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