term.row-1; i++) {
1292                 for(j = 0; j < term.col-1; j++) {
1293                         if(term.line[i][j].mode & attr)
1294                                 return 1;
1295                 }
1296         }
1297
1298         return 0;
1299 }
1300
1301 void
1302 tsetdirt(int top, int bot) {
1303         int i;
1304
1305         LIMIT(top, 0, term.row-1);
1306         LIMIT(bot, 0, term.row-1);
1307
1308         for(i = top; i <= bot; i++)
1309                 term.dirty[i] = 1;
1310 }
1311
1312 void
1313 tsetdirtattr(int attr) {
1314         int i, j;
1315
1316         for(i = 0; i < term.row-1; i++) {
1317                 for(j = 0; j < term.col-1; j++) {
1318                         if(term.line[i][j].mode & attr) {
1319                                 tsetdirt(i, i);
1320                                 break;
1321                         }
1322                 }
1323         }
1324 }
1325
1326 void
1327 tfulldirt(void) {
1328         tsetdirt(0, term.row-1);
1329 }
1330
1331 void
1332 tcursor(int mode) {
1333         static TCursor c[2];
1334         bool alt = IS_SET(MODE_ALTSCREEN);
1335
1336         if(mode == CURSOR_SAVE) {
1337                 c[alt] = term.c;
1338         } else if(mode == CURSOR_LOAD) {
1339                 term.c = c[alt];
1340                 tmoveto(c[alt].x, c[alt].y);
1341         }
1342 }
1343
1344 void
1345 treset(void) {
1346         uint i;
1347
1348         term.c = (TCursor){{
1349                 .mode = ATTR_NULL,
1350                 .fg = defaultfg,
1351                 .bg = defaultbg
1352         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1353
1354         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1355         for(i = tabspaces; i < term.col; i += tabspaces)
1356                 term.tabs[i] = 1;
1357         term.top = 0;
1358         term.bot = term.row - 1;
1359         term.mode = MODE_WRAP;
1360         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1361         term.charset = 0;
1362
1363         for(i = 0; i < 2; i++) {
1364                 tmoveto(0, 0);
1365                 tcursor(CURSOR_SAVE);
1366                 tclearregion(0, 0, term.col-1, term.row-1);
1367                 tswapscreen();
1368         }
1369 }
1370
1371 void
1372 tnew(int col, int row) {
1373         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1374         tresize(col, row);
1375         term.numlock = 1;
1376
1377         treset();
1378 }
1379
1380 void
1381 tswapscreen(void) {
1382         Line *tmp = term.line;
1383
1384         term.line = term.alt;
1385         term.alt = tmp;
1386         term.mode ^= MODE_ALTSCREEN;
1387         tfulldirt();
1388 }
1389
1390 void
1391 tscrolldown(int orig, int n) {
1392         int i;
1393         Line temp;
1394
1395         LIMIT(n, 0, term.bot-orig+1);
1396
1397         tsetdirt(orig, term.bot-n);
1398         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1399
1400         for(i = term.bot; i >= orig+n; i--) {
1401                 temp = term.line[i];
1402                 term.line[i] = term.line[i-n];
1403                 term.line[i-n] = temp;
1404         }
1405
1406         selscroll(orig, n);
1407 }
1408
1409 void
1410 tscrollup(int orig, int n) {
1411         int i;
1412         Line temp;
1413
1414         LIMIT(n, 0, term.bot-orig+1);
1415
1416         tclearregion(0, orig, term.col-1, orig+n-1);
1417         tsetdirt(orig+n, term.bot);
1418
1419         for(i = orig; i <= term.bot-n; i++) {
1420                 temp = term.line[i];
1421                 term.line[i] = term.line[i+n];
1422                 term.line[i+n] = temp;
1423         }
1424
1425         selscroll(orig, -n);
1426 }
1427
1428 void
1429 selscroll(int orig, int n) {
1430         if(sel.ob.x == -1)
1431                 return;
1432
1433         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1434                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1435                         selclear(NULL);
1436                         return;
1437                 }
1438                 if(sel.type == SEL_RECTANGULAR) {
1439                         if(sel.ob.y < term.top)
1440                                 sel.ob.y = term.top;
1441                         if(sel.oe.y > term.bot)
1442                                 sel.oe.y = term.bot;
1443                 } else {
1444                         if(sel.ob.y < term.top) {
1445                                 sel.ob.y = term.top;
1446                                 sel.ob.x = 0;
1447                         }
1448                         if(sel.oe.y > term.bot) {
1449                                 sel.oe.y = term.bot;
1450                                 sel.oe.x = term.col;
1451                         }
1452                 }
1453                 selnormalize();
1454         }
1455 }
1456
1457 void
1458 tnewline(int first_col) {
1459         int y = term.c.y;
1460
1461         if(y == term.bot) {
1462                 tscrollup(term.top, 1);
1463         } else {
1464                 y++;
1465         }
1466         tmoveto(first_col ? 0 : term.c.x, y);
1467 }
1468
1469 void
1470 csiparse(void) {
1471         char *p = csiescseq.buf, *np;
1472         long int v;
1473
1474         csiescseq.narg = 0;
1475         if(*p == '?') {
1476                 csiescseq.priv = 1;
1477                 p++;
1478         }
1479
1480         csiescseq.buf[csiescseq.len] = '\0';
1481         while(p < csiescseq.buf+csiescseq.len) {
1482                 np = NULL;
1483                 v = strtol(p, &np, 10);
1484                 if(np == p)
1485                         v = 0;
1486                 if(v == LONG_MAX || v == LONG_MIN)
1487                         v = -1;
1488                 csiescseq.arg[csiescseq.narg++] = v;
1489                 p = np;
1490                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1491                         break;
1492                 p++;
1493         }
1494         csiescseq.mode = *p;
1495 }
1496
1497 /* for absolute user moves, when decom is set */
1498 void
1499 tmoveato(int x, int y) {
1500         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1501 }
1502
1503 void
1504 tmoveto(int x, int y) {
1505         int miny, maxy;
1506
1507         if(term.c.state & CURSOR_ORIGIN) {
1508                 miny = term.top;
1509                 maxy = term.bot;
1510         } else {
1511                 miny = 0;
1512                 maxy = term.row - 1;
1513         }
1514         LIMIT(x, 0, term.col-1);
1515         LIMIT(y, miny, maxy);
1516         term.c.state &= ~CURSOR_WRAPNEXT;
1517         term.c.x = x;
1518         term.c.y = y;
1519 }
1520
1521 void
1522 tsetchar(char *c, Glyph *attr, int x, int y) {
1523         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1524                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1525                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1526                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1527                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1528                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1529                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1530                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1531                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1532         };
1533
1534         /*
1535          * The table is proudly stolen from rxvt.
1536          */
1537         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1538                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1539                         c = vt100_0[c[0] - 0x41];
1540                 }
1541         }
1542
1543         if(term.line[y][x].mode & ATTR_WIDE) {
1544                 if(x+1 < term.col) {
1545                         term.line[y][x+1].c[0] = ' ';
1546                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1547                 }
1548         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1549                 term.line[y][x-1].c[0] = ' ';
1550                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1551         }
1552
1553         term.dirty[y] = 1;
1554         term.line[y][x] = *attr;
1555         memcpy(term.line[y][x].c, c, UTF_SIZ);
1556 }
1557
1558 void
1559 tclearregion(int x1, int y1, int x2, int y2) {
1560         int x, y, temp;
1561         Glyph *gp;
1562
1563         if(x1 > x2)
1564                 temp = x1, x1 = x2, x2 = temp;
1565         if(y1 > y2)
1566                 temp = y1, y1 = y2, y2 = temp;
1567
1568         LIMIT(x1, 0, term.col-1);
1569         LIMIT(x2, 0, term.col-1);
1570         LIMIT(y1, 0, term.row-1);
1571         LIMIT(y2, 0, term.row-1);
1572
1573         for(y = y1; y <= y2; y++) {
1574                 term.dirty[y] = 1;
1575                 for(x = x1; x <= x2; x++) {
1576                         gp = &term.line[y][x];
1577                         if(selected(x, y))
1578                                 selclear(NULL);
1579                         gp->fg = term.c.attr.fg;
1580                         gp->bg = term.c.attr.bg;
1581                         gp->mode = 0;
1582                         memcpy(gp->c, " ", 2);
1583                 }
1584         }
1585 }
1586
1587 void
1588 tdeletechar(int n) {
1589         int dst, src, size;
1590         Glyph *line;
1591
1592         LIMIT(n, 0, term.col - term.c.x);
1593
1594         dst = term.c.x;
1595         src = term.c.x + n;
1596         size = term.col - src;
1597         line = term.line[term.c.y];
1598
1599         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1600         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1601 }
1602
1603 void
1604 tinsertblank(int n) {
1605         int dst, src, size;
1606         Glyph *line;
1607
1608         LIMIT(n, 0, term.col - term.c.x);
1609
1610         dst = term.c.x + n;
1611         src = term.c.x;
1612         size = term.col - dst;
1613         line = term.line[term.c.y];
1614
1615         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1616         tclearregion(src, term.c.y, dst - 1, term.c.y);
1617 }
1618
1619 void
1620 tinsertblankline(int n) {
1621         if(BETWEEN(term.c.y, term.top, term.bot))
1622                 tscrolldown(term.c.y, n);
1623 }
1624
1625 void
1626 tdeleteline(int n) {
1627         if(BETWEEN(term.c.y, term.top, term.bot))
1628                 tscrollup(term.c.y, n);
1629 }
1630
1631 int32_t
1632 tdefcolor(int *attr, int *npar, int l) {
1633         int32_t idx = -1;
1634         uint r, g, b;
1635
1636         switch (attr[*npar + 1]) {
1637         case 2: /* direct color in RGB space */
1638                 if (*npar + 4 >= l) {
1639                         fprintf(stderr,
1640                                 "erresc(38): Incorrect number of parameters (%d)\n",
1641                                 *npar);
1642                         break;
1643                 }
1644                 r = attr[*npar + 2];
1645                 g = attr[*npar + 3];
1646                 b = attr[*npar + 4];
1647                 *npar += 4;
1648                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1649                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1650                                 r, g, b);
1651                 else
1652                         idx = TRUECOLOR(r, g, b);
1653                 break;
1654         case 5: /* indexed color */
1655                 if (*npar + 2 >= l) {
1656                         fprintf(stderr,
1657                                 "erresc(38): Incorrect number of parameters (%d)\n",
1658                                 *npar);
1659                         break;
1660                 }
1661                 *npar += 2;
1662                 if(!BETWEEN(attr[*npar], 0, 255))
1663                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1664                 else
1665                         idx = attr[*npar];
1666                 break;
1667         case 0: /* implemented defined (only foreground) */
1668         case 1: /* transparent */
1669         case 3: /* direct color in CMY space */
1670         case 4: /* direct color in CMYK space */
1671         default:
1672                 fprintf(stderr,
1673                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1674                 break;
1675         }
1676
1677         return idx;
1678 }
1679
1680 void
1681 tsetattr(int *attr, int l) {
1682         int i;
1683         int32_t idx;
1684
1685         for(i = 0; i < l; i++) {
1686                 switch(attr[i]) {
1687                 case 0:
1688                         term.c.attr.mode &= ~(
1689                                 ATTR_BOLD       |
1690                                 ATTR_FAINT      |
1691                                 ATTR_ITALIC     |
1692                                 ATTR_UNDERLINE  |
1693                                 ATTR_BLINK      |
1694                                 ATTR_REVERSE    |
1695                                 ATTR_INVISIBLE  |
1696                                 ATTR_STRUCK     );
1697                         term.c.attr.fg = defaultfg;
1698                         term.c.attr.bg = defaultbg;
1699                         break;
1700                 case 1:
1701                         term.c.attr.mode |= ATTR_BOLD;
1702                         break;
1703                 case 2:
1704                         term.c.attr.mode |= ATTR_FAINT;
1705                         break;
1706                 case 3:
1707                         term.c.attr.mode |= ATTR_ITALIC;
1708                         break;
1709                 case 4:
1710                         term.c.attr.mode |= ATTR_UNDERLINE;
1711                         break;
1712                 case 5: /* slow blink */
1713                         /* FALLTHROUGH */
1714                 case 6: /* rapid blink */
1715                         term.c.attr.mode |= ATTR_BLINK;
1716                         break;
1717                 case 7:
1718                         term.c.attr.mode |= ATTR_REVERSE;
1719                         break;
1720                 case 8:
1721                         term.c.attr.mode |= ATTR_INVISIBLE;
1722                         break;
1723                 case 9:
1724                         term.c.attr.mode |= ATTR_STRUCK;
1725                         break;
1726                 case 22:
1727                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1728                         break;
1729                 case 23:
1730                         term.c.attr.mode &= ~ATTR_ITALIC;
1731                         break;
1732                 case 24:
1733                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1734                         break;
1735                 case 25:
1736                         term.c.attr.mode &= ~ATTR_BLINK;
1737                         break;
1738                 case 27:
1739                         term.c.attr.mode &= ~ATTR_REVERSE;
1740                         break;
1741                 case 28:
1742                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1743                         break;
1744                 case 29:
1745                         term.c.attr.mode &= ~ATTR_STRUCK;
1746                         break;
1747                 case 38:
1748                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1749                                 term.c.attr.fg = idx;
1750                         break;
1751                 case 39:
1752                         term.c.attr.fg = defaultfg;
1753                         break;
1754                 case 48:
1755                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1756                                 term.c.attr.bg = idx;
1757                         break;
1758                 case 49:
1759                         term.c.attr.bg = defaultbg;
1760                         break;
1761                 default:
1762                         if(BETWEEN(attr[i], 30, 37)) {
1763                                 term.c.attr.fg = attr[i] - 30;
1764                         } else if(BETWEEN(attr[i], 40, 47)) {
1765                                 term.c.attr.bg = attr[i] - 40;
1766                         } else if(BETWEEN(attr[i], 90, 97)) {
1767                                 term.c.attr.fg = attr[i] - 90 + 8;
1768                         } else if(BETWEEN(attr[i], 100, 107)) {
1769                                 term.c.attr.bg = attr[i] - 100 + 8;
1770                         } else {
1771                                 fprintf(stderr,
1772                                         "erresc(default): gfx attr %d unknown\n",
1773                                         attr[i]), csidump();
1774                         }
1775                         break;
1776                 }
1777         }
1778 }
1779
1780 void
1781 tsetscroll(int t, int b) {
1782         int temp;
1783
1784         LIMIT(t, 0, term.row-1);
1785         LIMIT(b, 0, term.row-1);
1786         if(t > b) {
1787                 temp = t;
1788                 t = b;
1789                 b = temp;
1790         }
1791         term.top = t;
1792         term.bot = b;
1793 }
1794
1795 void
1796 tsetmode(bool priv, bool set, int *args, int narg) {
1797         int *lim, mode;
1798         bool alt;
1799
1800         for(lim = args + narg; args < lim; ++args) {
1801                 if(priv) {
1802                         switch(*args) {
1803                         case 1: /* DECCKM -- Cursor key */
1804                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1805                                 break;
1806                         case 5: /* DECSCNM -- Reverse video */
1807                                 mode = term.mode;
1808                                 MODBIT(term.mode, set, MODE_REVERSE);
1809                                 if(mode != term.mode)
1810                                         redraw(REDRAW_TIMEOUT);
1811                                 break;
1812                         case 6: /* DECOM -- Origin */
1813                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1814                                 tmoveato(0, 0);
1815                                 break;
1816                         case 7: /* DECAWM -- Auto wrap */
1817                                 MODBIT(term.mode, set, MODE_WRAP);
1818                                 break;
1819                         case 0:  /* Error (IGNORED) */
1820                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1821                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1822                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1823                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1824                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1825                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1826                         case 42: /* DECNRCM -- National characters (IGNORED) */
1827                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1828                                 break;
1829                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1830                                 MODBIT(term.mode, !set, MODE_HIDE);
1831                                 break;
1832                         case 9:    /* X10 mouse compatibility mode */
1833                                 xsetpointermotion(0);
1834                                 MODBIT(term.mode, 0, MODE_MOUSE);
1835                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1836                                 break;
1837                         case 1000: /* 1000: report button press */
1838                                 xsetpointermotion(0);
1839                                 MODBIT(term.mode, 0, MODE_MOUSE);
1840                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1841                                 break;
1842                         case 1002: /* 1002: report motion on button press */
1843                                 xsetpointermotion(0);
1844                                 MODBIT(term.mode, 0, MODE_MOUSE);
1845                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1846                                 break;
1847                         case 1003: /* 1003: enable all mouse motions */
1848                                 xsetpointermotion(set);
1849                                 MODBIT(term.mode, 0, MODE_MOUSE);
1850                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1851                                 break;
1852                         case 1004: /* 1004: send focus events to tty */
1853                                 MODBIT(term.mode, set, MODE_FOCUS);
1854                                 break;
1855                         case 1006: /* 1006: extended reporting mode */
1856                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1857                                 break;
1858                         case 1034:
1859                                 MODBIT(term.mode, set, MODE_8BIT);
1860                                 break;
1861                         case 1049: /* swap screen & set/restore cursor as xterm */
1862                                 if (!allowaltscreen)
1863                                         break;
1864                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1865                                 /* FALLTHROUGH */
1866                         case 47: /* swap screen */
1867                         case 1047:
1868                                 if (!allowaltscreen)
1869                                         break;
1870                                 alt = IS_SET(MODE_ALTSCREEN);
1871                                 if(alt) {
1872                                         tclearregion(0, 0, term.col-1,
1873                                                         term.row-1);
1874                                 }
1875                                 if(set ^ alt) /* set is always 1 or 0 */
1876                                         tswapscreen();
1877                                 if(*args != 1049)
1878                                         break;
1879                                 /* FALLTHROUGH */
1880                         case 1048:
1881                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1882                                 break;
1883                         case 2004: /* 2004: bracketed paste mode */
1884                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1885                                 break;
1886                         /* Not implemented mouse modes. See comments there. */
1887                         case 1001: /* mouse highlight mode; can hang the
1888                                       terminal by design when implemented. */
1889                         case 1005: /* UTF-8 mouse mode; will confuse
1890                                       applications not supporting UTF-8
1891                                       and luit. */
1892                         case 1015: /* urxvt mangled mouse mode; incompatible
1893                                       and can be mistaken for other control
1894                                       codes. */
1895                         default:
1896                                 fprintf(stderr,
1897                                         "erresc: unknown private set/reset mode %d\n",
1898                                         *args);
1899                                 break;
1900                         }
1901                 } else {
1902                         switch(*args) {
1903                         case 0:  /* Error (IGNORED) */
1904                                 break;
1905                         case 2:  /* KAM -- keyboard action */
1906                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1907                                 break;
1908                         case 4:  /* IRM -- Insertion-replacement */
1909                                 MODBIT(term.mode, set, MODE_INSERT);
1910                                 break;
1911                         case 12: /* SRM -- Send/Receive */
1912                                 MODBIT(term.mode, !set, MODE_ECHO);
1913                                 break;
1914                         case 20: /* LNM -- Linefeed/new line */
1915                                 MODBIT(term.mode, set, MODE_CRLF);
1916                                 break;
1917                         default:
1918                                 fprintf(stderr,
1919                                         "erresc: unknown set/reset mode %d\n",
1920                                         *args);
1921                                 break;
1922                         }
1923                 }
1924         }
1925 }
1926
1927 void
1928 csihandle(void) {
1929         char buf[40];
1930         int len;
1931
1932         switch(csiescseq.mode) {
1933         default:
1934         unknown:
1935                 fprintf(stderr, "erresc: unknown csi ");
1936                 csidump();
1937                 /* die(""); */
1938                 break;
1939         case '@': /* ICH -- Insert <n> blank char */
1940                 DEFAULT(csiescseq.arg[0], 1);
1941                 tinsertblank(csiescseq.arg[0]);
1942                 break;
1943         case 'A': /* CUU -- Cursor <n> Up */
1944                 DEFAULT(csiescseq.arg[0], 1);
1945                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1946                 break;
1947         case 'B': /* CUD -- Cursor <n> Down */
1948         case 'e': /* VPR --Cursor <n> Down */
1949                 DEFAULT(csiescseq.arg[0], 1);
1950                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1951                 break;
1952         case 'i': /* MC -- Media Copy */
1953                 switch(csiescseq.arg[0]) {
1954                 case 0:
1955                         tdump();
1956                         break;
1957                 case 1:
1958                         tdumpline(term.c.y);
1959                         break;
1960                 case 2:
1961                         tdumpsel();
1962                         break;
1963                 case 4:
1964                         term.mode &= ~MODE_PRINT;
1965                         break;
1966                 case 5:
1967                         term.mode |= MODE_PRINT;
1968                         break;
1969                 }
1970                 break;
1971         case 'c': /* DA -- Device Attributes */
1972                 if(csiescseq.arg[0] == 0)
1973                         ttywrite(vtiden, sizeof(vtiden) - 1);
1974                 break;
1975         case 'C': /* CUF -- Cursor <n> Forward */
1976         case 'a': /* HPR -- Cursor <n> Forward */
1977                 DEFAULT(csiescseq.arg[0], 1);
1978                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1979                 break;
1980         case 'D': /* CUB -- Cursor <n> Backward */
1981                 DEFAULT(csiescseq.arg[0], 1);
1982                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1983                 break;
1984         case 'E': /* CNL -- Cursor <n> Down and first col */
1985                 DEFAULT(csiescseq.arg[0], 1);
1986                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1987                 break;
1988         case 'F': /* CPL -- Cursor <n> Up and first col */
1989                 DEFAULT(csiescseq.arg[0], 1);
1990                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1991                 break;
1992         case 'g': /* TBC -- Tabulation clear */
1993                 switch(csiescseq.arg[0]) {
1994                 case 0: /* clear current tab stop */
1995                         term.tabs[term.c.x] = 0;
1996                         break;
1997                 case 3: /* clear all the tabs */
1998                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1999                         break;
2000                 default:
2001                         goto unknown;
2002                 }
2003                 break;
2004         case 'G': /* CHA -- Move to <col> */
2005         case '`': /* HPA */
2006                 DEFAULT(csiescseq.arg[0], 1);
2007                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2008                 break;
2009         case 'H': /* CUP -- Move to <row> <col> */
2010         case 'f': /* HVP */
2011                 DEFAULT(csiescseq.arg[0], 1);
2012                 DEFAULT(csiescseq.arg[1], 1);
2013                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2014                 break;
2015         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2016                 DEFAULT(csiescseq.arg[0], 1);
2017                 tputtab(csiescseq.arg[0]);
2018                 break;
2019         case 'J': /* ED -- Clear screen */
2020                 selclear(NULL);
2021                 switch(csiescseq.arg[0]) {
2022                 case 0: /* below */
2023                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2024                         if(term.c.y < term.row-1) {
2025                                 tclearregion(0, term.c.y+1, term.col-1,
2026                                                 term.row-1);
2027                         }
2028                         break;
2029                 case 1: /* above */
2030                         if(term.c.y > 1)
2031                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2032                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2033                         break;
2034                 case 2: /* all */
2035                         tclearregion(0, 0, term.col-1, term.row-1);
2036                         break;
2037                 default:
2038                         goto unknown;
2039                 }
2040                 break;
2041         case 'K': /* EL -- Clear line */
2042                 switch(csiescseq.arg[0]) {
2043                 case 0: /* right */
2044                         tclearregion(term.c.x, term.c.y, term.col-1,
2045                                         term.c.y);
2046                         break;
2047                 case 1: /* left */
2048                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2049                         break;
2050                 case 2: /* all */
2051                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2052                         break;
2053                 }
2054                 break;
2055         case 'S': /* SU -- Scroll <n> line up */
2056                 DEFAULT(csiescseq.arg[0], 1);
2057                 tscrollup(term.top, csiescseq.arg[0]);
2058                 break;
2059         case 'T': /* SD -- Scroll <n> line down */
2060                 DEFAULT(csiescseq.arg[0], 1);
2061                 tscrolldown(term.top, csiescseq.arg[0]);
2062                 break;
2063         case 'L': /* IL -- Insert <n> blank lines */
2064                 DEFAULT(csiescseq.arg[0], 1);
2065                 tinsertblankline(csiescseq.arg[0]);
2066                 break;
2067         case 'l': /* RM -- Reset Mode */
2068                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2069                 break;
2070         case 'M': /* DL -- Delete <n> lines */
2071                 DEFAULT(csiescseq.arg[0], 1);
2072                 tdeleteline(csiescseq.arg[0]);
2073                 break;
2074         case 'X': /* ECH -- Erase <n> char */
2075                 DEFAULT(csiescseq.arg[0], 1);
2076                 tclearregion(term.c.x, term.c.y,
2077                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2078                 break;
2079         case 'P': /* DCH -- Delete <n> char */
2080                 DEFAULT(csiescseq.arg[0], 1);
2081                 tdeletechar(csiescseq.arg[0]);
2082                 break;
2083         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2084                 DEFAULT(csiescseq.arg[0], 1);
2085                 tputtab(-csiescseq.arg[0]);
2086                 break;
2087         case 'd': /* VPA -- Move to <row> */
2088                 DEFAULT(csiescseq.arg[0], 1);
2089                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2090                 break;
2091         case 'h': /* SM -- Set terminal mode */
2092                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2093                 break;
2094         case 'm': /* SGR -- Terminal attribute (color) */
2095                 tsetattr(csiescseq.arg, csiescseq.narg);
2096                 break;
2097         case 'n': /* DSR – Device Status Report (cursor position) */
2098                 if (csiescseq.arg[0] == 6) {
2099                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2100                                         term.c.y+1, term.c.x+1);
2101                         ttywrite(buf, len);
2102                 }
2103                 break;
2104         case 'r': /* DECSTBM -- Set Scrolling Region */
2105                 if(csiescseq.priv) {
2106                         goto unknown;
2107                 } else {
2108                         DEFAULT(csiescseq.arg[0], 1);
2109                         DEFAULT(csiescseq.arg[1], term.row);
2110                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2111                         tmoveato(0, 0);
2112                 }
2113                 break;
2114         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2115                 tcursor(CURSOR_SAVE);
2116                 break;
2117         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2118                 tcursor(CURSOR_LOAD);
2119                 break;
2120         }
2121 }
2122
2123 void
2124 csidump(void) {
2125         int i;
2126         uint c;
2127
2128         printf("ESC[");
2129         for(i = 0; i < csiescseq.len; i++) {
2130                 c = csiescseq.buf[i] & 0xff;
2131                 if(isprint(c)) {
2132                         putchar(c);
2133                 } else if(c == '\n') {
2134                         printf("(\\n)");
2135                 } else if(c == '\r') {
2136                         printf("(\\r)");
2137                 } else if(c == 0x1b) {
2138                         printf("(\\e)");
2139                 } else {
2140                         printf("(%02x)", c);
2141                 }
2142         }
2143         putchar('\n');
2144 }
2145
2146 void
2147 csireset(void) {
2148         memset(&csiescseq, 0, sizeof(csiescseq));
2149 }
2150
2151 void
2152 strhandle(void) {
2153         char *p = NULL;
2154         int j, narg, par;
2155
2156         term.esc &= ~(ESC_STR_END|ESC_STR);
2157         strparse();
2158         narg = strescseq.narg;
2159         par = atoi(strescseq.args[0]);
2160
2161         switch(strescseq.type) {
2162         case ']': /* OSC -- Operating System Command */
2163                 switch(par) {
2164                 case 0:
2165                 case 1:
2166                 case 2:
2167                         if(narg > 1)
2168                                 xsettitle(strescseq.args[1]);
2169                         return;
2170                 case 4: /* color set */
2171                         if(narg < 3)
2172                                 break;
2173                         p = strescseq.args[2];
2174                         /* FALLTHROUGH */
2175                 case 104: /* color reset, here p = NULL */
2176                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2177                         if(xsetcolorname(j, p)) {
2178                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2179                         } else {
2180                                 /*
2181                                  * TODO if defaultbg color is changed, borders
2182                                  * are dirty
2183                                  */
2184                                 redraw(0);
2185                         }
2186                         return;
2187                 }
2188                 break;
2189         case 'k': /* old title set compatibility */
2190                 xsettitle(strescseq.args[0]);
2191                 return;
2192         case 'P': /* DCS -- Device Control String */
2193         case '_': /* APC -- Application Program Command */
2194         case '^': /* PM -- Privacy Message */
2195                 return;
2196         }
2197
2198         fprintf(stderr, "erresc: unknown str ");
2199         strdump();
2200 }
2201
2202 void
2203 strparse(void) {
2204         char *p = strescseq.buf;
2205
2206         strescseq.narg = 0;
2207         strescseq.buf[strescseq.len] = '\0';
2208         while(p && strescseq.narg < STR_ARG_SIZ)
2209                 strescseq.args[strescseq.narg++] = strsep(&p, ";");
2210 }
2211
2212 void
2213 strdump(void) {
2214         int i;
2215         uint c;
2216
2217         printf("ESC%c", strescseq.type);
2218         for(i = 0; i < strescseq.len; i++) {
2219                 c = strescseq.buf[i] & 0xff;
2220                 if(c == '\0') {
2221                         return;
2222                 } else if(isprint(c)) {
2223                         putchar(c);
2224                 } else if(c == '\n') {
2225                         printf("(\\n)");
2226                 } else if(c == '\r') {
2227                         printf("(\\r)");
2228                 } else if(c == 0x1b) {
2229                         printf("(\\e)");
2230                 } else {
2231                         printf("(%02x)", c);
2232                 }
2233         }
2234         printf("ESC\\\n");
2235 }
2236
2237 void
2238 strreset(void) {
2239         memset(&strescseq, 0, sizeof(strescseq));
2240 }
2241
2242 void
2243 tprinter(char *s, size_t len) {
2244         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2245                 fprintf(stderr, "Error writing in %s:%s\n",
2246                         opt_io, strerror(errno));
2247                 close(iofd);
2248                 iofd = -1;
2249         }
2250 }
2251
2252 void
2253 toggleprinter(const Arg *arg) {
2254         term.mode ^= MODE_PRINT;
2255 }
2256
2257 void
2258 printscreen(const Arg *arg) {
2259         tdump();
2260 }
2261
2262 void
2263 printsel(const Arg *arg) {
2264         tdumpsel();
2265 }
2266
2267 void
2268 tdumpsel(void) {
2269         char *ptr;
2270
2271         if((ptr = getsel())) {
2272                 tprinter(ptr, strlen(ptr));
2273                 free(ptr);
2274         }
2275 }
2276
2277 void
2278 tdumpline(int n) {
2279         Glyph *bp, *end;
2280
2281         bp = &term.line[n][0];
2282         end = &bp[MIN(tlinelen(n), term.col) - 1];
2283         if(bp != end || bp->c[0] != ' ') {
2284                 for( ;bp <= end; ++bp)
2285                         tprinter(bp->c, utf8len(bp->c));
2286         }
2287         tprinter("\n", 1);
2288 }
2289
2290 void
2291 tdump(void) {
2292         int i;
2293
2294         for(i = 0; i < term.row; ++i)
2295                 tdumpline(i);
2296 }
2297
2298 void
2299 tputtab(int n) {
2300         uint x = term.c.x;
2301
2302         if(n > 0) {
2303                 while(x < term.col && n--)
2304                         for(++x; x < term.col && !term.tabs[x]; ++x)
2305                                 /* nothing */ ;
2306         } else if(n < 0) {
2307                 while(x > 0 && n++)
2308                         for(--x; x > 0 && !term.tabs[x]; --x)
2309                                 /* nothing */ ;
2310         }
2311         tmoveto(x, term.c.y);
2312 }
2313
2314 void
2315 techo(char *buf, int len) {
2316         for(; len > 0; buf++, len--) {
2317                 char c = *buf;
2318
2319                 if(ISCONTROL((uchar) c)) { /* control code */
2320                         if(c & 0x80) {
2321                                 c &= 0x7f;
2322                                 tputc("^", 1);
2323                                 tputc("[", 1);
2324                         } else if(c != '\n' && c != '\r' && c != '\t') {
2325                                 c ^= 0x40;
2326                                 tputc("^", 1);
2327                         }
2328                         tputc(&c, 1);
2329                 } else {
2330                         break;
2331                 }
2332         }
2333         if(len)
2334                 tputc(buf, len);
2335 }
2336
2337 void
2338 tdeftran(char ascii) {
2339         static char cs[] = "0B";
2340         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2341         char *p;
2342
2343         if((p = strchr(cs, ascii)) == NULL) {
2344                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2345         } else {
2346                 term.trantbl[term.icharset] = vcs[p - cs];
2347         }
2348 }
2349
2350 void
2351 tstrsequence(uchar c) {
2352         if (c & 0x80) {
2353                 switch (c) {
2354                 case 0x90:   /* DCS -- Device Control String */
2355                         c = 'P';
2356                         break;
2357                 case 0x9f:   /* APC -- Application Program Command */
2358                         c = '_';
2359                         break;
2360                 case 0x9e:   /* PM -- Privacy Message */
2361                         c = '^';
2362                         break;
2363                 case 0x9d:   /* OSC -- Operating System Command */
2364                         c = ']';
2365                         break;
2366                 }
2367         }
2368         strreset();
2369         strescseq.type = c;
2370         term.esc |= ESC_STR;
2371         return;
2372 }
2373
2374 void
2375 tcontrolcode(uchar ascii) {
2376         static char question[UTF_SIZ] = "?";
2377
2378         switch(ascii) {
2379         case '\t':   /* HT */
2380                 tputtab(1);
2381                 return;
2382         case '\b':   /* BS */
2383                 tmoveto(term.c.x-1, term.c.y);
2384                 return;
2385         case '\r':   /* CR */
2386                 tmoveto(0, term.c.y);
2387                 return;
2388         case '\f':   /* LF */
2389         case '\v':   /* VT */
2390         case '\n':   /* LF */
2391                 /* go to first col if the mode is set */
2392                 tnewline(IS_SET(MODE_CRLF));
2393                 return;
2394         case '\a':   /* BEL */
2395                 if(term.esc & ESC_STR_END) {
2396                         /* backwards compatibility to xterm */
2397                         strhandle();
2398                 } else {
2399                         if(!(xw.state & WIN_FOCUSED))
2400                                 xseturgency(1);
2401                         if (bellvolume)
2402                                 XBell(xw.dpy, bellvolume);
2403                 }
2404                 break;
2405         case '\033': /* ESC */
2406                 csireset();
2407                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2408                 term.esc |= ESC_START;
2409                 return;
2410         case '\016': /* SO */
2411                 term.charset = 0;
2412                 return;
2413         case '\017': /* SI */
2414                 term.charset = 1;
2415                 return;
2416         case '\032': /* SUB */
2417                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2418         case '\030': /* CAN */
2419                 csireset();
2420                 break;
2421         case '\005': /* ENQ (IGNORED) */
2422         case '\000': /* NUL (IGNORED) */
2423         case '\021': /* XON (IGNORED) */
2424         case '\023': /* XOFF (IGNORED) */
2425         case 0177:   /* DEL (IGNORED) */
2426                 return;
2427         case 0x84:   /* TODO: IND */
2428                 break;
2429         case 0x85:   /* NEL -- Next line */
2430                 tnewline(1); /* always go to first col */
2431                 break;
2432         case 0x88:   /* HTS -- Horizontal tab stop */
2433                 term.tabs[term.c.x] = 1;
2434                 break;
2435         case 0x8d:   /* TODO: RI */
2436         case 0x8e:   /* TODO: SS2 */
2437         case 0x8f:   /* TODO: SS3 */
2438         case 0x98:   /* TODO: SOS */
2439                 break;
2440         case 0x9a:   /* DECID -- Identify Terminal */
2441                 ttywrite(vtiden, sizeof(vtiden) - 1);
2442                 break;
2443         case 0x9b:   /* TODO: CSI */
2444         case 0x9c:   /* TODO: ST */
2445                 break;
2446         case 0x90:   /* DCS -- Device Control String */
2447         case 0x9f:   /* APC -- Application Program Command */
2448         case 0x9e:   /* PM -- Privacy Message */
2449         case 0x9d:   /* OSC -- Operating System Command */
2450                 tstrsequence(ascii);
2451                 return;
2452         }
2453         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2454         term.esc &= ~(ESC_STR_END|ESC_STR);
2455         return;
2456 }
2457
2458 void
2459 tdectest(char c) {
2460         static char E[UTF_SIZ] = "E";
2461         int x, y;
2462
2463         if(c == '8') { /* DEC screen alignment test. */
2464                 for(x = 0; x < term.col; ++x) {
2465                         for(y = 0; y < term.row; ++y)
2466                                 tsetchar(E, &term.c.attr, x, y);
2467                 }
2468         }
2469 }
2470
2471 void
2472 tputc(char *c, int len) {
2473         uchar ascii;
2474         bool control;
2475         long unicodep;
2476         int width;
2477         Glyph *gp;
2478
2479         if(len == 1) {
2480                 width = 1;
2481                 unicodep = ascii = *c;
2482         } else {
2483                 utf8decode(c, &unicodep, UTF_SIZ);
2484                 width = wcwidth(unicodep);
2485                 control = ISCONTROLC1(unicodep);
2486                 ascii = unicodep;
2487         }
2488
2489         if(IS_SET(MODE_PRINT))
2490                 tprinter(c, len);
2491         control = ISCONTROL(unicodep);
2492
2493         /*
2494          * STR sequence must be checked before anything else
2495          * because it uses all following characters until it
2496          * receives a ESC, a SUB, a ST or any other C1 control
2497          * character.
2498          */
2499         if(term.esc & ESC_STR) {
2500                 if(width == 1 &&
2501                    (ascii == '\a' || ascii == 030 ||
2502                     ascii == 032  || ascii == 033 ||
2503                     ISCONTROLC1(unicodep))) {
2504                         term.esc &= ~(ESC_START|ESC_STR);
2505                         term.esc |= ESC_STR_END;
2506                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2507                         memmove(&strescseq.buf[strescseq.len], c, len);
2508                         strescseq.len += len;
2509                         return;
2510                 } else {
2511                 /*
2512                  * Here is a bug in terminals. If the user never sends
2513                  * some code to stop the str or esc command, then st
2514                  * will stop responding. But this is better than
2515                  * silently failing with unknown characters. At least
2516                  * then users will report back.
2517                  *
2518                  * In the case users ever get fixed, here is the code:
2519                  */
2520                 /*
2521                  * term.esc = 0;
2522                  * strhandle();
2523                  */
2524                         return;
2525                 }
2526         }
2527
2528         /*
2529          * Actions of control codes must be performed as soon they arrive
2530          * because they can be embedded inside a control sequence, and
2531          * they must not cause conflicts with sequences.
2532          */
2533         if(control) {
2534                 tcontrolcode(ascii);
2535                 /*
2536                  * control codes are not shown ever
2537                  */
2538                 return;
2539         } else if(term.esc & ESC_START) {
2540                 if(term.esc & ESC_CSI) {
2541                         csiescseq.buf[csiescseq.len++] = ascii;
2542                         if(BETWEEN(ascii, 0x40, 0x7E)
2543                                         || csiescseq.len >= \
2544                                         sizeof(csiescseq.buf)-1) {
2545                                 term.esc = 0;
2546                                 csiparse();
2547                                 csihandle();
2548                         }
2549                         return;
2550                 } else if(term.esc & ESC_ALTCHARSET) {
2551                         tdeftran(ascii);
2552                 } else if(term.esc & ESC_TEST) {
2553                         tdectest(ascii);
2554                 } else {
2555                         switch(ascii) {
2556                         case '[':
2557                                 term.esc |= ESC_CSI;
2558                                 return;
2559                         case '#':
2560                                 term.esc |= ESC_TEST;
2561                                 return;
2562                         case 'P': /* DCS -- Device Control String */
2563                         case '_': /* APC -- Application Program Command */
2564                         case '^': /* PM -- Privacy Message */
2565                         case ']': /* OSC -- Operating System Command */
2566                         case 'k': /* old title set compatibility */
2567                                 tstrsequence(ascii);
2568                                 return;
2569                         case '(': /* set primary charset G0 */
2570                         case ')': /* set secondary charset G1 */
2571                         case '*': /* set tertiary charset G2 */
2572                         case '+': /* set quaternary charset G3 */
2573                                 term.icharset = ascii - '(';
2574                                 term.esc |= ESC_ALTCHARSET;
2575                                 return;
2576                         case 'D': /* IND -- Linefeed */
2577                                 if(term.c.y == term.bot) {
2578                                         tscrollup(term.top, 1);
2579                                 } else {
2580                                         tmoveto(term.c.x, term.c.y+1);
2581                                 }
2582                                 break;
2583                         case 'E': /* NEL -- Next line */
2584                                 tnewline(1); /* always go to first col */
2585                                 break;
2586                         case 'H': /* HTS -- Horizontal tab stop */
2587                                 term.tabs[term.c.x] = 1;
2588                                 break;
2589                         case 'M': /* RI -- Reverse index */
2590                                 if(term.c.y == term.top) {
2591                                         tscrolldown(term.top, 1);
2592                                 } else {
2593                                         tmoveto(term.c.x, term.c.y-1);
2594                                 }
2595                                 break;
2596                         case 'Z': /* DECID -- Identify Terminal */
2597                                 ttywrite(vtiden, sizeof(vtiden) - 1);
2598                                 break;
2599                         case 'c': /* RIS -- Reset to inital state */
2600                                 treset();
2601                                 xresettitle();
2602                                 xloadcols();
2603                                 break;
2604                         case '=': /* DECPAM -- Application keypad */
2605                                 term.mode |= MODE_APPKEYPAD;
2606                                 break;
2607                         case '>': /* DECPNM -- Normal keypad */
2608                                 term.mode &= ~MODE_APPKEYPAD;
2609                                 break;
2610                         case '7': /* DECSC -- Save Cursor */
2611                                 tcursor(CURSOR_SAVE);
2612                                 break;
2613                         case '8': /* DECRC -- Restore Cursor */
2614                                 tcursor(CURSOR_LOAD);
2615                                 break;
2616                         case '\\': /* ST -- String Terminator */
2617                                 if(term.esc & ESC_STR_END)
2618                                         strhandle();
2619                                 break;
2620                         default:
2621                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2622                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2623                                 break;
2624                         }
2625                 }
2626                 term.esc = 0;
2627                 /*
2628                  * All characters which form part of a sequence are not
2629                  * printed
2630                  */
2631                 return;
2632         }
2633         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2634                 selclear(NULL);
2635
2636         gp = &term.line[term.c.y][term.c.x];
2637         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2638                 gp->mode |= ATTR_WRAP;
2639                 tnewline(1);
2640         }
2641
2642         if(IS_SET(MODE_INSERT) && term.c.x+1 < term.col)
2643                 memmove(gp+1, gp, (term.col - term.c.x - 1) * sizeof(Glyph));
2644
2645         if(term.c.x+width > term.col)
2646                 tnewline(1);
2647
2648         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2649
2650         if(width == 2) {
2651                 gp->mode |= ATTR_WIDE;
2652                 if(term.c.x+1 < term.col) {
2653                         gp[1].c[0] = '\0';
2654                         gp[1].mode = ATTR_WDUMMY;
2655                 }
2656         }
2657         if(term.c.x+width < term.col) {
2658                 tmoveto(term.c.x+width, term.c.y);
2659         } else {
2660                 term.c.state |= CURSOR_WRAPNEXT;
2661         }
2662 }
2663
2664 void
2665 tresize(int col, int row) {
2666         int i;
2667         int minrow = MIN(row, term.row);
2668         int mincol = MIN(col, term.col);
2669         int slide = term.c.y - row + 1;
2670         bool *bp;
2671         TCursor c;
2672
2673         if(col < 1 || row < 1) {
2674                 fprintf(stderr,
2675                         "tresize: error resizing to %dx%d\n", col, row);
2676                 return;
2677         }
2678
2679         /* free unneeded rows */
2680         i = 0;
2681         if(slide > 0) {
2682                 /*
2683                  * slide screen to keep cursor where we expect it -
2684                  * tscrollup would work here, but we can optimize to
2685                  * memmove because we're freeing the earlier lines
2686                  */
2687                 for(/* i = 0 */; i < slide; i++) {
2688                         free(term.line[i]);
2689                         free(term.alt[i]);
2690                 }
2691                 memmove(term.line, term.line + slide, row * sizeof(Line));
2692                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2693         }
2694         for(i += row; i < term.row; i++) {
2695                 free(term.line[i]);
2696                 free(term.alt[i]);
2697         }
2698
2699         /* resize to new height */
2700         term.line = xrealloc(term.line, row * sizeof(Line));
2701         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2702         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2703         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2704
2705         /* resize each row to new width, zero-pad if needed */
2706         for(i = 0; i < minrow; i++) {
2707                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2708                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2709         }
2710
2711         /* allocate any new rows */
2712         for(/* i == minrow */; i < row; i++) {
2713                 term.line[i] = xmalloc(col * sizeof(Glyph));
2714                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2715         }
2716         if(col > term.col) {
2717                 bp = term.tabs + term.col;
2718
2719                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2720                 while(--bp > term.tabs && !*bp)
2721                         /* nothing */ ;
2722                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2723                         *bp = 1;
2724         }
2725         /* update terminal size */
2726         term.col = col;
2727         term.row = row;
2728         /* reset scrolling region */
2729         tsetscroll(0, row-1);
2730         /* make use of the LIMIT in tmoveto */
2731         tmoveto(term.c.x, term.c.y);
2732         /* Clearing both screens (it makes dirty all lines) */
2733         c = term.c;
2734         for(i = 0; i < 2; i++) {
2735                 if(mincol < col && 0 < minrow) {
2736                         tclearregion(mincol, 0, col - 1, minrow - 1);
2737                 }
2738                 if(0 < col && minrow < row) {
2739                         tclearregion(0, minrow, col - 1, row - 1);
2740                 }
2741                 tswapscreen();
2742                 tcursor(CURSOR_LOAD);
2743         }
2744         term.c = c;
2745 }
2746
2747 void
2748 xresize(int col, int row) {
2749         xw.tw = MAX(1, col * xw.cw);
2750         xw.th = MAX(1, row * xw.ch);
2751
2752         XFreePixmap(xw.dpy, xw.buf);
2753         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2754                         DefaultDepth(xw.dpy, xw.scr));
2755         XftDrawChange(xw.draw, xw.buf);
2756         xclear(0, 0, xw.w, xw.h);
2757 }
2758
2759 static inline ushort
2760 sixd_to_16bit(int x) {
2761         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2762 }
2763
2764 void
2765 xloadcols(void) {
2766         int i;
2767         XRenderColor color = { .alpha = 0xffff };
2768         static bool loaded;
2769         Color *cp;
2770
2771         if(loaded) {
2772                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2773                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2774         }
2775
2776         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2777         for(i = 0; i < LEN(colorname); i++) {
2778                 if(!colorname[i])
2779                         continue;
2780                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2781                         die("Could not allocate color '%s'\n", colorname[i]);
2782                 }
2783         }
2784
2785         /* load colors [16-231] ; same colors as xterm */
2786         for(i = 16; i < 6*6*6+16; i++) {
2787                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2788                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2789                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2790                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2791                         die("Could not allocate color %d\n", i);
2792         }
2793
2794         /* load colors [232-255] ; grayscale */
2795         for(; i < 256; i++) {
2796                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2797                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2798                         die("Could not allocate color %d\n", i);
2799         }
2800         loaded = true;
2801 }
2802
2803 int
2804 xsetcolorname(int x, const char *name) {
2805         XRenderColor color = { .alpha = 0xffff };
2806         Color ncolor;
2807
2808         if(!BETWEEN(x, 0, LEN(colorname)))
2809                 return 1;
2810
2811         if(!name) {
2812                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2813                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2814                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2815                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2816                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2817                                                 xw.cmap, &color, &ncolor)) {
2818                                 return 1;
2819                         }
2820
2821                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2822                         dc.col[x] = ncolor;
2823                         return 0;
2824                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2825                         color.red = color.green = color.blue = \
2826                                     0x0808 + 0x0a0a * (x - (16 + 216));
2827                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2828                                                 xw.cmap, &color, &ncolor)) {
2829                                 return 1;
2830                         }
2831
2832                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2833                         dc.col[x] = ncolor;
2834                         return 0;
2835                 } else { /* system colors */
2836                         name = colorname[x];
2837                 }
2838         }
2839         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2840                 return 1;
2841
2842         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2843         dc.col[x] = ncolor;
2844         return 0;
2845 }
2846
2847 void
2848 xtermclear(int col1, int row1, int col2, int row2) {
2849         XftDrawRect(xw.draw,
2850                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2851                         borderpx + col1 * xw.cw,
2852                         borderpx + row1 * xw.ch,
2853                         (col2-col1+1) * xw.cw,
2854                         (row2-row1+1) * xw.ch);
2855 }
2856
2857 /*
2858  * Absolute coordinates.
2859  */
2860 void
2861 xclear(int x1, int y1, int x2, int y2) {
2862         XftDrawRect(xw.draw,
2863                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
2864                         x1, y1, x2-x1, y2-y1);
2865 }
2866
2867 void
2868 xhints(void) {
2869         XClassHint class = {opt_class ? opt_class : termname, termname};
2870         XWMHints wm = {.flags = InputHint, .input = 1};
2871         XSizeHints *sizeh = NULL;
2872
2873         sizeh = XAllocSizeHints();
2874
2875         sizeh->flags = PSize | PResizeInc | PBaseSize;
2876         sizeh->height = xw.h;
2877         sizeh->width = xw.w;
2878         sizeh->height_inc = xw.ch;
2879         sizeh->width_inc = xw.cw;
2880         sizeh->base_height = 2 * borderpx;
2881         sizeh->base_width = 2 * borderpx;
2882         if(xw.isfixed == True) {
2883                 sizeh->flags |= PMaxSize | PMinSize;
2884                 sizeh->min_width = sizeh->max_width = xw.w;
2885                 sizeh->min_height = sizeh->max_height = xw.h;
2886         }
2887         if(xw.gm & (XValue|YValue)) {
2888                 sizeh->flags |= USPosition | PWinGravity;
2889                 sizeh->x = xw.l;
2890                 sizeh->y = xw.t;
2891                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
2892         }
2893
2894         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
2895                         &class);
2896         XFree(sizeh);
2897 }
2898
2899 int
2900 xgeommasktogravity(int mask) {
2901         switch(mask & (XNegative|YNegative)) {
2902         case 0:
2903                 return NorthWestGravity;
2904         case XNegative:
2905                 return NorthEastGravity;
2906         case YNegative:
2907                 return SouthWestGravity;
2908         }
2909         return SouthEastGravity;
2910 }
2911
2912 int
2913 xloadfont(Font *f, FcPattern *pattern) {
2914         FcPattern *match;
2915         FcResult result;
2916
2917         match = FcFontMatch(NULL, pattern, &result);
2918         if(!match)
2919                 return 1;
2920
2921         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
2922                 FcPatternDestroy(match);
2923                 return 1;
2924         }
2925
2926         f->set = NULL;
2927         f->pattern = FcPatternDuplicate(pattern);
2928
2929         f->ascent = f->match->ascent;
2930         f->descent = f->match->descent;
2931         f->lbearing = 0;
2932         f->rbearing = f->match->max_advance_width;
2933
2934         f->height = f->ascent + f->descent;
2935         f->width = f->lbearing + f->rbearing;
2936
2937         return 0;
2938 }
2939
2940 void
2941 xloadfonts(char *fontstr, double fontsize) {
2942         FcPattern *pattern;
2943         FcResult r_sz, r_psz;
2944         double fontval;
2945         float ceilf(float);
2946
2947         if(fontstr[0] == '-') {
2948                 pattern = XftXlfdParse(fontstr, False, False);
2949         } else {
2950                 pattern = FcNameParse((FcChar8 *)fontstr);
2951         }
2952
2953         if(!pattern)
2954                 die("st: can't open font %s\n", fontstr);
2955
2956         if(fontsize > 0) {
2957                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2958                 FcPatternDel(pattern, FC_SIZE);
2959                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2960                 usedfontsize = fontsize;
2961         } else {
2962                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2963                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
2964                 if(r_psz == FcResultMatch) {
2965                         usedfontsize = fontval;
2966                 } else if(r_sz == FcResultMatch) {
2967                         usedfontsize = -1;
2968                 } else {
2969                         /*
2970                          * Default font size is 12, if none given. This is to
2971                          * have a known usedfontsize value.
2972                          */
2973                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2974                         usedfontsize = 12;
2975                 }
2976         }
2977
2978         FcConfigSubstitute(0, pattern, FcMatchPattern);
2979         FcDefaultSubstitute(pattern);
2980
2981         if(xloadfont(&dc.font, pattern))
2982                 die("st: can't open font %s\n", fontstr);
2983
2984         if(usedfontsize < 0) {
2985                 FcPatternGetDouble(dc.font.match->pattern,
2986                                    FC_PIXEL_SIZE, 0, &fontval);
2987                 usedfontsize = fontval;
2988         }
2989
2990         /* Setting character width and height. */
2991         xw.cw = ceilf(dc.font.width * cwscale);
2992         xw.ch = ceilf(dc.font.height * chscale);
2993
2994         FcPatternDel(pattern, FC_SLANT);
2995         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2996         if(xloadfont(&dc.ifont, pattern))
2997                 die("st: can't open font %s\n", fontstr);
2998
2999         FcPatternDel(pattern, FC_WEIGHT);
3000         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
3001         if(xloadfont(&dc.ibfont, pattern))
3002                 die("st: can't open font %s\n", fontstr);
3003
3004         FcPatternDel(pattern, FC_SLANT);
3005         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3006         if(xloadfont(&dc.bfont, pattern))
3007                 die("st: can't open font %s\n", fontstr);
3008
3009         FcPatternDestroy(pattern);
3010 }
3011
3012 int
3013 xloadfontset(Font *f) {
3014         FcResult result;
3015
3016         if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
3017                 return 1;
3018         return 0;
3019 }
3020
3021 void
3022 xunloadfont(Font *f) {
3023         XftFontClose(xw.dpy, f->match);
3024         FcPatternDestroy(f->pattern);
3025         if(f->set)
3026                 FcFontSetDestroy(f->set);
3027 }
3028
3029 void
3030 xunloadfonts(void) {
3031         /* Free the loaded fonts in the font cache.  */
3032         while(frclen > 0)
3033                 XftFontClose(xw.dpy, frc[--frclen].font);
3034
3035         xunloadfont(&dc.font);
3036         xunloadfont(&dc.bfont);
3037         xunloadfont(&dc.ifont);
3038         xunloadfont(&dc.ibfont);
3039 }
3040
3041 void
3042 xzoom(const Arg *arg) {
3043         xunloadfonts();
3044         xloadfonts(usedfont, usedfontsize + arg->i);
3045         cresize(0, 0);
3046         redraw(0);
3047         xhints();
3048 }
3049
3050 void
3051 xinit(void) {
3052         XGCValues gcvalues;
3053         Cursor cursor;
3054         Window parent;
3055         pid_t thispid = getpid();
3056
3057         if(!(xw.dpy = XOpenDisplay(NULL)))
3058                 die("Can't open display\n");
3059         xw.scr = XDefaultScreen(xw.dpy);
3060         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3061
3062         /* font */
3063         if(!FcInit())
3064                 die("Could not init fontconfig.\n");
3065
3066         usedfont = (opt_font == NULL)? font : opt_font;
3067         xloadfonts(usedfont, 0);
3068
3069         /* colors */
3070         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3071         xloadcols();
3072
3073         /* adjust fixed window geometry */
3074         xw.w = 2 * borderpx + term.col * xw.cw;
3075         xw.h = 2 * borderpx + term.row * xw.ch;
3076         if(xw.gm & XNegative)
3077                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3078         if(xw.gm & YNegative)
3079                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3080
3081         /* Events */
3082         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3083         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3084         xw.attrs.bit_gravity = NorthWestGravity;
3085         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3086                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3087                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3088         xw.attrs.colormap = xw.cmap;
3089
3090         parent = opt_embed ? strtol(opt_embed, NULL, 0) : \
3091                         XRootWindow(xw.dpy, xw.scr);
3092         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3093                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3094                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3095                         | CWEventMask | CWColormap, &xw.attrs);
3096
3097         memset(&gcvalues, 0, sizeof(gcvalues));
3098         gcvalues.graphics_exposures = False;
3099         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3100                         &gcvalues);
3101         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3102                         DefaultDepth(xw.dpy, xw.scr));
3103         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3104         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3105
3106         /* Xft rendering context */
3107         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3108
3109         /* input methods */
3110         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3111                 XSetLocaleModifiers("@im=local");
3112                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3113                         XSetLocaleModifiers("@im=");
3114                         if((xw.xim = XOpenIM(xw.dpy,
3115                                         NULL, NULL, NULL)) == NULL) {
3116                                 die("XOpenIM failed. Could not open input"
3117                                         " device.\n");
3118                         }
3119                 }
3120         }
3121         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3122                                            | XIMStatusNothing, XNClientWindow, xw.win,
3123                                            XNFocusWindow, xw.win, NULL);
3124         if(xw.xic == NULL)
3125                 die("XCreateIC failed. Could not obtain input method.\n");
3126
3127         /* white cursor, black outline */
3128         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3129         XDefineCursor(xw.dpy, xw.win, cursor);
3130         XRecolorCursor(xw.dpy, cursor,
3131                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3132                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3133
3134         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3135         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3136         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3137         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3138
3139         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3140         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3141                         PropModeReplace, (uchar *)&thispid, 1);
3142
3143         xresettitle();
3144         XMapWindow(xw.dpy, xw.win);
3145         xhints();
3146         XSync(xw.dpy, False);
3147 }
3148
3149 void
3150 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3151         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3152             width = charlen * xw.cw, xp, i;
3153         int frcflags;
3154         int u8fl, u8fblen, u8cblen, doesexist;
3155         char *u8c, *u8fs;
3156         long unicodep;
3157         Font *font = &dc.font;
3158         FcResult fcres;
3159         FcPattern *fcpattern, *fontpattern;
3160         FcFontSet *fcsets[] = { NULL };
3161         FcCharSet *fccharset;
3162         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3163         XRenderColor colfg, colbg;
3164         XRectangle r;
3165         int oneatatime;
3166
3167         frcflags = FRC_NORMAL;
3168
3169         if(base.mode & ATTR_ITALIC) {
3170                 if(base.fg == defaultfg)
3171                         base.fg = defaultitalic;
3172                 font = &dc.ifont;
3173                 frcflags = FRC_ITALIC;
3174         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3175                 if(base.fg == defaultfg)
3176                         base.fg = defaultitalic;
3177                 font = &dc.ibfont;
3178                 frcflags = FRC_ITALICBOLD;
3179         } else if(base.mode & ATTR_UNDERLINE) {
3180                 if(base.fg == defaultfg)
3181                         base.fg = defaultunderline;
3182         }
3183
3184         if(IS_TRUECOL(base.fg)) {
3185                 colfg.alpha = 0xffff;
3186                 colfg.red = TRUERED(base.fg);
3187                 colfg.green = TRUEGREEN(base.fg);
3188                 colfg.blue = TRUEBLUE(base.fg);
3189                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3190                 fg = &truefg;
3191         } else {
3192                 fg = &dc.col[base.fg];
3193         }
3194
3195         if(IS_TRUECOL(base.bg)) {
3196                 colbg.alpha = 0xffff;
3197                 colbg.green = TRUEGREEN(base.bg);
3198                 colbg.red = TRUERED(base.bg);
3199                 colbg.blue = TRUEBLUE(base.bg);
3200                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3201                 bg = &truebg;
3202         } else {
3203                 bg = &dc.col[base.bg];
3204         }
3205
3206         if(base.mode & ATTR_BOLD) {
3207                 /*
3208                  * change basic system colors [0-7]
3209                  * to bright system colors [8-15]
3210                  */
3211                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3212                         fg = &dc.col[base.fg + 8];
3213
3214                 if(base.mode & ATTR_ITALIC) {
3215                         font = &dc.ibfont;
3216                         frcflags = FRC_ITALICBOLD;
3217                 } else {
3218                         font = &dc.bfont;
3219                         frcflags = FRC_BOLD;
3220                 }
3221         }
3222
3223         if(IS_SET(MODE_REVERSE)) {
3224                 if(fg == &dc.col[defaultfg]) {
3225                         fg = &dc.col[defaultbg];
3226                 } else {
3227                         colfg.red = ~fg->color.red;
3228                         colfg.green = ~fg->color.green;
3229                         colfg.blue = ~fg->color.blue;
3230                         colfg.alpha = fg->color.alpha;
3231                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3232                                         &revfg);
3233                         fg = &revfg;
3234                 }
3235
3236                 if(bg == &dc.col[defaultbg]) {
3237                         bg = &dc.col[defaultfg];
3238                 } else {
3239                         colbg.red = ~bg->color.red;
3240                         colbg.green = ~bg->color.green;
3241                         colbg.blue = ~bg->color.blue;
3242                         colbg.alpha = bg->color.alpha;
3243                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3244                                         &revbg);
3245                         bg = &revbg;
3246                 }
3247         }
3248
3249         if(base.mode & ATTR_REVERSE) {
3250                 temp = fg;
3251                 fg = bg;
3252                 bg = temp;
3253         }
3254
3255         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3256                 colfg.red = fg->color.red / 2;
3257                 colfg.green = fg->color.green / 2;
3258                 colfg.blue = fg->color.blue / 2;
3259                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3260                 fg = &revfg;
3261         }
3262
3263         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3264                 fg = bg;
3265
3266         if(base.mode & ATTR_INVISIBLE)
3267                 fg = bg;
3268
3269         /* Intelligent cleaning up of the borders. */
3270         if(x == 0) {
3271                 xclear(0, (y == 0)? 0 : winy, borderpx,
3272                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3273         }
3274         if(x + charlen >= term.col) {
3275                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3276                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3277         }
3278         if(y == 0)
3279                 xclear(winx, 0, winx + width, borderpx);
3280         if(y == term.row-1)
3281                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3282
3283         /* Clean up the region we want to draw to. */
3284         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3285
3286         /* Set the clip region because Xft is sometimes dirty. */
3287         r.x = 0;
3288         r.y = 0;
3289         r.height = xw.ch;
3290         r.width = width;
3291         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3292
3293         for(xp = winx; bytelen > 0;) {
3294                 /*
3295                  * Search for the range in the to be printed string of glyphs
3296                  * that are in the main font. Then print that range. If
3297                  * some glyph is found that is not in the font, do the
3298                  * fallback dance.
3299                  */
3300                 u8fs = s;
3301                 u8fblen = 0;
3302                 u8fl = 0;
3303                 oneatatime = font->width != xw.cw;
3304                 for(;;) {
3305                         u8c = s;
3306                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3307                         s += u8cblen;
3308                         bytelen -= u8cblen;
3309
3310                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3311                         if(doesexist) {
3312                                         u8fl++;
3313                                         u8fblen += u8cblen;
3314                                         if(!oneatatime && bytelen > 0)
3315                                                         continue;
3316                         }
3317
3318                         if(u8fl > 0) {
3319                                 XftDrawStringUtf8(xw.draw, fg,
3320                                                 font->match, xp,
3321                                                 winy + font->ascent,
3322                                                 (FcChar8 *)u8fs,
3323                                                 u8fblen);
3324                                 xp += xw.cw * u8fl;
3325                         }
3326                         break;
3327                 }
3328                 if(doesexist) {
3329                         if(oneatatime)
3330                                 continue;
3331                         break;
3332                 }
3333
3334                 /* Search the font cache. */
3335                 for(i = 0; i < frclen; i++) {
3336                         if(XftCharExists(xw.dpy, frc[i].font, unicodep)
3337                                         && frc[i].flags == frcflags) {
3338                                 break;
3339                         }
3340                 }
3341
3342                 /* Nothing was found. */
3343                 if(i >= frclen) {
3344                         if(!font->set)
3345                                 xloadfontset(font);
3346                         fcsets[0] = font->set;
3347
3348                         /*
3349                          * Nothing was found in the cache. Now use
3350                          * some dozen of Fontconfig calls to get the
3351                          * font for one single character.
3352                          *
3353                          * Xft and fontconfig are design failures.
3354                          */
3355                         fcpattern = FcPatternDuplicate(font->pattern);
3356                         fccharset = FcCharSetCreate();
3357
3358                         FcCharSetAddChar(fccharset, unicodep);
3359                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3360                                         fccharset);
3361                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3362                                         FcTrue);
3363
3364                         FcConfigSubstitute(0, fcpattern,
3365                                         FcMatchPattern);
3366                         FcDefaultSubstitute(fcpattern);
3367
3368                         fontpattern = FcFontSetMatch(0, fcsets,
3369                                         FcTrue, fcpattern, &fcres);
3370
3371                         /*
3372                          * Overwrite or create the new cache entry.
3373                          */
3374                         if(frclen >= LEN(frc)) {
3375                                 frclen = LEN(frc) - 1;
3376                                 XftFontClose(xw.dpy, frc[frclen].font);
3377                         }
3378
3379                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3380                                         fontpattern);
3381                         frc[frclen].flags = frcflags;
3382
3383                         i = frclen;
3384                         frclen++;
3385
3386                         FcPatternDestroy(fcpattern);
3387                         FcCharSetDestroy(fccharset);
3388                 }
3389
3390                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3391                                 xp, winy + frc[i].font->ascent,
3392                                 (FcChar8 *)u8c, u8cblen);
3393
3394                 xp += xw.cw * wcwidth(unicodep);
3395         }
3396
3397         /*
3398          * This is how the loop above actually should be. Why does the
3399          * application have to care about font details?
3400          *
3401          * I have to repeat: Xft and Fontconfig are design failures.
3402          */
3403         /*
3404         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3405                         winy + font->ascent, (FcChar8 *)s, bytelen);
3406         */
3407
3408         if(base.mode & ATTR_UNDERLINE) {
3409                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3410                                 width, 1);
3411         }
3412
3413         if(base.mode & ATTR_STRUCK) {
3414                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3415                                 width, 1);
3416         }
3417
3418         /* Reset clip to none. */
3419         XftDrawSetClip(xw.draw, 0);
3420 }
3421
3422 void
3423 xdrawcursor(void) {
3424         static int oldx = 0, oldy = 0;
3425         int sl, width, curx;
3426         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3427
3428         LIMIT(oldx, 0, term.col-1);
3429         LIMIT(oldy, 0, term.row-1);
3430
3431         curx = term.c.x;
3432
3433         /* adjust position if in dummy */
3434         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3435                 oldx--;
3436         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3437                 curx--;
3438
3439         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3440
3441         /* remove the old cursor */
3442         sl = utf8len(term.line[oldy][oldx].c);
3443         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3444         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3445                         oldy, width, sl);
3446
3447         /* draw the new one */
3448         if(!(IS_SET(MODE_HIDE))) {
3449                 if(xw.state & WIN_FOCUSED) {
3450                         if(IS_SET(MODE_REVERSE)) {
3451                                 g.mode |= ATTR_REVERSE;
3452                                 g.fg = defaultcs;
3453                                 g.bg = defaultfg;
3454                         }
3455
3456                         sl = utf8len(g.c);
3457                         width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3458                                 ? 2 : 1;
3459                         xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3460                 } else {
3461                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3462                                         borderpx + curx * xw.cw,
3463                                         borderpx + term.c.y * xw.ch,
3464                                         xw.cw - 1, 1);
3465                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3466                                         borderpx + curx * xw.cw,
3467                                         borderpx + term.c.y * xw.ch,
3468                                         1, xw.ch - 1);
3469                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3470                                         borderpx + (curx + 1) * xw.cw - 1,
3471                                         borderpx + term.c.y * xw.ch,
3472                                         1, xw.ch - 1);
3473                         XftDrawRect(xw.draw, &dc.col[defaultcs],
3474                                         borderpx + curx * xw.cw,
3475                                         borderpx + (term.c.y + 1) * xw.ch - 1,
3476                                         xw.cw, 1);
3477                 }
3478                 oldx = curx, oldy = term.c.y;
3479         }
3480 }
3481
3482
3483 void
3484 xsettitle(char *p) {
3485         XTextProperty prop;
3486
3487         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3488                         &prop);
3489         XSetWMName(xw.dpy, xw.win, &prop);
3490         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3491         XFree(prop.value);
3492 }
3493
3494 void
3495 xresettitle(void) {
3496         xsettitle(opt_title ? opt_title : "st");
3497 }
3498
3499 void
3500 redraw(int timeout) {
3501         struct timespec tv = {0, timeout * 1000};
3502
3503         tfulldirt();
3504         draw();
3505
3506         if(timeout > 0) {
3507                 nanosleep(&tv, NULL);
3508                 XSync(xw.dpy, False); /* necessary for a good tput flash */
3509         }
3510 }
3511
3512 void
3513 draw(void) {
3514         drawregion(0, 0, term.col, term.row);
3515         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3516                         xw.h, 0, 0);
3517         XSetForeground(xw.dpy, dc.gc,
3518                         dc.col[IS_SET(MODE_REVERSE)?
3519                                 defaultfg : defaultbg].pixel);
3520 }
3521
3522 void
3523 drawregion(int x1, int y1, int x2, int y2) {
3524         int ic, ib, x, y, ox, sl;
3525         Glyph base, new;
3526         char buf[DRAW_BUF_SIZ];
3527         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3528         long unicodep;
3529
3530         if(!(xw.state & WIN_VISIBLE))
3531                 return;
3532
3533         for(y = y1; y < y2; y++) {
3534                 if(!term.dirty[y])
3535                         continue;
3536
3537                 xtermclear(0, y, term.col, y);
3538                 term.dirty[y] = 0;
3539                 base = term.line[y][0];
3540                 ic = ib = ox = 0;
3541                 for(x = x1; x < x2; x++) {
3542                         new = term.line[y][x];
3543                         if(new.mode == ATTR_WDUMMY)
3544                                 continue;
3545                         if(ena_sel && selected(x, y))
3546                                 new.mode ^= ATTR_REVERSE;
3547                         if(ib > 0 && (ATTRCMP(base, new)
3548                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3549                                 xdraws(buf, base, ox, y, ic, ib);
3550                                 ic = ib = 0;
3551                         }
3552                         if(ib == 0) {
3553                                 ox = x;
3554                                 base = new;
3555                         }
3556
3557                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3558                         memcpy(buf+ib, new.c, sl);
3559                         ib += sl;
3560                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3561                 }
3562                 if(ib > 0)
3563                         xdraws(buf, base, ox, y, ic, ib);
3564         }
3565         xdrawcursor();
3566 }
3567
3568 void
3569 expose(XEvent *ev) {
3570         XExposeEvent *e = &ev->xexpose;
3571
3572         if(xw.state & WIN_REDRAW) {
3573                 if(!e->count)
3574                         xw.state &= ~WIN_REDRAW;
3575         }
3576         redraw(0);
3577 }
3578
3579 void
3580 visibility(XEvent *ev) {
3581         XVisibilityEvent *e = &ev->xvisibility;
3582
3583         if(e->state == VisibilityFullyObscured) {
3584                 xw.state &= ~WIN_VISIBLE;
3585         } else if(!(xw.state & WIN_VISIBLE)) {
3586                 /* need a full redraw for next Expose, not just a buf copy */
3587                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3588         }
3589 }
3590
3591 void
3592 unmap(XEvent *ev) {
3593         xw.state &= ~WIN_VISIBLE;
3594 }
3595
3596 void
3597 xsetpointermotion(int set) {
3598         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3599         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3600 }
3601
3602 void
3603 xseturgency(int add) {
3604         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3605
3606         MODBIT(h->flags, add, XUrgencyHint);
3607         XSetWMHints(xw.dpy, xw.win, h);
3608         XFree(h);
3609 }
3610
3611 void
3612 focus(XEvent *ev) {
3613         XFocusChangeEvent *e = &ev->xfocus;
3614
3615         if(e->mode == NotifyGrab)
3616                 return;
3617
3618         if(ev->type == FocusIn) {
3619                 XSetICFocus(xw.xic);
3620                 xw.state |= WIN_FOCUSED;
3621                 xseturgency(0);
3622                 if(IS_SET(MODE_FOCUS))
3623                         ttywrite("\033[I", 3);
3624         } else {
3625                 XUnsetICFocus(xw.xic);
3626                 xw.state &= ~WIN_FOCUSED;
3627                 if(IS_SET(MODE_FOCUS))
3628                         ttywrite("\033[O", 3);
3629         }
3630 }
3631
3632 static inline bool
3633 match(uint mask, uint state) {
3634         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3635 }
3636
3637 void
3638 numlock(const Arg *dummy) {
3639         term.numlock ^= 1;
3640 }
3641
3642 char*
3643 kmap(KeySym k, uint state) {
3644         Key *kp;
3645         int i;
3646
3647         /* Check for mapped keys out of X11 function keys. */
3648         for(i = 0; i < LEN(mappedkeys); i++) {
3649                 if(mappedkeys[i] == k)
3650                         break;
3651         }
3652         if(i == LEN(mappedkeys)) {
3653                 if((k & 0xFFFF) < 0xFD00)
3654                         return NULL;
3655         }
3656
3657         for(kp = key; kp < key + LEN(key); kp++) {
3658                 if(kp->k != k)
3659                         continue;
3660
3661                 if(!match(kp->mask, state))
3662                         continue;
3663
3664                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3665                         continue;
3666                 if(term.numlock && kp->appkey == 2)
3667                         continue;
3668
3669                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3670                         continue;
3671
3672                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3673                         continue;
3674
3675                 return kp->s;
3676         }
3677
3678         return NULL;
3679 }
3680
3681 void
3682 kpress(XEvent *ev) {
3683         XKeyEvent *e = &ev->xkey;
3684         KeySym ksym;
3685         char buf[32], *customkey;
3686         int len;
3687         long c;
3688         Status status;
3689         Shortcut *bp;
3690
3691         if(IS_SET(MODE_KBDLOCK))
3692                 return;
3693
3694         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3695         /* 1. shortcuts */
3696         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3697                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3698                         bp->func(&(bp->arg));
3699                         return;
3700                 }
3701         }
3702
3703         /* 2. custom keys from config.h */
3704         if((customkey = kmap(ksym, e->state))) {
3705                 ttysend(customkey, strlen(customkey));
3706                 return;
3707         }
3708
3709         /* 3. composed string from input method */
3710         if(len == 0)
3711                 return;
3712         if(len == 1 && e->state & Mod1Mask) {
3713                 if(IS_SET(MODE_8BIT)) {
3714                         if(*buf < 0177) {
3715                                 c = *buf | 0x80;
3716                                 len = utf8encode(c, buf, UTF_SIZ);
3717                         }
3718                 } else {
3719                         buf[1] = buf[0];
3720                         buf[0] = '\033';
3721                         len = 2;
3722                 }
3723         }
3724         ttysend(buf, len);
3725 }
3726
3727
3728 void
3729 cmessage(XEvent *e) {
3730         /*
3731          * See xembed specs
3732          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3733          */
3734         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3735                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3736                         xw.state |= WIN_FOCUSED;
3737                         xseturgency(0);
3738                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3739                         xw.state &= ~WIN_FOCUSED;
3740                 }
3741         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3742                 /* Send SIGHUP to shell */
3743                 kill(pid, SIGHUP);
3744                 exit(EXIT_SUCCESS);
3745         }
3746 }
3747
3748 void
3749 cresize(int width, int height) {
3750         int col, row;
3751
3752         if(width != 0)
3753                 xw.w = width;
3754         if(height != 0)
3755                 xw.h = height;
3756
3757         col = (xw.w - 2 * borderpx) / xw.cw;
3758         row = (xw.h - 2 * borderpx) / xw.ch;
3759
3760         tresize(col, row);
3761         xresize(col, row);
3762         ttyresize();
3763 }
3764
3765 void
3766 resize(XEvent *e) {
3767         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3768                 return;
3769
3770         cresize(e->xconfigure.width, e->xconfigure.height);
3771 }
3772
3773 void
3774 run(void) {
3775         XEvent ev;
3776         int w = xw.w, h = xw.h;
3777         fd_set rfd;
3778         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3779         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3780         long deltatime;
3781
3782         /* Waiting for window mapping */
3783         while(1) {
3784                 XNextEvent(xw.dpy, &ev);
3785                 if(XFilterEvent(&ev, None))
3786                         continue;
3787                 if(ev.type == ConfigureNotify) {
3788                         w = ev.xconfigure.width;
3789                         h = ev.xconfigure.height;
3790                 } else if(ev.type == MapNotify) {
3791                         break;
3792                 }
3793         }
3794
3795         ttynew();
3796         cresize(w, h);
3797
3798         clock_gettime(CLOCK_MONOTONIC, &last);
3799         lastblink = last;
3800
3801         for(xev = actionfps;;) {
3802                 FD_ZERO(&rfd);
3803                 FD_SET(cmdfd, &rfd);
3804                 FD_SET(xfd, &rfd);
3805
3806                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3807                         if(errno == EINTR)
3808                                 continue;
3809                         die("select failed: %s\n", strerror(errno));
3810                 }
3811                 if(FD_ISSET(cmdfd, &rfd)) {
3812                         ttyread();
3813                         if(blinktimeout) {
3814                                 blinkset = tattrset(ATTR_BLINK);
3815                                 if(!blinkset)
3816                                         MODBIT(term.mode, 0, MODE_BLINK);
3817                         }
3818                 }
3819
3820                 if(FD_ISSET(xfd, &rfd))
3821                         xev = actionfps;
3822
3823                 clock_gettime(CLOCK_MONOTONIC, &now);
3824                 drawtimeout.tv_sec = 0;
3825                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3826                 tv = &drawtimeout;
3827
3828                 dodraw = 0;
3829                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3830                         tsetdirtattr(ATTR_BLINK);
3831                         term.mode ^= MODE_BLINK;
3832                         lastblink = now;
3833                         dodraw = 1;
3834                 }
3835                 deltatime = TIMEDIFF(now, last);
3836                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
3837                                 || deltatime < 0) {
3838                         dodraw = 1;
3839                         last = now;
3840                 }
3841
3842                 if(dodraw) {
3843                         while(XPending(xw.dpy)) {
3844                                 XNextEvent(xw.dpy, &ev);
3845                                 if(XFilterEvent(&ev, None))
3846                                         continue;
3847                                 if(handler[ev.type])
3848                                         (handler[ev.type])(&ev);
3849                         }
3850
3851                         draw();
3852                         XFlush(xw.dpy);
3853
3854                         if(xev && !FD_ISSET(xfd, &rfd))
3855                                 xev--;
3856                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
3857                                 if(blinkset) {
3858                                         if(TIMEDIFF(now, lastblink) \
3859                                                         > blinktimeout) {
3860                                                 drawtimeout.tv_nsec = 1000;
3861                                         } else {
3862                                                 drawtimeout.tv_nsec = (1E6 * \
3863                                                         (blinktimeout - \
3864                                                         TIMEDIFF(now,
3865                                                                 lastblink)));
3866                                         }
3867                                 } else {
3868                                         tv = NULL;
3869                                 }
3870                         }
3871                 }
3872         }
3873 }
3874
3875 void
3876 usage(void) {
3877         die("%s " VERSION " (c) 2010-2014 st engineers\n" \
3878         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
3879         "          [-i] [-t title] [-w windowid] [-e command ...]\n", argv0);
3880 }
3881
3882 int
3883 main(int argc, char *argv[]) {
3884         char *titles;
3885         uint cols = 80, rows = 24;
3886
3887         xw.l = xw.t = 0;
3888         xw.isfixed = False;
3889
3890         ARGBEGIN {
3891         case 'a':
3892                 allowaltscreen = false;
3893                 break;
3894         case 'c':
3895                 opt_class = EARGF(usage());
3896                 break;
3897         case 'e':
3898                 /* eat all remaining arguments */
3899                 if(argc > 1) {
3900                         opt_cmd = &argv[1];
3901                         if(argv[1] != NULL && opt_title == NULL) {
3902                                 titles = xstrdup(argv[1]);
3903                                 opt_title = basename(titles);
3904                         }
3905                 }
3906                 goto run;
3907         case 'f':
3908                 opt_font = EARGF(usage());
3909                 break;
3910         case 'g':
3911                 xw.gm = XParseGeometry(EARGF(usage()),
3912                                 &xw.l, &xw.t, &cols, &rows);
3913                 break;
3914         case 'i':
3915                 xw.isfixed = True;
3916                 break;
3917         case 'o':
3918                 opt_io = EARGF(usage());
3919                 break;
3920         case 't':
3921                 opt_title = EARGF(usage());
3922                 break;
3923         case 'w':
3924                 opt_embed = EARGF(usage());
3925                 break;
3926         case 'v':
3927         default:
3928                 usage();
3929         } ARGEND;
3930
3931 run:
3932         setlocale(LC_CTYPE, "");
3933         XSetLocaleModifiers("");
3934         tnew(cols? cols : 1, rows? rows : 1);
3935         xinit();
3936         selinit();
3937         run();
3938
3939         return 0;
3940 }
3941