st.c

   1 /* See LICENSE for licence details. */
   2 #define _XOPEN_SOURCE 600
   3 #include <ctype.h>
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <limits.h>
   7 #include <locale.h>
   8 #include <pwd.h>
   9 #include <stdarg.h>
  10 #include <stdbool.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <signal.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 <X11/Xatom.h>
  24 #include <X11/Xlib.h>
  25 #include <X11/Xutil.h>
  26 #include <X11/cursorfont.h>
  27 #include <X11/keysym.h>
  28 #include <X11/extensions/Xdbe.h>
  29 #include <X11/Xft/Xft.h>
  30 #include <fontconfig/fontconfig.h>
  31
  32 #define Glyph Glyph_
  33 #define Font Font_
  34 #define Draw XftDraw *
  35 #define Colour XftColor
  36 #define Colourmap Colormap
  37
  38 #if   defined(__linux)
  39  #include <pty.h>
  40 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  41  #include <util.h>
  42 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  43  #include <libutil.h>
  44 #endif
  45
  46 #define USAGE \
  47         "st " VERSION " (c) 2010-2012 st engineers\n" \
  48         "usage: st [-v] [-c class] [-f font] [-g geometry] [-o file]" \
  49         " [-t title] [-w windowid] [-e command ...]\n"
  50
  51 /* XEMBED messages */
  52 #define XEMBED_FOCUS_IN  4
  53 #define XEMBED_FOCUS_OUT 5
  54
  55 /* Arbitrary sizes */
  56 #define ESC_BUF_SIZ   256
  57 #define ESC_ARG_SIZ   16
  58 #define STR_BUF_SIZ   256
  59 #define STR_ARG_SIZ   16
  60 #define DRAW_BUF_SIZ  20*1024
  61 #define UTF_SIZ       4
  62 #define XK_NO_MOD     UINT_MAX
  63 #define XK_ANY_MOD    0
  64
  65 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  66
  67 /* macros */
  68 #define CLEANMASK(mask) (mask & (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask))
  69 #define SERRNO strerror(errno)
  70 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  71 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  72 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  73 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  74 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  75 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  76 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  77 #define IS_SET(flag) (term.mode & (flag))
  78 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  79
  80 #define VT102ID "\033[?6c"
  81
  82 enum glyph_attribute {
  83         ATTR_NULL      = 0,
  84         ATTR_REVERSE   = 1,
  85         ATTR_UNDERLINE = 2,
  86         ATTR_BOLD      = 4,
  87         ATTR_GFX       = 8,
  88         ATTR_ITALIC    = 16,
  89         ATTR_BLINK     = 32,
  90 };
  91
  92 enum cursor_movement {
  93         CURSOR_UP,
  94         CURSOR_DOWN,
  95         CURSOR_LEFT,
  96         CURSOR_RIGHT,
  97         CURSOR_SAVE,
  98         CURSOR_LOAD
  99 };
 100
 101 enum cursor_state {
 102         CURSOR_DEFAULT  = 0,
 103         CURSOR_WRAPNEXT = 1,
 104         CURSOR_ORIGIN   = 2
 105 };
 106
 107 enum glyph_state {
 108         GLYPH_SET   = 1,
 109         GLYPH_DIRTY = 2
 110 };
 111
 112 enum term_mode {
 113         MODE_WRAP        = 1,
 114         MODE_INSERT      = 2,
 115         MODE_APPKEYPAD   = 4,
 116         MODE_ALTSCREEN   = 8,
 117         MODE_CRLF        = 16,
 118         MODE_MOUSEBTN    = 32,
 119         MODE_MOUSEMOTION = 64,
 120         MODE_MOUSE       = 32|64,
 121         MODE_REVERSE     = 128,
 122         MODE_KBDLOCK     = 256,
 123         MODE_HIDE        = 512,
 124         MODE_ECHO        = 1024
 125 };
 126
 127 enum escape_state {
 128         ESC_START      = 1,
 129         ESC_CSI = 2,
 130         ESC_STR = 4, /* DSC, OSC, PM, APC */
 131         ESC_ALTCHARSET = 8,
 132         ESC_STR_END    = 16, /* a final string was encountered */
 133         ESC_TEST       = 32, /* Enter in test mode */
 134 };
 135
 136 enum window_state {
 137         WIN_VISIBLE = 1,
 138         WIN_REDRAW  = 2,
 139         WIN_FOCUSED = 4
 140 };
 141
 142 /* bit macro */
 143 #undef B0
 144 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
 145
 146 typedef unsigned char uchar;
 147 typedef unsigned int uint;
 148 typedef unsigned long ulong;
 149 typedef unsigned short ushort;
 150
 151 typedef struct {
 152         char c[UTF_SIZ];     /* character code */
 153         uchar mode;  /* attribute flags */
 154         ushort fg;   /* foreground  */
 155         ushort bg;   /* background  */
 156         uchar state; /* state flags    */
 157 } Glyph;
 158
 159 typedef Glyph* Line;
 160
 161 typedef struct {
 162         Glyph attr;      /* current char attributes */
 163         int x;
 164         int y;
 165         char state;
 166 } TCursor;
 167
 168 /* CSI Escape sequence structs */
 169 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 170 typedef struct {
 171         char buf[ESC_BUF_SIZ]; /* raw string */
 172         int len;               /* raw string length */
 173         char priv;
 174         int arg[ESC_ARG_SIZ];
 175         int narg;             /* nb of args */
 176         char mode;
 177 } CSIEscape;
 178
 179 /* STR Escape sequence structs */
 180 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 181 typedef struct {
 182         char type;           /* ESC type ... */
 183         char buf[STR_BUF_SIZ]; /* raw string */
 184         int len;               /* raw string length */
 185         char *args[STR_ARG_SIZ];
 186         int narg;             /* nb of args */
 187 } STREscape;
 188
 189 /* Internal representation of the screen */
 190 typedef struct {
 191         int row;        /* nb row */
 192         int col;        /* nb col */
 193         Line *line;     /* screen */
 194         Line *alt;      /* alternate screen */
 195         bool *dirty;    /* dirtyness of lines */
 196         TCursor c;      /* cursor */
 197         int top;        /* top    scroll limit */
 198         int bot;        /* bottom scroll limit */
 199         int mode;       /* terminal mode flags */
 200         int esc;        /* escape state flags */
 201         bool *tabs;
 202 } Term;
 203
 204 /* Purely graphic info */
 205 typedef struct {
 206         Display *dpy;
 207         Colourmap cmap;
 208         Window win;
 209         XdbeBackBuffer buf;
 210         Atom xembed, wmdeletewin;
 211         XIM xim;
 212         XIC xic;
 213         Draw draw;
 214         Visual *vis;
 215         int scr;
 216         bool isfixed; /* is fixed geometry? */
 217         int fx, fy, fw, fh; /* fixed geometry */
 218         int tw, th; /* tty width and height */
 219         int w;  /* window width */
 220         int h;  /* window height */
 221         int ch; /* char height */
 222         int cw; /* char width  */
 223         char state; /* focus, redraw, visible */
 224 } XWindow;
 225
 226 typedef struct {
 227         KeySym k;
 228         uint mask;
 229         char s[ESC_BUF_SIZ];
 230 } Key;
 231
 232 /* TODO: use better name for vars... */
 233 typedef struct {
 234         int mode;
 235         int bx, by;
 236         int ex, ey;
 237         struct {
 238                 int x, y;
 239         } b, e;
 240         char *clip;
 241         Atom xtarget;
 242         bool alt;
 243         struct timeval tclick1;
 244         struct timeval tclick2;
 245 } Selection;
 246
 247 typedef union {
 248         int i;
 249         unsigned int ui;
 250         float f;
 251         const void *v;
 252 } Arg;
 253
 254 typedef struct {
 255         unsigned int mod;
 256         KeySym keysym;
 257         void (*func)(const Arg *);
 258         const Arg arg;
 259 } Shortcut;
 260
 261 /* function definitions used in config.h */
 262 static void xzoom(const Arg *);
 263
 264 /* Config.h for applying patches and the configuration. */
 265 #include "config.h"
 266
 267 /* Font structure */
 268 typedef struct {
 269         int height;
 270         int width;
 271         int ascent;
 272         int descent;
 273         short lbearing;
 274         short rbearing;
 275         XftFont *set;
 276 } Font;
 277
 278 /* Drawing Context */
 279 typedef struct {
 280         Colour col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 281         Font font, bfont, ifont, ibfont;
 282 } DC;
 283
 284 static void die(const char *, ...);
 285 static void draw(void);
 286 static void redraw(void);
 287 static void drawregion(int, int, int, int);
 288 static void execsh(void);
 289 static void sigchld(int);
 290 static void run(void);
 291
 292 static void csidump(void);
 293 static void csihandle(void);
 294 static void csiparse(void);
 295 static void csireset(void);
 296 static void strdump(void);
 297 static void strhandle(void);
 298 static void strparse(void);
 299 static void strreset(void);
 300
 301 static void tclearregion(int, int, int, int);
 302 static void tcursor(int);
 303 static void tdeletechar(int);
 304 static void tdeleteline(int);
 305 static void tinsertblank(int);
 306 static void tinsertblankline(int);
 307 static void tmoveto(int, int);
 308 static void tmoveato(int x, int y);
 309 static void tnew(int, int);
 310 static void tnewline(int);
 311 static void tputtab(bool);
 312 static void tputc(char *, int);
 313 static void treset(void);
 314 static int tresize(int, int);
 315 static void tscrollup(int, int);
 316 static void tscrolldown(int, int);
 317 static void tsetattr(int*, int);
 318 static void tsetchar(char *, Glyph *, int, int);
 319 static void tsetscroll(int, int);
 320 static void tswapscreen(void);
 321 static void tsetdirt(int, int);
 322 static void tsetmode(bool, bool, int *, int);
 323 static void tfulldirt(void);
 324 static void techo(char *, int);
 325
 326 static void ttynew(void);
 327 static void ttyread(void);
 328 static void ttyresize(void);
 329 static void ttywrite(const char *, size_t);
 330
 331 static void xdraws(char *, Glyph, int, int, int, int);
 332 static void xhints(void);
 333 static void xclear(int, int, int, int);
 334 static void xdrawcursor(void);
 335 static void xinit(void);
 336 static void xloadcols(void);
 337 static void xresettitle(void);
 338 static void xseturgency(int);
 339 static void xsetsel(char*);
 340 static void xtermclear(int, int, int, int);
 341 static void xresize(int, int);
 342
 343 static void expose(XEvent *);
 344 static void visibility(XEvent *);
 345 static void unmap(XEvent *);
 346 static char *kmap(KeySym, uint);
 347 static void kpress(XEvent *);
 348 static void cmessage(XEvent *);
 349 static void cresize(int width, int height);
 350 static void resize(XEvent *);
 351 static void focus(XEvent *);
 352 static void brelease(XEvent *);
 353 static void bpress(XEvent *);
 354 static void bmotion(XEvent *);
 355 static void selnotify(XEvent *);
 356 static void selclear(XEvent *);
 357 static void selrequest(XEvent *);
 358
 359 static void selinit(void);
 360 static inline bool selected(int, int);
 361 static void selcopy(void);
 362 static void selpaste(void);
 363 static void selscroll(int, int);
 364
 365 static int utf8decode(char *, long *);
 366 static int utf8encode(long *, char *);
 367 static int utf8size(char *);
 368 static int isfullutf8(char *, int);
 369
 370 static ssize_t xwrite(int, char *, size_t);
 371 static void *xmalloc(size_t);
 372 static void *xrealloc(void *, size_t);
 373 static void *xcalloc(size_t nmemb, size_t size);
 374
 375 static void (*handler[LASTEvent])(XEvent *) = {
 376         [KeyPress] = kpress,
 377         [ClientMessage] = cmessage,
 378         [ConfigureNotify] = resize,
 379         [VisibilityNotify] = visibility,
 380         [UnmapNotify] = unmap,
 381         [Expose] = expose,
 382         [FocusIn] = focus,
 383         [FocusOut] = focus,
 384         [MotionNotify] = bmotion,
 385         [ButtonPress] = bpress,
 386         [ButtonRelease] = brelease,
 387         [SelectionClear] = selclear,
 388         [SelectionNotify] = selnotify,
 389         [SelectionRequest] = selrequest,
 390 };
 391
 392 /* Globals */
 393 static DC dc;
 394 static XWindow xw;
 395 static Term term;
 396 static CSIEscape csiescseq;
 397 static STREscape strescseq;
 398 static int cmdfd;
 399 static pid_t pid;
 400 static Selection sel;
 401 static int iofd = -1;
 402 static char **opt_cmd = NULL;
 403 static char *opt_io = NULL;
 404 static char *opt_title = NULL;
 405 static char *opt_embed = NULL;
 406 static char *opt_class = NULL;
 407 static char *opt_font = NULL;
 408
 409 static char *usedfont = NULL;
 410 static int usedfontsize = 0;
 411
 412 ssize_t
 413 xwrite(int fd, char *s, size_t len) {
 414         size_t aux = len;
 415
 416         while(len > 0) {
 417                 ssize_t r = write(fd, s, len);
 418                 if(r < 0)
 419                         return r;
 420                 len -= r;
 421                 s += r;
 422         }
 423         return aux;
 424 }
 425
 426 void *
 427 xmalloc(size_t len) {
 428         void *p = malloc(len);
 429
 430         if(!p)
 431                 die("Out of memory\n");
 432
 433         return p;
 434 }
 435
 436 void *
 437 xrealloc(void *p, size_t len) {
 438         if((p = realloc(p, len)) == NULL)
 439                 die("Out of memory\n");
 440
 441         return p;
 442 }
 443
 444 void *
 445 xcalloc(size_t nmemb, size_t size) {
 446         void *p = calloc(nmemb, size);
 447
 448         if(!p)
 449                 die("Out of memory\n");
 450
 451         return p;
 452 }
 453
 454 int
 455 utf8decode(char *s, long *u) {
 456         uchar c;
 457         int i, n, rtn;
 458
 459         rtn = 1;
 460         c = *s;
 461         if(~c & B7) { /* 0xxxxxxx */
 462                 *u = c;
 463                 return rtn;
 464         } else if((c & (B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 465                 *u = c&(B4|B3|B2|B1|B0);
 466                 n = 1;
 467         } else if((c & (B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 468                 *u = c&(B3|B2|B1|B0);
 469                 n = 2;
 470         } else if((c & (B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 471                 *u = c & (B2|B1|B0);
 472                 n = 3;
 473         } else {
 474                 goto invalid;
 475         }
 476
 477         for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
 478                 c = *s;
 479                 if((c & (B7|B6)) != B7) /* 10xxxxxx */
 480                         goto invalid;
 481                 *u <<= 6;
 482                 *u |= c & (B5|B4|B3|B2|B1|B0);
 483         }
 484
 485         if((n == 1 && *u < 0x80) ||
 486            (n == 2 && *u < 0x800) ||
 487            (n == 3 && *u < 0x10000) ||
 488            (*u >= 0xD800 && *u <= 0xDFFF)) {
 489                 goto invalid;
 490         }
 491
 492         return rtn;
 493 invalid:
 494         *u = 0xFFFD;
 495
 496         return rtn;
 497 }
 498
 499 int
 500 utf8encode(long *u, char *s) {
 501         uchar *sp;
 502         ulong uc;
 503         int i, n;
 504
 505         sp = (uchar *)s;
 506         uc = *u;
 507         if(uc < 0x80) {
 508                 *sp = uc; /* 0xxxxxxx */
 509                 return 1;
 510         } else if(*u < 0x800) {
 511                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 512                 n = 1;
 513         } else if(uc < 0x10000) {
 514                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 515                 n = 2;
 516         } else if(uc <= 0x10FFFF) {
 517                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 518                 n = 3;
 519         } else {
 520                 goto invalid;
 521         }
 522
 523         for(i=n,++sp; i>0; --i,++sp)
 524                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 525
 526         return n+1;
 527 invalid:
 528         /* U+FFFD */
 529         *s++ = '\xEF';
 530         *s++ = '\xBF';
 531         *s = '\xBD';
 532
 533         return 3;
 534 }
 535
 536 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 537    UTF-8 otherwise return 0 */
 538 int
 539 isfullutf8(char *s, int b) {
 540         uchar *c1, *c2, *c3;
 541
 542         c1 = (uchar *)s;
 543         c2 = (uchar *)++s;
 544         c3 = (uchar *)++s;
 545         if(b < 1) {
 546                 return 0;
 547         } else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1) {
 548                 return 0;
 549         } else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
 550             ((b == 1) ||
 551             ((b == 2) && (*c2&(B7|B6)) == B7))) {
 552                 return 0;
 553         } else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
 554             ((b == 1) ||
 555             ((b == 2) && (*c2&(B7|B6)) == B7) ||
 556             ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7))) {
 557                 return 0;
 558         } else {
 559                 return 1;
 560         }
 561 }
 562
 563 int
 564 utf8size(char *s) {
 565         uchar c = *s;
 566
 567         if(~c&B7) {
 568                 return 1;
 569         } else if((c&(B7|B6|B5)) == (B7|B6)) {
 570                 return 2;
 571         } else if((c&(B7|B6|B5|B4)) == (B7|B6|B5)) {
 572                 return 3;
 573         } else {
 574                 return 4;
 575         }
 576 }
 577
 578 void
 579 selinit(void) {
 580         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 581         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 582         sel.mode = 0;
 583         sel.bx = -1;
 584         sel.clip = NULL;
 585         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 586         if(sel.xtarget == None)
 587                 sel.xtarget = XA_STRING;
 588 }
 589
 590 static int
 591 x2col(int x) {
 592         x -= borderpx;
 593         x /= xw.cw;
 594
 595         return LIMIT(x, 0, term.col-1);
 596 }
 597
 598 static int
 599 y2row(int y) {
 600         y -= borderpx;
 601         y /= xw.ch;
 602
 603         return LIMIT(y, 0, term.row-1);
 604 }
 605
 606 static inline bool
 607 selected(int x, int y) {
 608         int bx, ex;
 609
 610         if(sel.ey == y && sel.by == y) {
 611                 bx = MIN(sel.bx, sel.ex);
 612                 ex = MAX(sel.bx, sel.ex);
 613                 return BETWEEN(x, bx, ex);
 614         }
 615
 616         return ((sel.b.y < y && y < sel.e.y)
 617                         || (y == sel.e.y && x <= sel.e.x))
 618                         || (y == sel.b.y && x >= sel.b.x
 619                                 && (x <= sel.e.x || sel.b.y != sel.e.y));
 620 }
 621
 622 void
 623 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 624         if(b)
 625                 *b = e->xbutton.button;
 626
 627         *x = x2col(e->xbutton.x);
 628         *y = y2row(e->xbutton.y);
 629
 630         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 631         sel.b.y = MIN(sel.by, sel.ey);
 632         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 633         sel.e.y = MAX(sel.by, sel.ey);
 634 }
 635
 636 void
 637 mousereport(XEvent *e) {
 638         int x = x2col(e->xbutton.x);
 639         int y = y2row(e->xbutton.y);
 640         int button = e->xbutton.button;
 641         int state = e->xbutton.state;
 642         char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
 643         static int ob, ox, oy;
 644
 645         /* from urxvt */
 646         if(e->xbutton.type == MotionNotify) {
 647                 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
 648                         return;
 649                 button = ob + 32;
 650                 ox = x, oy = y;
 651         } else if(e->xbutton.type == ButtonRelease || button == AnyButton) {
 652                 button = 3;
 653         } else {
 654                 button -= Button1;
 655                 if(button >= 3)
 656                         button += 64 - 3;
 657                 if(e->xbutton.type == ButtonPress) {
 658                         ob = button;
 659                         ox = x, oy = y;
 660                 }
 661         }
 662
 663         buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
 664                 + (state & Mod4Mask    ? 8  : 0)
 665                 + (state & ControlMask ? 16 : 0);
 666
 667         ttywrite(buf, sizeof(buf));
 668 }
 669
 670 void
 671 bpress(XEvent *e) {
 672         if(IS_SET(MODE_MOUSE)) {
 673                 mousereport(e);
 674         } else if(e->xbutton.button == Button1) {
 675                 if(sel.bx != -1) {
 676                         sel.bx = -1;
 677                         tsetdirt(sel.b.y, sel.e.y);
 678                         draw();
 679                 }
 680                 sel.mode = 1;
 681                 sel.ex = sel.bx = x2col(e->xbutton.x);
 682                 sel.ey = sel.by = y2row(e->xbutton.y);
 683         } else if(e->xbutton.button == Button4) {
 684                 ttywrite("\031", 1);
 685         } else if(e->xbutton.button == Button5) {
 686                 ttywrite("\005", 1);
 687         }
 688 }
 689
 690 void
 691 selcopy(void) {
 692         char *str, *ptr, *p;
 693         int x, y, bufsize, is_selected = 0, size;
 694         Glyph *gp, *last;
 695
 696         if(sel.bx == -1) {
 697                 str = NULL;
 698         } else {
 699                 bufsize = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
 700                 ptr = str = xmalloc(bufsize);
 701
 702                 /* append every set & selected glyph to the selection */
 703                 for(y = 0; y < term.row; y++) {
 704                         gp = &term.line[y][0];
 705                         last = gp + term.col;
 706
 707                         while(--last >= gp && !(last->state & GLYPH_SET))
 708                                 /* nothing */;
 709
 710                         for(x = 0; gp <= last; x++, ++gp) {
 711                                 if(!(is_selected = selected(x, y)))
 712                                         continue;
 713
 714                                 p = (gp->state & GLYPH_SET) ? gp->c : " ";
 715                                 size = utf8size(p);
 716                                 memcpy(ptr, p, size);
 717                                 ptr += size;
 718                         }
 719                         /* \n at the end of every selected line except for the last one */
 720                         if(is_selected && y < sel.e.y)
 721                                 *ptr++ = '\n';
 722                 }
 723                 *ptr = 0;
 724         }
 725         sel.alt = IS_SET(MODE_ALTSCREEN);
 726         xsetsel(str);
 727 }
 728
 729 void
 730 selnotify(XEvent *e) {
 731         ulong nitems, ofs, rem;
 732         int format;
 733         uchar *data;
 734         Atom type;
 735
 736         ofs = 0;
 737         do {
 738                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 739                                         False, AnyPropertyType, &type, &format,
 740                                         &nitems, &rem, &data)) {
 741                         fprintf(stderr, "Clipboard allocation failed\n");
 742                         return;
 743                 }
 744                 ttywrite((const char *) data, nitems * format / 8);
 745                 XFree(data);
 746                 /* number of 32-bit chunks returned */
 747                 ofs += nitems * format / 32;
 748         } while(rem > 0);
 749 }
 750
 751 void
 752 selpaste(void) {
 753         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
 754                         xw.win, CurrentTime);
 755 }
 756
 757 void selclear(XEvent *e) {
 758         if(sel.bx == -1)
 759                 return;
 760         sel.bx = -1;
 761         tsetdirt(sel.b.y, sel.e.y);
 762 }
 763
 764 void
 765 selrequest(XEvent *e) {
 766         XSelectionRequestEvent *xsre;
 767         XSelectionEvent xev;
 768         Atom xa_targets, string;
 769
 770         xsre = (XSelectionRequestEvent *) e;
 771         xev.type = SelectionNotify;
 772         xev.requestor = xsre->requestor;
 773         xev.selection = xsre->selection;
 774         xev.target = xsre->target;
 775         xev.time = xsre->time;
 776         /* reject */
 777         xev.property = None;
 778
 779         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 780         if(xsre->target == xa_targets) {
 781                 /* respond with the supported type */
 782                 string = sel.xtarget;
 783                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 784                                 XA_ATOM, 32, PropModeReplace,
 785                                 (uchar *) &string, 1);
 786                 xev.property = xsre->property;
 787         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
 788                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 789                                 xsre->target, 8, PropModeReplace,
 790                                 (uchar *) sel.clip, strlen(sel.clip));
 791                 xev.property = xsre->property;
 792         }
 793
 794         /* all done, send a notification to the listener */
 795         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
 796                 fprintf(stderr, "Error sending SelectionNotify event\n");
 797 }
 798
 799 void
 800 xsetsel(char *str) {
 801         /* register the selection for both the clipboard and the primary */
 802         Atom clipboard;
 803
 804         free(sel.clip);
 805         sel.clip = str;
 806
 807         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
 808
 809         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 810         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 811 }
 812
 813 void
 814 brelease(XEvent *e) {
 815         struct timeval now;
 816
 817         if(IS_SET(MODE_MOUSE)) {
 818                 mousereport(e);
 819                 return;
 820         }
 821
 822         if(e->xbutton.button == Button2) {
 823                 selpaste();
 824         } else if(e->xbutton.button == Button1) {
 825                 sel.mode = 0;
 826                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 827                 term.dirty[sel.ey] = 1;
 828                 if(sel.bx == sel.ex && sel.by == sel.ey) {
 829                         sel.bx = -1;
 830                         gettimeofday(&now, NULL);
 831
 832                         if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
 833                                 /* triple click on the line */
 834                                 sel.b.x = sel.bx = 0;
 835                                 sel.e.x = sel.ex = term.col;
 836                                 sel.b.y = sel.e.y = sel.ey;
 837                                 selcopy();
 838                         } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
 839                                 /* double click to select word */
 840                                 sel.bx = sel.ex;
 841                                 while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
 842                                                 term.line[sel.ey][sel.bx-1].c[0] != ' ') {
 843                                         sel.bx--;
 844                                 }
 845                                 sel.b.x = sel.bx;
 846                                 while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
 847                                                 term.line[sel.ey][sel.ex+1].c[0] != ' ') {
 848                                         sel.ex++;
 849                                 }
 850                                 sel.e.x = sel.ex;
 851                                 sel.b.y = sel.e.y = sel.ey;
 852                                 selcopy();
 853                         }
 854                 } else {
 855                         selcopy();
 856                 }
 857         }
 858
 859         memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
 860         gettimeofday(&sel.tclick1, NULL);
 861 }
 862
 863 void
 864 bmotion(XEvent *e) {
 865         int starty, endy, oldey, oldex;
 866
 867         if(IS_SET(MODE_MOUSE)) {
 868                 mousereport(e);
 869                 return;
 870         }
 871
 872         if(sel.mode) {
 873                 oldey = sel.ey;
 874                 oldex = sel.ex;
 875                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 876
 877                 if(oldey != sel.ey || oldex != sel.ex) {
 878                         starty = MIN(oldey, sel.ey);
 879                         endy = MAX(oldey, sel.ey);
 880                         tsetdirt(starty, endy);
 881                 }
 882         }
 883 }
 884
 885 void
 886 die(const char *errstr, ...) {
 887         va_list ap;
 888
 889         va_start(ap, errstr);
 890         vfprintf(stderr, errstr, ap);
 891         va_end(ap);
 892         exit(EXIT_FAILURE);
 893 }
 894
 895 void
 896 execsh(void) {
 897         char **args;
 898         char *envshell = getenv("SHELL");
 899         const struct passwd *pass = getpwuid(getuid());
 900         char buf[sizeof(long) * 8 + 1];
 901
 902         unsetenv("COLUMNS");
 903         unsetenv("LINES");
 904         unsetenv("TERMCAP");
 905
 906         if(pass) {
 907                 setenv("LOGNAME", pass->pw_name, 1);
 908                 setenv("USER", pass->pw_name, 1);
 909                 setenv("SHELL", pass->pw_shell, 0);
 910                 setenv("HOME", pass->pw_dir, 0);
 911         }
 912
 913         snprintf(buf, sizeof(buf), "%lu", xw.win);
 914         setenv("WINDOWID", buf, 1);
 915
 916         signal(SIGCHLD, SIG_DFL);
 917         signal(SIGHUP, SIG_DFL);
 918         signal(SIGINT, SIG_DFL);
 919         signal(SIGQUIT, SIG_DFL);
 920         signal(SIGTERM, SIG_DFL);
 921         signal(SIGALRM, SIG_DFL);
 922
 923         DEFAULT(envshell, shell);
 924         setenv("TERM", termname, 1);
 925         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
 926         execvp(args[0], args);
 927         exit(EXIT_FAILURE);
 928 }
 929
 930 void
 931 sigchld(int a) {
 932         int stat = 0;
 933
 934         if(waitpid(pid, &stat, 0) < 0)
 935                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 936
 937         if(WIFEXITED(stat)) {
 938                 exit(WEXITSTATUS(stat));
 939         } else {
 940                 exit(EXIT_FAILURE);
 941         }
 942 }
 943
 944 void
 945 ttynew(void) {
 946         int m, s;
 947         struct winsize w = {term.row, term.col, 0, 0};
 948
 949         /* seems to work fine on linux, openbsd and freebsd */
 950         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 951                 die("openpty failed: %s\n", SERRNO);
 952
 953         switch(pid = fork()) {
 954         case -1:
 955                 die("fork failed\n");
 956                 break;
 957         case 0:
 958                 setsid(); /* create a new process group */
 959                 dup2(s, STDIN_FILENO);
 960                 dup2(s, STDOUT_FILENO);
 961                 dup2(s, STDERR_FILENO);
 962                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 963                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 964                 close(s);
 965                 close(m);
 966                 execsh();
 967                 break;
 968         default:
 969                 close(s);
 970                 cmdfd = m;
 971                 signal(SIGCHLD, sigchld);
 972                 if(opt_io) {
 973                         iofd = (!strcmp(opt_io, "-")) ?
 974                                   STDOUT_FILENO :
 975                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
 976                         if(iofd < 0) {
 977                                 fprintf(stderr, "Error opening %s:%s\n",
 978                                         opt_io, strerror(errno));
 979                         }
 980                 }
 981         }
 982 }
 983
 984 void
 985 dump(char c) {
 986         static int col;
 987
 988         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 989         if(++col % 10 == 0)
 990                 fprintf(stderr, "\n");
 991 }
 992
 993 void
 994 ttyread(void) {
 995         static char buf[BUFSIZ];
 996         static int buflen = 0;
 997         char *ptr;
 998         char s[UTF_SIZ];
 999         int charsize; /* size of utf8 char in bytes */
1000         long utf8c;
1001         int ret;
1002
1003         /* append read bytes to unprocessed bytes */
1004         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1005                 die("Couldn't read from shell: %s\n", SERRNO);
1006
1007         /* process every complete utf8 char */
1008         buflen += ret;
1009         ptr = buf;
1010         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
1011                 charsize = utf8decode(ptr, &utf8c);
1012                 utf8encode(&utf8c, s);
1013                 tputc(s, charsize);
1014                 ptr += charsize;
1015                 buflen -= charsize;
1016         }
1017
1018         /* keep any uncomplete utf8 char for the next call */
1019         memmove(buf, ptr, buflen);
1020 }
1021
1022 void
1023 ttywrite(const char *s, size_t n) {
1024         if(write(cmdfd, s, n) == -1)
1025                 die("write error on tty: %s\n", SERRNO);
1026 }
1027
1028 void
1029 ttyresize(void) {
1030         struct winsize w;
1031
1032         w.ws_row = term.row;
1033         w.ws_col = term.col;
1034         w.ws_xpixel = xw.tw;
1035         w.ws_ypixel = xw.th;
1036         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1037                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
1038 }
1039
1040 void
1041 tsetdirt(int top, int bot) {
1042         int i;
1043
1044         LIMIT(top, 0, term.row-1);
1045         LIMIT(bot, 0, term.row-1);
1046
1047         for(i = top; i <= bot; i++)
1048                 term.dirty[i] = 1;
1049 }
1050
1051 void
1052 tfulldirt(void) {
1053         tsetdirt(0, term.row-1);
1054 }
1055
1056 void
1057 tcursor(int mode) {
1058         static TCursor c;
1059
1060         if(mode == CURSOR_SAVE) {
1061                 c = term.c;
1062         } else if(mode == CURSOR_LOAD) {
1063                 term.c = c;
1064                 tmoveto(c.x, c.y);
1065         }
1066 }
1067
1068 void
1069 treset(void) {
1070         uint i;
1071
1072         term.c = (TCursor){{
1073                 .mode = ATTR_NULL,
1074                 .fg = defaultfg,
1075                 .bg = defaultbg
1076         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1077
1078         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1079         for(i = tabspaces; i < term.col; i += tabspaces)
1080                 term.tabs[i] = 1;
1081         term.top = 0;
1082         term.bot = term.row - 1;
1083         term.mode = MODE_WRAP;
1084
1085         tclearregion(0, 0, term.col-1, term.row-1);
1086         tmoveto(0, 0);
1087         tcursor(CURSOR_SAVE);
1088 }
1089
1090 void
1091 tnew(int col, int row) {
1092         /* set screen size */
1093         term.row = row;
1094         term.col = col;
1095         term.line = xmalloc(term.row * sizeof(Line));
1096         term.alt  = xmalloc(term.row * sizeof(Line));
1097         term.dirty = xmalloc(term.row * sizeof(*term.dirty));
1098         term.tabs = xmalloc(term.col * sizeof(*term.tabs));
1099
1100         for(row = 0; row < term.row; row++) {
1101                 term.line[row] = xmalloc(term.col * sizeof(Glyph));
1102                 term.alt [row] = xmalloc(term.col * sizeof(Glyph));
1103                 term.dirty[row] = 0;
1104         }
1105         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1106         /* setup screen */
1107         treset();
1108 }
1109
1110 void
1111 tswapscreen(void) {
1112         Line *tmp = term.line;
1113
1114         term.line = term.alt;
1115         term.alt = tmp;
1116         term.mode ^= MODE_ALTSCREEN;
1117         tfulldirt();
1118 }
1119
1120 void
1121 tscrolldown(int orig, int n) {
1122         int i;
1123         Line temp;
1124
1125         LIMIT(n, 0, term.bot-orig+1);
1126
1127         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1128
1129         for(i = term.bot; i >= orig+n; i--) {
1130                 temp = term.line[i];
1131                 term.line[i] = term.line[i-n];
1132                 term.line[i-n] = temp;
1133
1134                 term.dirty[i] = 1;
1135                 term.dirty[i-n] = 1;
1136         }
1137
1138         selscroll(orig, n);
1139 }
1140
1141 void
1142 tscrollup(int orig, int n) {
1143         int i;
1144         Line temp;
1145         LIMIT(n, 0, term.bot-orig+1);
1146
1147         tclearregion(0, orig, term.col-1, orig+n-1);
1148
1149         for(i = orig; i <= term.bot-n; i++) {
1150                  temp = term.line[i];
1151                  term.line[i] = term.line[i+n];
1152                  term.line[i+n] = temp;
1153
1154                  term.dirty[i] = 1;
1155                  term.dirty[i+n] = 1;
1156         }
1157
1158         selscroll(orig, -n);
1159 }
1160
1161 void
1162 selscroll(int orig, int n) {
1163         if(sel.bx == -1)
1164                 return;
1165
1166         if(BETWEEN(sel.by, orig, term.bot) || BETWEEN(sel.ey, orig, term.bot)) {
1167                 if((sel.by += n) > term.bot || (sel.ey += n) < term.top) {
1168                         sel.bx = -1;
1169                         return;
1170                 }
1171                 if(sel.by < term.top) {
1172                         sel.by = term.top;
1173                         sel.bx = 0;
1174                 }
1175                 if(sel.ey > term.bot) {
1176                         sel.ey = term.bot;
1177                         sel.ex = term.col;
1178                 }
1179                 sel.b.y = sel.by, sel.b.x = sel.bx;
1180                 sel.e.y = sel.ey, sel.e.x = sel.ex;
1181         }
1182 }
1183
1184 void
1185 tnewline(int first_col) {
1186         int y = term.c.y;
1187
1188         if(y == term.bot) {
1189                 tscrollup(term.top, 1);
1190         } else {
1191                 y++;
1192         }
1193         tmoveto(first_col ? 0 : term.c.x, y);
1194 }
1195
1196 void
1197 csiparse(void) {
1198         /* int noarg = 1; */
1199         char *p = csiescseq.buf;
1200
1201         csiescseq.narg = 0;
1202         if(*p == '?')
1203                 csiescseq.priv = 1, p++;
1204
1205         while(p < csiescseq.buf+csiescseq.len) {
1206                 while(isdigit(*p)) {
1207                         csiescseq.arg[csiescseq.narg] *= 10;
1208                         csiescseq.arg[csiescseq.narg] += *p++ - '0'/*, noarg = 0 */;
1209                 }
1210                 if(*p == ';' && csiescseq.narg+1 < ESC_ARG_SIZ) {
1211                         csiescseq.narg++, p++;
1212                 } else {
1213                         csiescseq.mode = *p;
1214                         csiescseq.narg++;
1215
1216                         return;
1217                 }
1218         }
1219 }
1220
1221 /* for absolute user moves, when decom is set */
1222 void
1223 tmoveato(int x, int y) {
1224         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1225 }
1226
1227 void
1228 tmoveto(int x, int y) {
1229         int miny, maxy;
1230
1231         if(term.c.state & CURSOR_ORIGIN) {
1232                 miny = term.top;
1233                 maxy = term.bot;
1234         } else {
1235                 miny = 0;
1236                 maxy = term.row - 1;
1237         }
1238         LIMIT(x, 0, term.col-1);
1239         LIMIT(y, miny, maxy);
1240         term.c.state &= ~CURSOR_WRAPNEXT;
1241         term.c.x = x;
1242         term.c.y = y;
1243 }
1244
1245 void
1246 tsetchar(char *c, Glyph *attr, int x, int y) {
1247         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1248                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1249                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1250                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1251                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1252                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1253                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1254                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1255                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1256         };
1257
1258         /*
1259          * The table is proudly stolen from rxvt.
1260          */
1261         if(attr->mode & ATTR_GFX) {
1262                 if(c[0] >= 0x41 && c[0] <= 0x7e
1263                                 && vt100_0[c[0] - 0x41]) {
1264                         c = vt100_0[c[0] - 0x41];
1265                 }
1266         }
1267
1268         term.dirty[y] = 1;
1269         term.line[y][x] = *attr;
1270         memcpy(term.line[y][x].c, c, UTF_SIZ);
1271         term.line[y][x].state |= GLYPH_SET;
1272 }
1273
1274 void
1275 tclearregion(int x1, int y1, int x2, int y2) {
1276         int x, y, temp;
1277
1278         if(x1 > x2)
1279                 temp = x1, x1 = x2, x2 = temp;
1280         if(y1 > y2)
1281                 temp = y1, y1 = y2, y2 = temp;
1282
1283         LIMIT(x1, 0, term.col-1);
1284         LIMIT(x2, 0, term.col-1);
1285         LIMIT(y1, 0, term.row-1);
1286         LIMIT(y2, 0, term.row-1);
1287
1288         for(y = y1; y <= y2; y++) {
1289                 term.dirty[y] = 1;
1290                 for(x = x1; x <= x2; x++)
1291                         term.line[y][x].state = 0;
1292         }
1293 }
1294
1295 void
1296 tdeletechar(int n) {
1297         int src = term.c.x + n;
1298         int dst = term.c.x;
1299         int size = term.col - src;
1300
1301         term.dirty[term.c.y] = 1;
1302
1303         if(src >= term.col) {
1304                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1305                 return;
1306         }
1307
1308         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1309                         size * sizeof(Glyph));
1310         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1311 }
1312
1313 void
1314 tinsertblank(int n) {
1315         int src = term.c.x;
1316         int dst = src + n;
1317         int size = term.col - dst;
1318
1319         term.dirty[term.c.y] = 1;
1320
1321         if(dst >= term.col) {
1322                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1323                 return;
1324         }
1325
1326         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1327                         size * sizeof(Glyph));
1328         tclearregion(src, term.c.y, dst - 1, term.c.y);
1329 }
1330
1331 void
1332 tinsertblankline(int n) {
1333         if(term.c.y < term.top || term.c.y > term.bot)
1334                 return;
1335
1336         tscrolldown(term.c.y, n);
1337 }
1338
1339 void
1340 tdeleteline(int n) {
1341         if(term.c.y < term.top || term.c.y > term.bot)
1342                 return;
1343
1344         tscrollup(term.c.y, n);
1345 }
1346
1347 void
1348 tsetattr(int *attr, int l) {
1349         int i;
1350
1351         for(i = 0; i < l; i++) {
1352                 switch(attr[i]) {
1353                 case 0:
1354                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD \
1355                                         | ATTR_ITALIC | ATTR_BLINK);
1356                         term.c.attr.fg = defaultfg;
1357                         term.c.attr.bg = defaultbg;
1358                         break;
1359                 case 1:
1360                         term.c.attr.mode |= ATTR_BOLD;
1361                         break;
1362                 case 3: /* enter standout (highlight) */
1363                         term.c.attr.mode |= ATTR_ITALIC;
1364                         break;
1365                 case 4:
1366                         term.c.attr.mode |= ATTR_UNDERLINE;
1367                         break;
1368                 case 5:
1369                         term.c.attr.mode |= ATTR_BLINK;
1370                         break;
1371                 case 7:
1372                         term.c.attr.mode |= ATTR_REVERSE;
1373                         break;
1374                 case 21:
1375                 case 22:
1376                         term.c.attr.mode &= ~ATTR_BOLD;
1377                         break;
1378                 case 23: /* leave standout (highlight) mode */
1379                         term.c.attr.mode &= ~ATTR_ITALIC;
1380                         break;
1381                 case 24:
1382                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1383                         break;
1384                 case 25:
1385                         term.c.attr.mode &= ~ATTR_BLINK;
1386                         break;
1387                 case 27:
1388                         term.c.attr.mode &= ~ATTR_REVERSE;
1389                         break;
1390                 case 38:
1391                         if(i + 2 < l && attr[i + 1] == 5) {
1392                                 i += 2;
1393                                 if(BETWEEN(attr[i], 0, 255)) {
1394                                         term.c.attr.fg = attr[i];
1395                                 } else {
1396                                         fprintf(stderr,
1397                                                 "erresc: bad fgcolor %d\n",
1398                                                 attr[i]);
1399                                 }
1400                         } else {
1401                                 fprintf(stderr,
1402                                         "erresc(38): gfx attr %d unknown\n",
1403                                         attr[i]);
1404                         }
1405                         break;
1406                 case 39:
1407                         term.c.attr.fg = defaultfg;
1408                         break;
1409                 case 48:
1410                         if(i + 2 < l && attr[i + 1] == 5) {
1411                                 i += 2;
1412                                 if(BETWEEN(attr[i], 0, 255)) {
1413                                         term.c.attr.bg = attr[i];
1414                                 } else {
1415                                         fprintf(stderr,
1416                                                 "erresc: bad bgcolor %d\n",
1417                                                 attr[i]);
1418                                 }
1419                         } else {
1420                                 fprintf(stderr,
1421                                         "erresc(48): gfx attr %d unknown\n",
1422                                         attr[i]);
1423                         }
1424                         break;
1425                 case 49:
1426                         term.c.attr.bg = defaultbg;
1427                         break;
1428                 default:
1429                         if(BETWEEN(attr[i], 30, 37)) {
1430                                 term.c.attr.fg = attr[i] - 30;
1431                         } else if(BETWEEN(attr[i], 40, 47)) {
1432                                 term.c.attr.bg = attr[i] - 40;
1433                         } else if(BETWEEN(attr[i], 90, 97)) {
1434                                 term.c.attr.fg = attr[i] - 90 + 8;
1435                         } else if(BETWEEN(attr[i], 100, 107)) {
1436                                 term.c.attr.bg = attr[i] - 100 + 8;
1437                         } else {
1438                                 fprintf(stderr,
1439                                         "erresc(default): gfx attr %d unknown\n",
1440                                         attr[i]), csidump();
1441                         }
1442                         break;
1443                 }
1444         }
1445 }
1446
1447 void
1448 tsetscroll(int t, int b) {
1449         int temp;
1450
1451         LIMIT(t, 0, term.row-1);
1452         LIMIT(b, 0, term.row-1);
1453         if(t > b) {
1454                 temp = t;
1455                 t = b;
1456                 b = temp;
1457         }
1458         term.top = t;
1459         term.bot = b;
1460 }
1461
1462 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1463
1464 void
1465 tsetmode(bool priv, bool set, int *args, int narg) {
1466         int *lim, mode;
1467         bool alt;
1468
1469         for(lim = args + narg; args < lim; ++args) {
1470                 if(priv) {
1471                         switch(*args) {
1472                                 break;
1473                         case 1: /* DECCKM -- Cursor key */
1474                                 MODBIT(term.mode, set, MODE_APPKEYPAD);
1475                                 break;
1476                         case 5: /* DECSCNM -- Reverse video */
1477                                 mode = term.mode;
1478                                 MODBIT(term.mode, set, MODE_REVERSE);
1479                                 if(mode != term.mode)
1480                                         redraw();
1481                                 break;
1482                         case 6: /* DECOM -- Origin */
1483                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1484                                 tmoveato(0, 0);
1485                                 break;
1486                         case 7: /* DECAWM -- Auto wrap */
1487                                 MODBIT(term.mode, set, MODE_WRAP);
1488                                 break;
1489                         case 0:  /* Error (IGNORED) */
1490                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1491                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1492                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1493                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1494                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1495                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1496                         case 42: /* DECNRCM -- National characters (IGNORED) */
1497                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1498                                 break;
1499                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1500                                 MODBIT(term.mode, !set, MODE_HIDE);
1501                                 break;
1502                         case 1000: /* 1000,1002: enable xterm mouse report */
1503                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1504                                 break;
1505                         case 1002:
1506                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1507                                 break;
1508                         case 1049: /* = 1047 and 1048 */
1509                         case 47:
1510                         case 1047: {
1511                                 alt = IS_SET(MODE_ALTSCREEN) != 0;
1512                                 if(alt)
1513                                         tclearregion(0, 0, term.col-1, term.row-1);
1514                                 if(set ^ alt)           /* set is always 1 or 0 */
1515                                         tswapscreen();
1516                                 if(*args != 1049)
1517                                         break;
1518                         }
1519                                 /* pass through */
1520                         case 1048:
1521                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1522                                 break;
1523                         default:
1524                                 fprintf(stderr,
1525                                         "erresc: unknown private set/reset mode %d\n",
1526                                         *args);
1527                                 break;
1528                         }
1529                 } else {
1530                         switch(*args) {
1531                         case 0:  /* Error (IGNORED) */
1532                                 break;
1533                         case 2:  /* KAM -- keyboard action */
1534                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1535                                 break;
1536                         case 4:  /* IRM -- Insertion-replacement */
1537                                 MODBIT(term.mode, set, MODE_INSERT);
1538                                 break;
1539                         case 12: /* SRM -- Send/Receive */
1540                                 MODBIT(term.mode, !set, MODE_ECHO);
1541                                 break;
1542                         case 20: /* LNM -- Linefeed/new line */
1543                                 MODBIT(term.mode, set, MODE_CRLF);
1544                                 break;
1545                         default:
1546                                 fprintf(stderr,
1547                                         "erresc: unknown set/reset mode %d\n",
1548                                         *args);
1549                                 break;
1550                         }
1551                 }
1552         }
1553 }
1554 #undef MODBIT
1555
1556
1557 void
1558 csihandle(void) {
1559         switch(csiescseq.mode) {
1560         default:
1561         unknown:
1562                 fprintf(stderr, "erresc: unknown csi ");
1563                 csidump();
1564                 /* die(""); */
1565                 break;
1566         case '@': /* ICH -- Insert <n> blank char */
1567                 DEFAULT(csiescseq.arg[0], 1);
1568                 tinsertblank(csiescseq.arg[0]);
1569                 break;
1570         case 'A': /* CUU -- Cursor <n> Up */
1571                 DEFAULT(csiescseq.arg[0], 1);
1572                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1573                 break;
1574         case 'B': /* CUD -- Cursor <n> Down */
1575         case 'e': /* VPR --Cursor <n> Down */
1576                 DEFAULT(csiescseq.arg[0], 1);
1577                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1578                 break;
1579         case 'c': /* DA -- Device Attributes */
1580                 if(csiescseq.arg[0] == 0)
1581                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1582                 break;
1583         case 'C': /* CUF -- Cursor <n> Forward */
1584         case 'a': /* HPR -- Cursor <n> Forward */
1585                 DEFAULT(csiescseq.arg[0], 1);
1586                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1587                 break;
1588         case 'D': /* CUB -- Cursor <n> Backward */
1589                 DEFAULT(csiescseq.arg[0], 1);
1590                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1591                 break;
1592         case 'E': /* CNL -- Cursor <n> Down and first col */
1593                 DEFAULT(csiescseq.arg[0], 1);
1594                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1595                 break;
1596         case 'F': /* CPL -- Cursor <n> Up and first col */
1597                 DEFAULT(csiescseq.arg[0], 1);
1598                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1599                 break;
1600         case 'g': /* TBC -- Tabulation clear */
1601                 switch (csiescseq.arg[0]) {
1602                 case 0: /* clear current tab stop */
1603                         term.tabs[term.c.x] = 0;
1604                         break;
1605                 case 3: /* clear all the tabs */
1606                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1607                         break;
1608                 default:
1609                         goto unknown;
1610                 }
1611                 break;
1612         case 'G': /* CHA -- Move to <col> */
1613         case '`': /* HPA */
1614                 DEFAULT(csiescseq.arg[0], 1);
1615                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1616                 break;
1617         case 'H': /* CUP -- Move to <row> <col> */
1618         case 'f': /* HVP */
1619                 DEFAULT(csiescseq.arg[0], 1);
1620                 DEFAULT(csiescseq.arg[1], 1);
1621                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1622                 break;
1623         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1624                 DEFAULT(csiescseq.arg[0], 1);
1625                 while(csiescseq.arg[0]--)
1626                         tputtab(1);
1627                 break;
1628         case 'J': /* ED -- Clear screen */
1629                 sel.bx = -1;
1630                 switch(csiescseq.arg[0]) {
1631                 case 0: /* below */
1632                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1633                         if(term.c.y < term.row-1)
1634                                 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1635                         break;
1636                 case 1: /* above */
1637                         if(term.c.y > 1)
1638                                 tclearregion(0, 0, term.col-1, term.c.y-1);
1639                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1640                         break;
1641                 case 2: /* all */
1642                         tclearregion(0, 0, term.col-1, term.row-1);
1643                         break;
1644                 default:
1645                         goto unknown;
1646                 }
1647                 break;
1648         case 'K': /* EL -- Clear line */
1649                 switch(csiescseq.arg[0]) {
1650                 case 0: /* right */
1651                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1652                         break;
1653                 case 1: /* left */
1654                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1655                         break;
1656                 case 2: /* all */
1657                         tclearregion(0, term.c.y, term.col-1, term.c.y);
1658                         break;
1659                 }
1660                 break;
1661         case 'S': /* SU -- Scroll <n> line up */
1662                 DEFAULT(csiescseq.arg[0], 1);
1663                 tscrollup(term.top, csiescseq.arg[0]);
1664                 break;
1665         case 'T': /* SD -- Scroll <n> line down */
1666                 DEFAULT(csiescseq.arg[0], 1);
1667                 tscrolldown(term.top, csiescseq.arg[0]);
1668                 break;
1669         case 'L': /* IL -- Insert <n> blank lines */
1670                 DEFAULT(csiescseq.arg[0], 1);
1671                 tinsertblankline(csiescseq.arg[0]);
1672                 break;
1673         case 'l': /* RM -- Reset Mode */
1674                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
1675                 break;
1676         case 'M': /* DL -- Delete <n> lines */
1677                 DEFAULT(csiescseq.arg[0], 1);
1678                 tdeleteline(csiescseq.arg[0]);
1679                 break;
1680         case 'X': /* ECH -- Erase <n> char */
1681                 DEFAULT(csiescseq.arg[0], 1);
1682                 tclearregion(term.c.x, term.c.y, term.c.x + csiescseq.arg[0], term.c.y);
1683                 break;
1684         case 'P': /* DCH -- Delete <n> char */
1685                 DEFAULT(csiescseq.arg[0], 1);
1686                 tdeletechar(csiescseq.arg[0]);
1687                 break;
1688         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1689                 DEFAULT(csiescseq.arg[0], 1);
1690                 while(csiescseq.arg[0]--)
1691                         tputtab(0);
1692                 break;
1693         case 'd': /* VPA -- Move to <row> */
1694                 DEFAULT(csiescseq.arg[0], 1);
1695                 tmoveato(term.c.x, csiescseq.arg[0]-1);
1696                 break;
1697         case 'h': /* SM -- Set terminal mode */
1698                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
1699                 break;
1700         case 'm': /* SGR -- Terminal attribute (color) */
1701                 tsetattr(csiescseq.arg, csiescseq.narg);
1702                 break;
1703         case 'r': /* DECSTBM -- Set Scrolling Region */
1704                 if(csiescseq.priv) {
1705                         goto unknown;
1706                 } else {
1707                         DEFAULT(csiescseq.arg[0], 1);
1708                         DEFAULT(csiescseq.arg[1], term.row);
1709                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
1710                         tmoveato(0, 0);
1711                 }
1712                 break;
1713         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1714                 tcursor(CURSOR_SAVE);
1715                 break;
1716         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1717                 tcursor(CURSOR_LOAD);
1718                 break;
1719         }
1720 }
1721
1722 void
1723 csidump(void) {
1724         int i;
1725         uint c;
1726
1727         printf("ESC[");
1728         for(i = 0; i < csiescseq.len; i++) {
1729                 c = csiescseq.buf[i] & 0xff;
1730                 if(isprint(c)) {
1731                         putchar(c);
1732                 } else if(c == '\n') {
1733                         printf("(\\n)");
1734                 } else if(c == '\r') {
1735                         printf("(\\r)");
1736                 } else if(c == 0x1b) {
1737                         printf("(\\e)");
1738                 } else {
1739                         printf("(%02x)", c);
1740                 }
1741         }
1742         putchar('\n');
1743 }
1744
1745 void
1746 csireset(void) {
1747         memset(&csiescseq, 0, sizeof(csiescseq));
1748 }
1749
1750 void
1751 strhandle(void) {
1752         char *p;
1753
1754         /*
1755          * TODO: make this being useful in case of color palette change.
1756          */
1757         strparse();
1758
1759         p = strescseq.buf;
1760
1761         switch(strescseq.type) {
1762         case ']': /* OSC -- Operating System Command */
1763                 switch(p[0]) {
1764                 case '0':
1765                 case '1':
1766                 case '2':
1767                         /*
1768                          * TODO: Handle special chars in string, like umlauts.
1769                          */
1770                         if(p[1] == ';') {
1771                                 XStoreName(xw.dpy, xw.win, strescseq.buf+2);
1772                         }
1773                         break;
1774                 case ';':
1775                         XStoreName(xw.dpy, xw.win, strescseq.buf+1);
1776                         break;
1777                 case '4': /* TODO: Set color (arg0) to "rgb:%hexr/$hexg/$hexb" (arg1) */
1778                         break;
1779                 default:
1780                         fprintf(stderr, "erresc: unknown str ");
1781                         strdump();
1782                         break;
1783                 }
1784                 break;
1785         case 'k': /* old title set compatibility */
1786                 XStoreName(xw.dpy, xw.win, strescseq.buf);
1787                 break;
1788         case 'P': /* DSC -- Device Control String */
1789         case '_': /* APC -- Application Program Command */
1790         case '^': /* PM -- Privacy Message */
1791         default:
1792                 fprintf(stderr, "erresc: unknown str ");
1793                 strdump();
1794                 /* die(""); */
1795                 break;
1796         }
1797 }
1798
1799 void
1800 strparse(void) {
1801         /*
1802          * TODO: Implement parsing like for CSI when required.
1803          * Format: ESC type cmd ';' arg0 [';' argn] ESC \
1804          */
1805         return;
1806 }
1807
1808 void
1809 strdump(void) {
1810         int i;
1811         uint c;
1812
1813         printf("ESC%c", strescseq.type);
1814         for(i = 0; i < strescseq.len; i++) {
1815                 c = strescseq.buf[i] & 0xff;
1816                 if(isprint(c)) {
1817                         putchar(c);
1818                 } else if(c == '\n') {
1819                         printf("(\\n)");
1820                 } else if(c == '\r') {
1821                         printf("(\\r)");
1822                 } else if(c == 0x1b) {
1823                         printf("(\\e)");
1824                 } else {
1825                         printf("(%02x)", c);
1826                 }
1827         }
1828         printf("ESC\\\n");
1829 }
1830
1831 void
1832 strreset(void) {
1833         memset(&strescseq, 0, sizeof(strescseq));
1834 }
1835
1836 void
1837 tputtab(bool forward) {
1838         uint x = term.c.x;
1839
1840         if(forward) {
1841                 if(x == term.col)
1842                         return;
1843                 for(++x; x < term.col && !term.tabs[x]; ++x)
1844                         /* nothing */ ;
1845         } else {
1846                 if(x == 0)
1847                         return;
1848                 for(--x; x > 0 && !term.tabs[x]; --x)
1849                         /* nothing */ ;
1850         }
1851         tmoveto(x, term.c.y);
1852 }
1853
1854 void
1855 techo(char *buf, int len) {
1856         for(; len > 0; buf++, len--) {
1857                 char c = *buf;
1858
1859                 if(c == '\033') {               /* escape */
1860                         tputc("^", 1);
1861                         tputc("[", 1);
1862                 } else if (c < '\x20') {        /* control code */
1863                         if(c != '\n' && c != '\r' && c != '\t') {
1864                                 c |= '\x40';
1865                                 tputc("^", 1);
1866                         }
1867                         tputc(&c, 1);
1868                 } else {
1869                         break;
1870                 }
1871         }
1872         if (len)
1873                 tputc(buf, len);
1874 }
1875
1876 void
1877 tputc(char *c, int len) {
1878         uchar ascii = *c;
1879         bool control = ascii < '\x20' || ascii == 0177;
1880
1881         if(iofd != -1) {
1882                 if (xwrite(iofd, c, len) < 0) {
1883                         fprintf(stderr, "Error writting in %s:%s\n",
1884                                 opt_io, strerror(errno));
1885                         close(iofd);
1886                         iofd = -1;
1887                 }
1888         }
1889         /*
1890          * STR sequences must be checked before anything else
1891          * because it can use some control codes as part of the sequence.
1892          */
1893         if(term.esc & ESC_STR) {
1894                 switch(ascii) {
1895                 case '\033':
1896                         term.esc = ESC_START | ESC_STR_END;
1897                         break;
1898                 case '\a': /* backwards compatibility to xterm */
1899                         term.esc = 0;
1900                         strhandle();
1901                         break;
1902                 default:
1903                         strescseq.buf[strescseq.len++] = ascii;
1904                         if(strescseq.len+1 >= STR_BUF_SIZ) {
1905                                 term.esc = 0;
1906                                 strhandle();
1907                         }
1908                 }
1909                 return;
1910         }
1911
1912         /*
1913          * Actions of control codes must be performed as soon they arrive
1914          * because they can be embedded inside a control sequence, and
1915          * they must not cause conflicts with sequences.
1916          */
1917         if(control) {
1918                 switch(ascii) {
1919                 case '\t':      /* HT */
1920                         tputtab(1);
1921                         return;
1922                 case '\b':      /* BS */
1923                         tmoveto(term.c.x-1, term.c.y);
1924                         return;
1925                 case '\r':      /* CR */
1926                         tmoveto(0, term.c.y);
1927                         return;
1928                 case '\f':      /* LF */
1929                 case '\v':      /* VT */
1930                 case '\n':      /* LF */
1931                         /* go to first col if the mode is set */
1932                         tnewline(IS_SET(MODE_CRLF));
1933                         return;
1934                 case '\a':      /* BEL */
1935                         if(!(xw.state & WIN_FOCUSED))
1936                                 xseturgency(1);
1937                         return;
1938                 case '\033':    /* ESC */
1939                         csireset();
1940                         term.esc = ESC_START;
1941                         return;
1942                 case '\016':    /* SO */
1943                         term.c.attr.mode |= ATTR_GFX;
1944                         return;
1945                 case '\017':    /* SI */
1946                         term.c.attr.mode &= ~ATTR_GFX;
1947                         return;
1948                 case '\032':    /* SUB */
1949                 case '\030':    /* CAN */
1950                         csireset();
1951                         return;
1952                 case '\005':    /* ENQ (IGNORED) */
1953                 case '\000':    /* NUL (IGNORED) */
1954                 case '\021':    /* XON (IGNORED) */
1955                 case '\023':    /* XOFF (IGNORED) */
1956                 case 0177:      /* DEL (IGNORED) */
1957                         return;
1958                 }
1959         } else if(term.esc & ESC_START) {
1960                 if(term.esc & ESC_CSI) {
1961                         csiescseq.buf[csiescseq.len++] = ascii;
1962                         if(BETWEEN(ascii, 0x40, 0x7E)
1963                                         || csiescseq.len >= ESC_BUF_SIZ) {
1964                                 term.esc = 0;
1965                                 csiparse(), csihandle();
1966                         }
1967                 } else if(term.esc & ESC_STR_END) {
1968                         term.esc = 0;
1969                         if(ascii == '\\')
1970                                 strhandle();
1971                 } else if(term.esc & ESC_ALTCHARSET) {
1972                         switch(ascii) {
1973                         case '0': /* Line drawing set */
1974                                 term.c.attr.mode |= ATTR_GFX;
1975                                 break;
1976                         case 'B': /* USASCII */
1977                                 term.c.attr.mode &= ~ATTR_GFX;
1978                                 break;
1979                         case 'A': /* UK (IGNORED) */
1980                         case '<': /* multinational charset (IGNORED) */
1981                         case '5': /* Finnish (IGNORED) */
1982                         case 'C': /* Finnish (IGNORED) */
1983                         case 'K': /* German (IGNORED) */
1984                                 break;
1985                         default:
1986                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1987                         }
1988                         term.esc = 0;
1989                 } else if(term.esc & ESC_TEST) {
1990                         if(ascii == '8') { /* DEC screen alignment test. */
1991                                 char E[UTF_SIZ] = "E";
1992                                 int x, y;
1993
1994                                 for(x = 0; x < term.col; ++x) {
1995                                         for(y = 0; y < term.row; ++y)
1996                                                 tsetchar(E, &term.c.attr, x, y);
1997                                 }
1998                         }
1999                         term.esc = 0;
2000                 } else {
2001                         switch(ascii) {
2002                         case '[':
2003                                 term.esc |= ESC_CSI;
2004                                 break;
2005                         case '#':
2006                                 term.esc |= ESC_TEST;
2007                                 break;
2008                         case 'P': /* DCS -- Device Control String */
2009                         case '_': /* APC -- Application Program Command */
2010                         case '^': /* PM -- Privacy Message */
2011                         case ']': /* OSC -- Operating System Command */
2012                         case 'k': /* old title set compatibility */
2013                                 strreset();
2014                                 strescseq.type = ascii;
2015                                 term.esc |= ESC_STR;
2016                                 break;
2017                         case '(': /* set primary charset G0 */
2018                                 term.esc |= ESC_ALTCHARSET;
2019                                 break;
2020                         case ')': /* set secondary charset G1 (IGNORED) */
2021                         case '*': /* set tertiary charset G2 (IGNORED) */
2022                         case '+': /* set quaternary charset G3 (IGNORED) */
2023                                 term.esc = 0;
2024                                 break;
2025                         case 'D': /* IND -- Linefeed */
2026                                 if(term.c.y == term.bot) {
2027                                         tscrollup(term.top, 1);
2028                                 } else {
2029                                         tmoveto(term.c.x, term.c.y+1);
2030                                 }
2031                                 term.esc = 0;
2032                                 break;
2033                         case 'E': /* NEL -- Next line */
2034                                 tnewline(1); /* always go to first col */
2035                                 term.esc = 0;
2036                                 break;
2037                         case 'H': /* HTS -- Horizontal tab stop */
2038                                 term.tabs[term.c.x] = 1;
2039                                 term.esc = 0;
2040                                 break;
2041                         case 'M': /* RI -- Reverse index */
2042                                 if(term.c.y == term.top) {
2043                                         tscrolldown(term.top, 1);
2044                                 } else {
2045                                         tmoveto(term.c.x, term.c.y-1);
2046                                 }
2047                                 term.esc = 0;
2048                                 break;
2049                         case 'Z': /* DECID -- Identify Terminal */
2050                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
2051                                 term.esc = 0;
2052                                 break;
2053                         case 'c': /* RIS -- Reset to inital state */
2054                                 treset();
2055                                 term.esc = 0;
2056                                 xresettitle();
2057                                 break;
2058                         case '=': /* DECPAM -- Application keypad */
2059                                 term.mode |= MODE_APPKEYPAD;
2060                                 term.esc = 0;
2061                                 break;
2062                         case '>': /* DECPNM -- Normal keypad */
2063                                 term.mode &= ~MODE_APPKEYPAD;
2064                                 term.esc = 0;
2065                                 break;
2066                         case '7': /* DECSC -- Save Cursor */
2067                                 tcursor(CURSOR_SAVE);
2068                                 term.esc = 0;
2069                                 break;
2070                         case '8': /* DECRC -- Restore Cursor */
2071                                 tcursor(CURSOR_LOAD);
2072                                 term.esc = 0;
2073                                 break;
2074                         case '\\': /* ST -- Stop */
2075                                 term.esc = 0;
2076                                 break;
2077                         default:
2078                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2079                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2080                                 term.esc = 0;
2081                         }
2082                 }
2083                 /*
2084                  * All characters which forms part of a sequence are not
2085                  * printed
2086                  */
2087                 return;
2088         }
2089         /*
2090          * Display control codes only if we are in graphic mode
2091          */
2092         if(control && !(term.c.attr.mode & ATTR_GFX))
2093                 return;
2094         if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
2095                 sel.bx = -1;
2096         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
2097                 tnewline(1); /* always go to first col */
2098         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2099         if(term.c.x+1 < term.col)
2100                 tmoveto(term.c.x+1, term.c.y);
2101         else
2102                 term.c.state |= CURSOR_WRAPNEXT;
2103 }
2104
2105 int
2106 tresize(int col, int row) {
2107         int i, x;
2108         int minrow = MIN(row, term.row);
2109         int mincol = MIN(col, term.col);
2110         int slide = term.c.y - row + 1;
2111         bool *bp;
2112
2113         if(col < 1 || row < 1)
2114                 return 0;
2115
2116         /* free unneeded rows */
2117         i = 0;
2118         if(slide > 0) {
2119                 /* slide screen to keep cursor where we expect it -
2120                  * tscrollup would work here, but we can optimize to
2121                  * memmove because we're freeing the earlier lines */
2122                 for(/* i = 0 */; i < slide; i++) {
2123                         free(term.line[i]);
2124                         free(term.alt[i]);
2125                 }
2126                 memmove(term.line, term.line + slide, row * sizeof(Line));
2127                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2128         }
2129         for(i += row; i < term.row; i++) {
2130                 free(term.line[i]);
2131                 free(term.alt[i]);
2132         }
2133
2134         /* resize to new height */
2135         term.line = xrealloc(term.line, row * sizeof(Line));
2136         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2137         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2138         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2139
2140         /* resize each row to new width, zero-pad if needed */
2141         for(i = 0; i < minrow; i++) {
2142                 term.dirty[i] = 1;
2143                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2144                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2145                 for(x = mincol; x < col; x++) {
2146                         term.line[i][x].state = 0;
2147                         term.alt[i][x].state = 0;
2148                 }
2149         }
2150
2151         /* allocate any new rows */
2152         for(/* i == minrow */; i < row; i++) {
2153                 term.dirty[i] = 1;
2154                 term.line[i] = xcalloc(col, sizeof(Glyph));
2155                 term.alt [i] = xcalloc(col, sizeof(Glyph));
2156         }
2157         if(col > term.col) {
2158                 bp = term.tabs + term.col;
2159
2160                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2161                 while(--bp > term.tabs && !*bp)
2162                         /* nothing */ ;
2163                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2164                         *bp = 1;
2165         }
2166         /* update terminal size */
2167         term.col = col;
2168         term.row = row;
2169         /* reset scrolling region */
2170         tsetscroll(0, row-1);
2171         /* make use of the LIMIT in tmoveto */
2172         tmoveto(term.c.x, term.c.y);
2173
2174         return (slide > 0);
2175 }
2176
2177 void
2178 xresize(int col, int row) {
2179         xw.tw = MAX(1, 2*borderpx + col * xw.cw);
2180         xw.th = MAX(1, 2*borderpx + row * xw.ch);
2181
2182         XftDrawChange(xw.draw, xw.buf);
2183 }
2184
2185 void
2186 xloadcols(void) {
2187         int i, r, g, b;
2188         XRenderColor color = { .alpha = 0 };
2189
2190         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2191         for(i = 0; i < LEN(colorname); i++) {
2192                 if(!colorname[i])
2193                         continue;
2194                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2195                         die("Could not allocate color '%s'\n", colorname[i]);
2196                 }
2197         }
2198
2199         /* load colors [16-255] ; same colors as xterm */
2200         for(i = 16, r = 0; r < 6; r++) {
2201                 for(g = 0; g < 6; g++) {
2202                         for(b = 0; b < 6; b++) {
2203                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
2204                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
2205                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
2206                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i])) {
2207                                         die("Could not allocate color %d\n", i);
2208                                 }
2209                                 i++;
2210                         }
2211                 }
2212         }
2213
2214         for(r = 0; r < 24; r++, i++) {
2215                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
2216                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color,
2217                                         &dc.col[i])) {
2218                         die("Could not allocate color %d\n", i);
2219                 }
2220         }
2221 }
2222
2223 void
2224 xtermclear(int col1, int row1, int col2, int row2) {
2225         XftDrawRect(xw.draw,
2226                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2227                         borderpx + col1 * xw.cw,
2228                         borderpx + row1 * xw.ch,
2229                         (col2-col1+1) * xw.cw,
2230                         (row2-row1+1) * xw.ch);
2231 }
2232
2233 /*
2234  * Absolute coordinates.
2235  */
2236 void
2237 xclear(int x1, int y1, int x2, int y2) {
2238         XftDrawRect(xw.draw,
2239                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2240                         x1, y1, x2-x1, y2-y1);
2241 }
2242
2243 void
2244 xhints(void) {
2245         XClassHint class = {opt_class ? opt_class : termname, termname};
2246         XWMHints wm = {.flags = InputHint, .input = 1};
2247         XSizeHints *sizeh = NULL;
2248
2249         sizeh = XAllocSizeHints();
2250         if(xw.isfixed == False) {
2251                 sizeh->flags = PSize | PResizeInc | PBaseSize;
2252                 sizeh->height = xw.h;
2253                 sizeh->width = xw.w;
2254                 sizeh->height_inc = xw.ch;
2255                 sizeh->width_inc = xw.cw;
2256                 sizeh->base_height = 2*borderpx;
2257                 sizeh->base_width = 2*borderpx;
2258         } else {
2259                 sizeh->flags = PMaxSize | PMinSize;
2260                 sizeh->min_width = sizeh->max_width = xw.fw;
2261                 sizeh->min_height = sizeh->max_height = xw.fh;
2262         }
2263
2264         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
2265         XFree(sizeh);
2266 }
2267
2268 int
2269 xloadfont(Font *f, FcPattern *pattern) {
2270         FcPattern *match;
2271         FcResult result;
2272
2273         match = XftFontMatch(xw.dpy, xw.scr, pattern, &result);
2274         if(!match)
2275                 return 1;
2276         if(!(f->set = XftFontOpenPattern(xw.dpy, match))) {
2277                 FcPatternDestroy(match);
2278                 return 1;
2279         }
2280
2281         f->ascent = f->set->ascent;
2282         f->descent = f->set->descent;
2283         f->lbearing = 0;
2284         f->rbearing = f->set->max_advance_width;
2285
2286         f->height = f->set->height;
2287         f->width = f->lbearing + f->rbearing;
2288
2289         return 0;
2290 }
2291
2292 void
2293 xloadfonts(char *fontstr, int fontsize) {
2294         FcPattern *pattern;
2295         FcResult result;
2296         double fontval;
2297
2298         if(fontstr[0] == '-') {
2299                 pattern = XftXlfdParse(fontstr, False, False);
2300         } else {
2301                 pattern = FcNameParse((FcChar8 *)fontstr);
2302         }
2303
2304         if(!pattern)
2305                 die("st: can't open font %s\n", fontstr);
2306
2307         if(fontsize > 0) {
2308                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2309                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2310                 usedfontsize = fontsize;
2311         } else {
2312                 result = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2313                 if(result == FcResultMatch) {
2314                         usedfontsize = (int)fontval;
2315                 } else {
2316                         /*
2317                          * Default font size is 12, if none given. This is to
2318                          * have a known usedfontsize value.
2319                          */
2320                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2321                         usedfontsize = 12;
2322                 }
2323         }
2324
2325         if(xloadfont(&dc.font, pattern))
2326                 die("st: can't open font %s\n", fontstr);
2327
2328         /* Setting character width and height. */
2329         xw.cw = dc.font.width;
2330         xw.ch = dc.font.height;
2331
2332         FcPatternDel(pattern, FC_WEIGHT);
2333         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2334         if(xloadfont(&dc.bfont, pattern))
2335                 die("st: can't open font %s\n", fontstr);
2336
2337         FcPatternDel(pattern, FC_SLANT);
2338         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2339         if(xloadfont(&dc.ibfont, pattern))
2340                 die("st: can't open font %s\n", fontstr);
2341
2342         FcPatternDel(pattern, FC_WEIGHT);
2343         if(xloadfont(&dc.ifont, pattern))
2344                 die("st: can't open font %s\n", fontstr);
2345
2346         FcPatternDestroy(pattern);
2347 }
2348
2349 void
2350 xzoom(const Arg *arg)
2351 {
2352         xloadfonts(usedfont, usedfontsize + arg->i);
2353         cresize(0, 0);
2354         draw();
2355 }
2356
2357 void
2358 xinit(void) {
2359         XSetWindowAttributes attrs;
2360         Cursor cursor;
2361         Window parent;
2362         int sw, sh, major, minor;
2363
2364         if(!(xw.dpy = XOpenDisplay(NULL)))
2365                 die("Can't open display\n");
2366         xw.scr = XDefaultScreen(xw.dpy);
2367         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
2368
2369         /* font */
2370         usedfont = (opt_font == NULL)? font : opt_font;
2371         xloadfonts(usedfont, 0);
2372
2373         /* colors */
2374         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
2375         xloadcols();
2376
2377         /* adjust fixed window geometry */
2378         if(xw.isfixed) {
2379                 sw = DisplayWidth(xw.dpy, xw.scr);
2380                 sh = DisplayHeight(xw.dpy, xw.scr);
2381                 if(xw.fx < 0)
2382                         xw.fx = sw + xw.fx - xw.fw - 1;
2383                 if(xw.fy < 0)
2384                         xw.fy = sh + xw.fy - xw.fh - 1;
2385
2386                 xw.h = xw.fh;
2387                 xw.w = xw.fw;
2388         } else {
2389                 /* window - default size */
2390                 xw.h = 2*borderpx + term.row * xw.ch;
2391                 xw.w = 2*borderpx + term.col * xw.cw;
2392                 xw.fx = 0;
2393                 xw.fy = 0;
2394         }
2395
2396         attrs.background_pixel = dc.col[defaultbg].pixel;
2397         attrs.border_pixel = dc.col[defaultbg].pixel;
2398         attrs.bit_gravity = NorthWestGravity;
2399         attrs.event_mask = FocusChangeMask | KeyPressMask
2400                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
2401                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
2402         attrs.colormap = xw.cmap;
2403
2404         parent = opt_embed ? strtol(opt_embed, NULL, 0) : XRootWindow(xw.dpy, xw.scr);
2405         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
2406                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
2407                         xw.vis,
2408                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
2409                         | CWColormap,
2410                         &attrs);
2411
2412         /* double buffering */
2413         if(!XdbeQueryExtension(xw.dpy, &major, &minor))
2414                 die("Xdbe extension is not present\n");
2415         xw.buf = XdbeAllocateBackBufferName(xw.dpy, xw.win, XdbeCopied);
2416
2417         /* Xft rendering context */
2418         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
2419
2420         /* input methods */
2421         xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
2422         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
2423                                            | XIMStatusNothing, XNClientWindow, xw.win,
2424                                            XNFocusWindow, xw.win, NULL);
2425
2426         /* white cursor, black outline */
2427         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
2428         XDefineCursor(xw.dpy, xw.win, cursor);
2429         XRecolorCursor(xw.dpy, cursor,
2430                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
2431                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
2432
2433         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
2434         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
2435         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
2436
2437         xresettitle();
2438         XMapWindow(xw.dpy, xw.win);
2439         xhints();
2440         XSync(xw.dpy, 0);
2441 }
2442
2443 void
2444 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
2445         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
2446             width = charlen * xw.cw;
2447         Font *font = &dc.font;
2448         XGlyphInfo extents;
2449         Colour *fg = &dc.col[base.fg], *bg = &dc.col[base.bg],
2450                  *temp, revfg, revbg;
2451         XRenderColor colfg, colbg;
2452
2453         if(base.mode & ATTR_BOLD) {
2454                 if(BETWEEN(base.fg, 0, 7)) {
2455                         /* basic system colors */
2456                         fg = &dc.col[base.fg + 8];
2457                 } else if(BETWEEN(base.fg, 16, 195)) {
2458                         /* 256 colors */
2459                         fg = &dc.col[base.fg + 36];
2460                 } else if(BETWEEN(base.fg, 232, 251)) {
2461                         /* greyscale */
2462                         fg = &dc.col[base.fg + 4];
2463                 }
2464                 /*
2465                  * Those ranges will not be brightened:
2466                  *      8 - 15 – bright system colors
2467                  *      196 - 231 – highest 256 color cube
2468                  *      252 - 255 – brightest colors in greyscale
2469                  */
2470                 font = &dc.bfont;
2471         }
2472
2473         if(base.mode & ATTR_ITALIC)
2474                 font = &dc.ifont;
2475         if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD))
2476                 font = &dc.ibfont;
2477
2478         if(IS_SET(MODE_REVERSE)) {
2479                 if(fg == &dc.col[defaultfg]) {
2480                         fg = &dc.col[defaultbg];
2481                 } else {
2482                         colfg.red = ~fg->color.red;
2483                         colfg.green = ~fg->color.green;
2484                         colfg.blue = ~fg->color.blue;
2485                         colfg.alpha = fg->color.alpha;
2486                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
2487                         fg = &revfg;
2488                 }
2489
2490                 if(bg == &dc.col[defaultbg]) {
2491                         bg = &dc.col[defaultfg];
2492                 } else {
2493                         colbg.red = ~bg->color.red;
2494                         colbg.green = ~bg->color.green;
2495                         colbg.blue = ~bg->color.blue;
2496                         colbg.alpha = bg->color.alpha;
2497                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &revbg);
2498                         bg = &revbg;
2499                 }
2500         }
2501
2502         if(base.mode & ATTR_REVERSE)
2503                 temp = fg, fg = bg, bg = temp;
2504
2505         XftTextExtentsUtf8(xw.dpy, font->set, (FcChar8 *)s, bytelen,
2506                         &extents);
2507         width = extents.xOff;
2508
2509         /* Intelligent cleaning up of the borders. */
2510         if(x == 0) {
2511                 xclear(0, (y == 0)? 0 : winy, borderpx,
2512                         winy + xw.ch + (y == term.row-1)? xw.h : 0);
2513         }
2514         if(x + charlen >= term.col-1) {
2515                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
2516                         (y == term.row-1)? xw.h : (winy + xw.ch));
2517         }
2518         if(y == 0)
2519                 xclear(winx, 0, winx + width, borderpx);
2520         if(y == term.row-1)
2521                 xclear(winx, winy + xw.ch, winx + width, xw.h);
2522
2523         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
2524         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
2525                         winy + font->ascent, (FcChar8 *)s, bytelen);
2526
2527         if(base.mode & ATTR_UNDERLINE) {
2528                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
2529                                 width, 1);
2530         }
2531 }
2532
2533 void
2534 xdrawcursor(void) {
2535         static int oldx = 0, oldy = 0;
2536         int sl;
2537         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs, 0};
2538
2539         LIMIT(oldx, 0, term.col-1);
2540         LIMIT(oldy, 0, term.row-1);
2541
2542         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
2543                 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
2544
2545         /* remove the old cursor */
2546         if(term.line[oldy][oldx].state & GLYPH_SET) {
2547                 sl = utf8size(term.line[oldy][oldx].c);
2548                 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
2549                                 oldy, 1, sl);
2550         } else {
2551                 xtermclear(oldx, oldy, oldx, oldy);
2552         }
2553
2554         /* draw the new one */
2555         if(!(IS_SET(MODE_HIDE))) {
2556                 if(!(xw.state & WIN_FOCUSED))
2557                         g.bg = defaultucs;
2558
2559                 if(IS_SET(MODE_REVERSE))
2560                         g.mode |= ATTR_REVERSE, g.fg = defaultcs, g.bg = defaultfg;
2561
2562                 sl = utf8size(g.c);
2563                 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
2564                 oldx = term.c.x, oldy = term.c.y;
2565         }
2566 }
2567
2568 void
2569 xresettitle(void) {
2570         XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
2571 }
2572
2573 void
2574 redraw(void) {
2575         struct timespec tv = {0, REDRAW_TIMEOUT * 1000};
2576
2577         tfulldirt();
2578         draw();
2579         XSync(xw.dpy, False); /* necessary for a good tput flash */
2580         nanosleep(&tv, NULL);
2581 }
2582
2583 void
2584 draw(void) {
2585         XdbeSwapInfo swpinfo[1] = {{xw.win, XdbeCopied}};
2586
2587         drawregion(0, 0, term.col, term.row);
2588         XdbeSwapBuffers(xw.dpy, swpinfo, 1);
2589 }
2590
2591 void
2592 drawregion(int x1, int y1, int x2, int y2) {
2593         int ic, ib, x, y, ox, sl;
2594         Glyph base, new;
2595         char buf[DRAW_BUF_SIZ];
2596         bool ena_sel = sel.bx != -1, alt = IS_SET(MODE_ALTSCREEN) != 0;
2597
2598         if((sel.alt != 0) ^ alt)
2599                 ena_sel = 0;
2600         if(!(xw.state & WIN_VISIBLE))
2601                 return;
2602
2603         for(y = y1; y < y2; y++) {
2604                 if(!term.dirty[y])
2605                         continue;
2606
2607                 xtermclear(0, y, term.col, y);
2608                 term.dirty[y] = 0;
2609                 base = term.line[y][0];
2610                 ic = ib = ox = 0;
2611                 for(x = x1; x < x2; x++) {
2612                         new = term.line[y][x];
2613                         if(ena_sel && *(new.c) && selected(x, y))
2614                                 new.mode ^= ATTR_REVERSE;
2615                         if(ib > 0 && (!(new.state & GLYPH_SET)
2616                                         || ATTRCMP(base, new)
2617                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
2618                                 xdraws(buf, base, ox, y, ic, ib);
2619                                 ic = ib = 0;
2620                         }
2621                         if(new.state & GLYPH_SET) {
2622                                 if(ib == 0) {
2623                                         ox = x;
2624                                         base = new;
2625                                 }
2626                                 sl = utf8size(new.c);
2627                                 memcpy(buf+ib, new.c, sl);
2628                                 ib += sl;
2629                                 ++ic;
2630                         }
2631                 }
2632                 if(ib > 0)
2633                         xdraws(buf, base, ox, y, ic, ib);
2634         }
2635         xdrawcursor();
2636 }
2637
2638 void
2639 expose(XEvent *ev) {
2640         XExposeEvent *e = &ev->xexpose;
2641
2642         if(xw.state & WIN_REDRAW) {
2643                 if(!e->count)
2644                         xw.state &= ~WIN_REDRAW;
2645         }
2646 }
2647
2648 void
2649 visibility(XEvent *ev) {
2650         XVisibilityEvent *e = &ev->xvisibility;
2651
2652         if(e->state == VisibilityFullyObscured) {
2653                 xw.state &= ~WIN_VISIBLE;
2654         } else if(!(xw.state & WIN_VISIBLE)) {
2655                 /* need a full redraw for next Expose, not just a buf copy */
2656                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
2657         }
2658 }
2659
2660 void
2661 unmap(XEvent *ev) {
2662         xw.state &= ~WIN_VISIBLE;
2663 }
2664
2665 void
2666 xseturgency(int add) {
2667         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
2668
2669         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
2670         XSetWMHints(xw.dpy, xw.win, h);
2671         XFree(h);
2672 }
2673
2674 void
2675 focus(XEvent *ev) {
2676         if(ev->type == FocusIn) {
2677                 XSetICFocus(xw.xic);
2678                 xw.state |= WIN_FOCUSED;
2679                 xseturgency(0);
2680         } else {
2681                 XUnsetICFocus(xw.xic);
2682                 xw.state &= ~WIN_FOCUSED;
2683         }
2684 }
2685
2686 char*
2687 kmap(KeySym k, uint state) {
2688         int i;
2689         uint mask;
2690
2691         state &= ~Mod2Mask;
2692         for(i = 0; i < LEN(key); i++) {
2693                 mask = key[i].mask;
2694
2695                 if(key[i].k == k && ((state & mask) == mask
2696                                 || (mask == XK_NO_MOD && !state))) {
2697                         return (char*)key[i].s;
2698                 }
2699         }
2700         return NULL;
2701 }
2702
2703 void
2704 kpress(XEvent *ev) {
2705         XKeyEvent *e = &ev->xkey;
2706         KeySym ksym;
2707         char xstr[31], buf[32], *customkey, *cp = buf;
2708         int len, meta, shift, i;
2709         Status status;
2710
2711         if (IS_SET(MODE_KBDLOCK))
2712                 return;
2713
2714         meta = e->state & Mod1Mask;
2715         shift = e->state & ShiftMask;
2716         len = XmbLookupString(xw.xic, e, xstr, sizeof(xstr), &ksym, &status);
2717
2718         /* 1. shortcuts */
2719         for(i = 0; i < LEN(shortcuts); i++) {
2720                 if((ksym == shortcuts[i].keysym)
2721                                 && (CLEANMASK(shortcuts[i].mod) == \
2722                                         CLEANMASK(e->state))
2723                                 && shortcuts[i].func) {
2724                         shortcuts[i].func(&(shortcuts[i].arg));
2725                 }
2726         }
2727
2728         /* 2. custom keys from config.h */
2729         if((customkey = kmap(ksym, e->state))) {
2730                 len = strlen(customkey);
2731                 memcpy(buf, customkey, len);
2732         /* 2. hardcoded (overrides X lookup) */
2733         } else {
2734                 switch(ksym) {
2735                 case XK_Up:
2736                 case XK_Down:
2737                 case XK_Left:
2738                 case XK_Right:
2739                         /* XXX: shift up/down doesn't work */
2740                         sprintf(buf, "\033%c%c",
2741                                 IS_SET(MODE_APPKEYPAD) ? 'O' : '[',
2742                                 (shift ? "dacb":"DACB")[ksym - XK_Left]);
2743                         len = 3;
2744                         break;
2745                 case XK_Insert:
2746                         if(shift) {
2747                                 selpaste();
2748                                 return;
2749                         }
2750                         memcpy(buf, xstr, len);
2751                         break;
2752                 case XK_Return:
2753                         len = 0;
2754                         if(meta)
2755                                 *cp++ = '\033', len++;
2756
2757                         *cp++ = '\r', len++;
2758
2759                         if(IS_SET(MODE_CRLF))
2760                                 *cp = '\n', len++;
2761                         break;
2762                         /* 3. X lookup  */
2763                 default:
2764                         if(len == 0)
2765                                 return;
2766
2767                         if (len == 1 && meta)
2768                                 *cp++ = '\033';
2769
2770                         memcpy(cp, xstr, len);
2771                         len = cp - buf + len;
2772                         break;
2773                 }
2774         }
2775         ttywrite(buf, len);
2776         if(IS_SET(MODE_ECHO))
2777                 techo(buf, len);
2778 }
2779
2780
2781 void
2782 cmessage(XEvent *e) {
2783         /* See xembed specs
2784            http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html */
2785         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
2786                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
2787                         xw.state |= WIN_FOCUSED;
2788                         xseturgency(0);
2789                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
2790                         xw.state &= ~WIN_FOCUSED;
2791                 }
2792         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
2793                 /* Send SIGHUP to shell */
2794                 kill(pid, SIGHUP);
2795                 exit(EXIT_SUCCESS);
2796         }
2797 }
2798
2799 void
2800 cresize(int width, int height)
2801 {
2802         int col, row;
2803
2804         if(width != 0)
2805                 xw.w = width;
2806         if(height != 0)
2807                 xw.h = height;
2808
2809         col = (xw.w - 2*borderpx) / xw.cw;
2810         row = (xw.h - 2*borderpx) / xw.ch;
2811
2812         tresize(col, row);
2813         xresize(col, row);
2814         ttyresize();
2815 }
2816
2817 void
2818 resize(XEvent *e) {
2819         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
2820                 return;
2821
2822         cresize(e->xconfigure.width, e->xconfigure.height);
2823 }
2824
2825 void
2826 run(void) {
2827         XEvent ev;
2828         fd_set rfd;
2829         int xfd = XConnectionNumber(xw.dpy), i;
2830         struct timeval drawtimeout, *tv = NULL;
2831
2832         for(i = 0;; i++) {
2833                 FD_ZERO(&rfd);
2834                 FD_SET(cmdfd, &rfd);
2835                 FD_SET(xfd, &rfd);
2836                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
2837                         if(errno == EINTR)
2838                                 continue;
2839                         die("select failed: %s\n", SERRNO);
2840                 }
2841
2842                 /*
2843                  * Stop after a certain number of reads so the user does not
2844                  * feel like the system is stuttering.
2845                  */
2846                 if(i < 1000 && FD_ISSET(cmdfd, &rfd)) {
2847                         ttyread();
2848
2849                         /*
2850                          * Just wait a bit so it isn't disturbing the
2851                          * user and the system is able to write something.
2852                          */
2853                         drawtimeout.tv_sec = 0;
2854                         drawtimeout.tv_usec = 5;
2855                         tv = &drawtimeout;
2856                         continue;
2857                 }
2858                 i = 0;
2859                 tv = NULL;
2860
2861                 while(XPending(xw.dpy)) {
2862                         XNextEvent(xw.dpy, &ev);
2863                         if(XFilterEvent(&ev, None))
2864                                 continue;
2865                         if(handler[ev.type])
2866                                 (handler[ev.type])(&ev);
2867                 }
2868
2869                 draw();
2870                 XFlush(xw.dpy);
2871         }
2872 }
2873
2874 int
2875 main(int argc, char *argv[]) {
2876         int i, bitm, xr, yr;
2877         uint wr, hr;
2878
2879         xw.fw = xw.fh = xw.fx = xw.fy = 0;
2880         xw.isfixed = False;
2881
2882         for(i = 1; i < argc; i++) {
2883                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
2884                 case 'c':
2885                         if(++i < argc)
2886                                 opt_class = argv[i];
2887                         break;
2888                 case 'e':
2889                         /* eat every remaining arguments */
2890                         if(++i < argc)
2891                                 opt_cmd = &argv[i];
2892                         goto run;
2893                 case 'f':
2894                         if(++i < argc)
2895                                 opt_font = argv[i];
2896                         break;
2897                 case 'g':
2898                         if(++i >= argc)
2899                                 break;
2900
2901                         bitm = XParseGeometry(argv[i], &xr, &yr, &wr, &hr);
2902                         if(bitm & XValue)
2903                                 xw.fx = xr;
2904                         if(bitm & YValue)
2905                                 xw.fy = yr;
2906                         if(bitm & WidthValue)
2907                                 xw.fw = (int)wr;
2908                         if(bitm & HeightValue)
2909                                 xw.fh = (int)hr;
2910                         if(bitm & XNegative && xw.fx == 0)
2911                                 xw.fx = -1;
2912                         if(bitm & XNegative && xw.fy == 0)
2913                                 xw.fy = -1;
2914
2915                         if(xw.fh != 0 && xw.fw != 0)
2916                                 xw.isfixed = True;
2917                         break;
2918                 case 'o':
2919                         if(++i < argc)
2920                                 opt_io = argv[i];
2921                         break;
2922                 case 't':
2923                         if(++i < argc)
2924                                 opt_title = argv[i];
2925                         break;
2926                 case 'v':
2927                 default:
2928                         die(USAGE);
2929                 case 'w':
2930                         if(++i < argc)
2931                                 opt_embed = argv[i];
2932                         break;
2933                 }
2934         }
2935
2936 run:
2937         setlocale(LC_CTYPE, "");
2938         XSetLocaleModifiers("");
2939         tnew(80, 24);
2940         xinit();
2941         ttynew();
2942         selinit();
2943         run();
2944         return 0;
2945 }
2946