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 #define X2COL(x) (((x) - BORDER)/xw.cw)
  76 #define Y2ROW(y) (((y) - BORDER)/xw.ch)
  77
  78 #define VT102ID "\033[?6c"
  79
  80 enum glyph_attribute {
  81         ATTR_NULL      = 0,
  82         ATTR_REVERSE   = 1,
  83         ATTR_UNDERLINE = 2,
  84         ATTR_BOLD      = 4,
  85         ATTR_GFX       = 8,
  86         ATTR_ITALIC    = 16,
  87         ATTR_BLINK     = 32,
  88 };
  89
  90 enum cursor_movement {
  91         CURSOR_UP,
  92         CURSOR_DOWN,
  93         CURSOR_LEFT,
  94         CURSOR_RIGHT,
  95         CURSOR_SAVE,
  96         CURSOR_LOAD
  97 };
  98
  99 enum cursor_state {
 100         CURSOR_DEFAULT  = 0,
 101         CURSOR_HIDE     = 1,
 102         CURSOR_WRAPNEXT = 2
 103 };
 104
 105 enum glyph_state {
 106         GLYPH_SET   = 1,
 107         GLYPH_DIRTY = 2
 108 };
 109
 110 enum term_mode {
 111         MODE_WRAP       = 1,
 112         MODE_INSERT      = 2,
 113         MODE_APPKEYPAD   = 4,
 114         MODE_ALTSCREEN   = 8,
 115         MODE_CRLF       = 16,
 116         MODE_MOUSEBTN    = 32,
 117         MODE_MOUSEMOTION = 64,
 118         MODE_MOUSE       = 32|64,
 119         MODE_REVERSE     = 128,
 120         MODE_KBDLOCK     = 256
 121 };
 122
 123 enum escape_state {
 124         ESC_START      = 1,
 125         ESC_CSI = 2,
 126         ESC_STR = 4, /* DSC, OSC, PM, APC */
 127         ESC_ALTCHARSET = 8,
 128         ESC_STR_END    = 16, /* a final string was encountered */
 129         ESC_TEST       = 32, /* Enter in test mode */
 130 };
 131
 132 enum window_state {
 133         WIN_VISIBLE = 1,
 134         WIN_REDRAW  = 2,
 135         WIN_FOCUSED = 4
 136 };
 137
 138 /* bit macro */
 139 #undef B0
 140 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
 141
 142 typedef unsigned char uchar;
 143 typedef unsigned int uint;
 144 typedef unsigned long ulong;
 145 typedef unsigned short ushort;
 146
 147 typedef struct {
 148         char c[UTF_SIZ];     /* character code */
 149         uchar mode;  /* attribute flags */
 150         ushort fg;   /* foreground  */
 151         ushort bg;   /* background  */
 152         uchar state; /* state flags    */
 153 } Glyph;
 154
 155 typedef Glyph* Line;
 156
 157 typedef struct {
 158         Glyph attr;      /* current char attributes */
 159         int x;
 160         int y;
 161         char state;
 162 } TCursor;
 163
 164 /* CSI Escape sequence structs */
 165 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 166 typedef struct {
 167         char buf[ESC_BUF_SIZ]; /* raw string */
 168         int len;               /* raw string length */
 169         char priv;
 170         int arg[ESC_ARG_SIZ];
 171         int narg;             /* nb of args */
 172         char mode;
 173 } CSIEscape;
 174
 175 /* STR Escape sequence structs */
 176 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 177 typedef struct {
 178         char type;           /* ESC type ... */
 179         char buf[STR_BUF_SIZ]; /* raw string */
 180         int len;               /* raw string length */
 181         char *args[STR_ARG_SIZ];
 182         int narg;             /* nb of args */
 183 } STREscape;
 184
 185 /* Internal representation of the screen */
 186 typedef struct {
 187         int row;        /* nb row */
 188         int col;        /* nb col */
 189         Line *line;     /* screen */
 190         Line *alt;      /* alternate screen */
 191         bool *dirty;    /* dirtyness of lines */
 192         TCursor c;      /* cursor */
 193         int top;        /* top    scroll limit */
 194         int bot;        /* bottom scroll limit */
 195         int mode;       /* terminal mode flags */
 196         int esc;        /* escape state flags */
 197         bool *tabs;
 198 } Term;
 199
 200 /* Purely graphic info */
 201 typedef struct {
 202         Display* dpy;
 203         Colormap cmap;
 204         Window win;
 205         XdbeBackBuffer buf;
 206         Atom xembed, wmdeletewin;
 207         XIM xim;
 208         XIC xic;
 209         XftDraw *xft_draw;
 210         Visual *vis;
 211         int scr;
 212         bool isfixed; /* is fixed geometry? */
 213         int fx, fy, fw, fh; /* fixed geometry */
 214         int tw, th; /* tty width and height */
 215         int w;  /* window width */
 216         int h;  /* window height */
 217         int ch; /* char height */
 218         int cw; /* char width  */
 219         char state; /* focus, redraw, visible */
 220 } XWindow;
 221
 222 typedef struct {
 223         KeySym k;
 224         uint mask;
 225         char s[ESC_BUF_SIZ];
 226 } Key;
 227
 228 /* TODO: use better name for vars... */
 229 typedef struct {
 230         int mode;
 231         int bx, by;
 232         int ex, ey;
 233         struct {
 234                 int x, y;
 235         } b, e;
 236         char *clip;
 237         Atom xtarget;
 238         bool alt;
 239         struct timeval tclick1;
 240         struct timeval tclick2;
 241 } Selection;
 242
 243 typedef union {
 244         int i;
 245         unsigned int ui;
 246         float f;
 247         const void *v;
 248 } Arg;
 249
 250 typedef struct {
 251         unsigned int mod;
 252         KeySym keysym;
 253         void (*func)(const Arg *);
 254         const Arg arg;
 255 } Shortcut;
 256
 257 /* function definitions used in config.h */
 258 static void xzoom(const Arg *);
 259
 260 /* Config.h for applying patches and the configuration. */
 261 #include "config.h"
 262
 263 /* Font structure */
 264 typedef struct {
 265         int height;
 266         int width;
 267         int ascent;
 268         int descent;
 269         short lbearing;
 270         short rbearing;
 271         XftFont *xft_set;
 272 } Font;
 273
 274 /* Drawing Context */
 275 typedef struct {
 276         XftColor xft_col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 277         GC gc;
 278         Font font, bfont, ifont, ibfont;
 279 } DC;
 280
 281 static void die(const char *, ...);
 282 static void draw(void);
 283 static void redraw(void);
 284 static void drawregion(int, int, int, int);
 285 static void execsh(void);
 286 static void sigchld(int);
 287 static void run(void);
 288
 289 static void csidump(void);
 290 static void csihandle(void);
 291 static void csiparse(void);
 292 static void csireset(void);
 293 static void strdump(void);
 294 static void strhandle(void);
 295 static void strparse(void);
 296 static void strreset(void);
 297
 298 static void tclearregion(int, int, int, int);
 299 static void tcursor(int);
 300 static void tdeletechar(int);
 301 static void tdeleteline(int);
 302 static void tinsertblank(int);
 303 static void tinsertblankline(int);
 304 static void tmoveto(int, int);
 305 static void tnew(int, int);
 306 static void tnewline(int);
 307 static void tputtab(bool);
 308 static void tputc(char *, int);
 309 static void treset(void);
 310 static int tresize(int, int);
 311 static void tscrollup(int, int);
 312 static void tscrolldown(int, int);
 313 static void tsetattr(int*, int);
 314 static void tsetchar(char *, Glyph *, int, int);
 315 static void tsetscroll(int, int);
 316 static void tswapscreen(void);
 317 static void tsetdirt(int, int);
 318 static void tsetmode(bool, bool, int *, int);
 319 static void tfulldirt(void);
 320
 321 static void ttynew(void);
 322 static void ttyread(void);
 323 static void ttyresize(void);
 324 static void ttywrite(const char *, size_t);
 325
 326 static void xdraws(char *, Glyph, int, int, int, int);
 327 static void xhints(void);
 328 static void xclear(int, int, int, int);
 329 static void xdrawcursor(void);
 330 static void xinit(void);
 331 static void xloadcols(void);
 332 static void xresettitle(void);
 333 static void xseturgency(int);
 334 static void xsetsel(char*);
 335 static void xtermclear(int, int, int, int);
 336 static void xresize(int, int);
 337
 338 static void expose(XEvent *);
 339 static void visibility(XEvent *);
 340 static void unmap(XEvent *);
 341 static char *kmap(KeySym, uint);
 342 static void kpress(XEvent *);
 343 static void cmessage(XEvent *);
 344 static void cresize(int width, int height);
 345 static void resize(XEvent *);
 346 static void focus(XEvent *);
 347 static void brelease(XEvent *);
 348 static void bpress(XEvent *);
 349 static void bmotion(XEvent *);
 350 static void selnotify(XEvent *);
 351 static void selclear(XEvent *);
 352 static void selrequest(XEvent *);
 353
 354 static void selinit(void);
 355 static inline bool selected(int, int);
 356 static void selcopy(void);
 357 static void selpaste(void);
 358 static void selscroll(int, int);
 359
 360 static int utf8decode(char *, long *);
 361 static int utf8encode(long *, char *);
 362 static int utf8size(char *);
 363 static int isfullutf8(char *, int);
 364
 365 static ssize_t xwrite(int, char *, size_t);
 366 static void *xmalloc(size_t);
 367 static void *xrealloc(void *, size_t);
 368 static void *xcalloc(size_t nmemb, size_t size);
 369
 370 static void (*handler[LASTEvent])(XEvent *) = {
 371         [KeyPress] = kpress,
 372         [ClientMessage] = cmessage,
 373         [ConfigureNotify] = resize,
 374         [VisibilityNotify] = visibility,
 375         [UnmapNotify] = unmap,
 376         [Expose] = expose,
 377         [FocusIn] = focus,
 378         [FocusOut] = focus,
 379         [MotionNotify] = bmotion,
 380         [ButtonPress] = bpress,
 381         [ButtonRelease] = brelease,
 382         [SelectionClear] = selclear,
 383         [SelectionNotify] = selnotify,
 384         [SelectionRequest] = selrequest,
 385 };
 386
 387 /* Globals */
 388 static DC dc;
 389 static XWindow xw;
 390 static Term term;
 391 static CSIEscape csiescseq;
 392 static STREscape strescseq;
 393 static int cmdfd;
 394 static pid_t pid;
 395 static Selection sel;
 396 static int iofd = -1;
 397 static char **opt_cmd = NULL;
 398 static char *opt_io = NULL;
 399 static char *opt_title = NULL;
 400 static char *opt_embed = NULL;
 401 static char *opt_class = NULL;
 402 static char *opt_font = NULL;
 403
 404 static char *usedfont = NULL;
 405 static int usedfontsize = 0;
 406
 407 ssize_t
 408 xwrite(int fd, char *s, size_t len) {
 409         size_t aux = len;
 410
 411         while(len > 0) {
 412                 ssize_t r = write(fd, s, len);
 413                 if(r < 0)
 414                         return r;
 415                 len -= r;
 416                 s += r;
 417         }
 418         return aux;
 419 }
 420
 421 void *
 422 xmalloc(size_t len) {
 423         void *p = malloc(len);
 424
 425         if(!p)
 426                 die("Out of memory\n");
 427
 428         return p;
 429 }
 430
 431 void *
 432 xrealloc(void *p, size_t len) {
 433         if((p = realloc(p, len)) == NULL)
 434                 die("Out of memory\n");
 435
 436         return p;
 437 }
 438
 439 void *
 440 xcalloc(size_t nmemb, size_t size) {
 441         void *p = calloc(nmemb, size);
 442
 443         if(!p)
 444                 die("Out of memory\n");
 445
 446         return p;
 447 }
 448
 449 int
 450 utf8decode(char *s, long *u) {
 451         uchar c;
 452         int i, n, rtn;
 453
 454         rtn = 1;
 455         c = *s;
 456         if(~c & B7) { /* 0xxxxxxx */
 457                 *u = c;
 458                 return rtn;
 459         } else if((c & (B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 460                 *u = c&(B4|B3|B2|B1|B0);
 461                 n = 1;
 462         } else if((c & (B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 463                 *u = c&(B3|B2|B1|B0);
 464                 n = 2;
 465         } else if((c & (B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 466                 *u = c & (B2|B1|B0);
 467                 n = 3;
 468         } else {
 469                 goto invalid;
 470         }
 471
 472         for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
 473                 c = *s;
 474                 if((c & (B7|B6)) != B7) /* 10xxxxxx */
 475                         goto invalid;
 476                 *u <<= 6;
 477                 *u |= c & (B5|B4|B3|B2|B1|B0);
 478         }
 479
 480         if((n == 1 && *u < 0x80) ||
 481            (n == 2 && *u < 0x800) ||
 482            (n == 3 && *u < 0x10000) ||
 483            (*u >= 0xD800 && *u <= 0xDFFF)) {
 484                 goto invalid;
 485         }
 486
 487         return rtn;
 488 invalid:
 489         *u = 0xFFFD;
 490
 491         return rtn;
 492 }
 493
 494 int
 495 utf8encode(long *u, char *s) {
 496         uchar *sp;
 497         ulong uc;
 498         int i, n;
 499
 500         sp = (uchar *)s;
 501         uc = *u;
 502         if(uc < 0x80) {
 503                 *sp = uc; /* 0xxxxxxx */
 504                 return 1;
 505         } else if(*u < 0x800) {
 506                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 507                 n = 1;
 508         } else if(uc < 0x10000) {
 509                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 510                 n = 2;
 511         } else if(uc <= 0x10FFFF) {
 512                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 513                 n = 3;
 514         } else {
 515                 goto invalid;
 516         }
 517
 518         for(i=n,++sp; i>0; --i,++sp)
 519                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 520
 521         return n+1;
 522 invalid:
 523         /* U+FFFD */
 524         *s++ = '\xEF';
 525         *s++ = '\xBF';
 526         *s = '\xBD';
 527
 528         return 3;
 529 }
 530
 531 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 532    UTF-8 otherwise return 0 */
 533 int
 534 isfullutf8(char *s, int b) {
 535         uchar *c1, *c2, *c3;
 536
 537         c1 = (uchar *)s;
 538         c2 = (uchar *)++s;
 539         c3 = (uchar *)++s;
 540         if(b < 1) {
 541                 return 0;
 542         } else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1) {
 543                 return 0;
 544         } else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
 545             ((b == 1) ||
 546             ((b == 2) && (*c2&(B7|B6)) == B7))) {
 547                 return 0;
 548         } else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
 549             ((b == 1) ||
 550             ((b == 2) && (*c2&(B7|B6)) == B7) ||
 551             ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7))) {
 552                 return 0;
 553         } else {
 554                 return 1;
 555         }
 556 }
 557
 558 int
 559 utf8size(char *s) {
 560         uchar c = *s;
 561
 562         if(~c&B7) {
 563                 return 1;
 564         } else if((c&(B7|B6|B5)) == (B7|B6)) {
 565                 return 2;
 566         } else if((c&(B7|B6|B5|B4)) == (B7|B6|B5)) {
 567                 return 3;
 568         } else {
 569                 return 4;
 570         }
 571 }
 572
 573 void
 574 selinit(void) {
 575         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 576         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 577         sel.mode = 0;
 578         sel.bx = -1;
 579         sel.clip = NULL;
 580         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 581         if(sel.xtarget == None)
 582                 sel.xtarget = XA_STRING;
 583 }
 584
 585 static inline bool
 586 selected(int x, int y) {
 587         int bx, ex;
 588
 589         if(sel.ey == y && sel.by == y) {
 590                 bx = MIN(sel.bx, sel.ex);
 591                 ex = MAX(sel.bx, sel.ex);
 592                 return BETWEEN(x, bx, ex);
 593         }
 594
 595         return ((sel.b.y < y && y < sel.e.y)
 596                         || (y == sel.e.y && x <= sel.e.x))
 597                         || (y == sel.b.y && x >= sel.b.x
 598                                 && (x <= sel.e.x || sel.b.y != sel.e.y));
 599 }
 600
 601 void
 602 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 603         if(b)
 604                 *b = e->xbutton.button;
 605
 606         *x = X2COL(e->xbutton.x);
 607         *y = Y2ROW(e->xbutton.y);
 608         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 609         sel.b.y = MIN(sel.by, sel.ey);
 610         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 611         sel.e.y = MAX(sel.by, sel.ey);
 612 }
 613
 614 void
 615 mousereport(XEvent *e) {
 616         int x = X2COL(e->xbutton.x);
 617         int y = Y2ROW(e->xbutton.y);
 618         int button = e->xbutton.button;
 619         int state = e->xbutton.state;
 620         char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
 621         static int ob, ox, oy;
 622
 623         /* from urxvt */
 624         if(e->xbutton.type == MotionNotify) {
 625                 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
 626                         return;
 627                 button = ob + 32;
 628                 ox = x, oy = y;
 629         } else if(e->xbutton.type == ButtonRelease || button == AnyButton) {
 630                 button = 3;
 631         } else {
 632                 button -= Button1;
 633                 if(button >= 3)
 634                         button += 64 - 3;
 635                 if(e->xbutton.type == ButtonPress) {
 636                         ob = button;
 637                         ox = x, oy = y;
 638                 }
 639         }
 640
 641         buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
 642                 + (state & Mod4Mask    ? 8  : 0)
 643                 + (state & ControlMask ? 16 : 0);
 644
 645         ttywrite(buf, sizeof(buf));
 646 }
 647
 648 void
 649 bpress(XEvent *e) {
 650         if(IS_SET(MODE_MOUSE)) {
 651                 mousereport(e);
 652         } else if(e->xbutton.button == Button1) {
 653                 if(sel.bx != -1) {
 654                         sel.bx = -1;
 655                         tsetdirt(sel.b.y, sel.e.y);
 656                         draw();
 657                 }
 658                 sel.mode = 1;
 659                 sel.ex = sel.bx = X2COL(e->xbutton.x);
 660                 sel.ey = sel.by = Y2ROW(e->xbutton.y);
 661         }
 662 }
 663
 664 void
 665 selcopy(void) {
 666         char *str, *ptr;
 667         int x, y, bufsize, is_selected = 0, size;
 668         Glyph *gp;
 669
 670         if(sel.bx == -1) {
 671                 str = NULL;
 672         } else {
 673                 bufsize = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
 674                 ptr = str = xmalloc(bufsize);
 675
 676                 /* append every set & selected glyph to the selection */
 677                 for(y = 0; y < term.row; y++) {
 678                         for(x = 0; x < term.col; x++) {
 679                                 gp = &term.line[y][x];
 680
 681                                 if(!(is_selected = selected(x, y))
 682                                                 || !(gp->state & GLYPH_SET)) {
 683                                         continue;
 684                                 }
 685                                 size = utf8size(gp->c);
 686                                 memcpy(ptr, gp->c, size);
 687                                 ptr += size;
 688                         }
 689                         /* \n at the end of every selected line except for the last one */
 690                         if(is_selected && y < sel.e.y)
 691                                 *ptr++ = '\n';
 692                 }
 693                 *ptr = 0;
 694         }
 695         sel.alt = IS_SET(MODE_ALTSCREEN);
 696         xsetsel(str);
 697 }
 698
 699 void
 700 selnotify(XEvent *e) {
 701         ulong nitems, ofs, rem;
 702         int format;
 703         uchar *data;
 704         Atom type;
 705
 706         ofs = 0;
 707         do {
 708                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 709                                         False, AnyPropertyType, &type, &format,
 710                                         &nitems, &rem, &data)) {
 711                         fprintf(stderr, "Clipboard allocation failed\n");
 712                         return;
 713                 }
 714                 ttywrite((const char *) data, nitems * format / 8);
 715                 XFree(data);
 716                 /* number of 32-bit chunks returned */
 717                 ofs += nitems * format / 32;
 718         } while(rem > 0);
 719 }
 720
 721 void
 722 selpaste(void) {
 723         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
 724                         xw.win, CurrentTime);
 725 }
 726
 727 void selclear(XEvent *e) {
 728         if(sel.bx == -1)
 729                 return;
 730         sel.bx = -1;
 731         tsetdirt(sel.b.y, sel.e.y);
 732 }
 733
 734 void
 735 selrequest(XEvent *e) {
 736         XSelectionRequestEvent *xsre;
 737         XSelectionEvent xev;
 738         Atom xa_targets, string;
 739
 740         xsre = (XSelectionRequestEvent *) e;
 741         xev.type = SelectionNotify;
 742         xev.requestor = xsre->requestor;
 743         xev.selection = xsre->selection;
 744         xev.target = xsre->target;
 745         xev.time = xsre->time;
 746         /* reject */
 747         xev.property = None;
 748
 749         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 750         if(xsre->target == xa_targets) {
 751                 /* respond with the supported type */
 752                 string = sel.xtarget;
 753                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 754                                 XA_ATOM, 32, PropModeReplace,
 755                                 (uchar *) &string, 1);
 756                 xev.property = xsre->property;
 757         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
 758                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 759                                 xsre->target, 8, PropModeReplace,
 760                                 (uchar *) sel.clip, strlen(sel.clip));
 761                 xev.property = xsre->property;
 762         }
 763
 764         /* all done, send a notification to the listener */
 765         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
 766                 fprintf(stderr, "Error sending SelectionNotify event\n");
 767 }
 768
 769 void
 770 xsetsel(char *str) {
 771         /* register the selection for both the clipboard and the primary */
 772         Atom clipboard;
 773
 774         free(sel.clip);
 775         sel.clip = str;
 776
 777         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
 778
 779         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 780         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 781 }
 782
 783 void
 784 brelease(XEvent *e) {
 785         struct timeval now;
 786
 787         if(IS_SET(MODE_MOUSE)) {
 788                 mousereport(e);
 789                 return;
 790         }
 791
 792         if(e->xbutton.button == Button2) {
 793                 selpaste();
 794         } else if(e->xbutton.button == Button1) {
 795                 sel.mode = 0;
 796                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 797                 term.dirty[sel.ey] = 1;
 798                 if(sel.bx == sel.ex && sel.by == sel.ey) {
 799                         sel.bx = -1;
 800                         gettimeofday(&now, NULL);
 801
 802                         if(TIMEDIFF(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
 803                                 /* triple click on the line */
 804                                 sel.b.x = sel.bx = 0;
 805                                 sel.e.x = sel.ex = term.col;
 806                                 sel.b.y = sel.e.y = sel.ey;
 807                                 selcopy();
 808                         } else if(TIMEDIFF(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
 809                                 /* double click to select word */
 810                                 sel.bx = sel.ex;
 811                                 while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
 812                                                 term.line[sel.ey][sel.bx-1].c[0] != ' ') {
 813                                         sel.bx--;
 814                                 }
 815                                 sel.b.x = sel.bx;
 816                                 while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
 817                                                 term.line[sel.ey][sel.ex+1].c[0] != ' ') {
 818                                         sel.ex++;
 819                                 }
 820                                 sel.e.x = sel.ex;
 821                                 sel.b.y = sel.e.y = sel.ey;
 822                                 selcopy();
 823                         }
 824                 } else {
 825                         selcopy();
 826                 }
 827         }
 828
 829         memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
 830         gettimeofday(&sel.tclick1, NULL);
 831 }
 832
 833 void
 834 bmotion(XEvent *e) {
 835         int starty, endy, oldey, oldex;
 836
 837         if(IS_SET(MODE_MOUSE)) {
 838                 mousereport(e);
 839                 return;
 840         }
 841
 842         if(sel.mode) {
 843                 oldey = sel.ey;
 844                 oldex = sel.ex;
 845                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 846
 847                 if(oldey != sel.ey || oldex != sel.ex) {
 848                         starty = MIN(oldey, sel.ey);
 849                         endy = MAX(oldey, sel.ey);
 850                         tsetdirt(starty, endy);
 851                 }
 852         }
 853 }
 854
 855 void
 856 die(const char *errstr, ...) {
 857         va_list ap;
 858
 859         va_start(ap, errstr);
 860         vfprintf(stderr, errstr, ap);
 861         va_end(ap);
 862         exit(EXIT_FAILURE);
 863 }
 864
 865 void
 866 execsh(void) {
 867         char **args;
 868         char *envshell = getenv("SHELL");
 869         const struct passwd *pass = getpwuid(getuid());
 870         char buf[sizeof(long) * 8 + 1];
 871
 872         unsetenv("COLUMNS");
 873         unsetenv("LINES");
 874         unsetenv("TERMCAP");
 875
 876         if(pass) {
 877                 setenv("LOGNAME", pass->pw_name, 1);
 878                 setenv("USER", pass->pw_name, 1);
 879                 setenv("SHELL", pass->pw_shell, 0);
 880                 setenv("HOME", pass->pw_dir, 0);
 881         }
 882
 883         snprintf(buf, sizeof(buf), "%lu", xw.win);
 884         setenv("WINDOWID", buf, 1);
 885
 886         signal(SIGCHLD, SIG_DFL);
 887         signal(SIGHUP, SIG_DFL);
 888         signal(SIGINT, SIG_DFL);
 889         signal(SIGQUIT, SIG_DFL);
 890         signal(SIGTERM, SIG_DFL);
 891         signal(SIGALRM, SIG_DFL);
 892
 893         DEFAULT(envshell, SHELL);
 894         putenv("TERM="TNAME);
 895         args = opt_cmd ? opt_cmd : (char *[]){envshell, "-i", NULL};
 896         execvp(args[0], args);
 897         exit(EXIT_FAILURE);
 898 }
 899
 900 void
 901 sigchld(int a) {
 902         int stat = 0;
 903
 904         if(waitpid(pid, &stat, 0) < 0)
 905                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 906
 907         if(WIFEXITED(stat)) {
 908                 exit(WEXITSTATUS(stat));
 909         } else {
 910                 exit(EXIT_FAILURE);
 911         }
 912 }
 913
 914 void
 915 ttynew(void) {
 916         int m, s;
 917         struct winsize w = {term.row, term.col, 0, 0};
 918
 919         /* seems to work fine on linux, openbsd and freebsd */
 920         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 921                 die("openpty failed: %s\n", SERRNO);
 922
 923         switch(pid = fork()) {
 924         case -1:
 925                 die("fork failed\n");
 926                 break;
 927         case 0:
 928                 setsid(); /* create a new process group */
 929                 dup2(s, STDIN_FILENO);
 930                 dup2(s, STDOUT_FILENO);
 931                 dup2(s, STDERR_FILENO);
 932                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 933                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 934                 close(s);
 935                 close(m);
 936                 execsh();
 937                 break;
 938         default:
 939                 close(s);
 940                 cmdfd = m;
 941                 signal(SIGCHLD, sigchld);
 942                 if(opt_io) {
 943                         iofd = (!strcmp(opt_io, "-")) ?
 944                                   STDOUT_FILENO :
 945                                   open(opt_io, O_WRONLY | O_CREAT, 0666);
 946                         if(iofd < 0) {
 947                                 fprintf(stderr, "Error opening %s:%s\n",
 948                                         opt_io, strerror(errno));
 949                         }
 950                 }
 951         }
 952 }
 953
 954 void
 955 dump(char c) {
 956         static int col;
 957
 958         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 959         if(++col % 10 == 0)
 960                 fprintf(stderr, "\n");
 961 }
 962
 963 void
 964 ttyread(void) {
 965         static char buf[BUFSIZ];
 966         static int buflen = 0;
 967         char *ptr;
 968         char s[UTF_SIZ];
 969         int charsize; /* size of utf8 char in bytes */
 970         long utf8c;
 971         int ret;
 972
 973         /* append read bytes to unprocessed bytes */
 974         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
 975                 die("Couldn't read from shell: %s\n", SERRNO);
 976
 977         /* process every complete utf8 char */
 978         buflen += ret;
 979         ptr = buf;
 980         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
 981                 charsize = utf8decode(ptr, &utf8c);
 982                 utf8encode(&utf8c, s);
 983                 tputc(s, charsize);
 984                 ptr += charsize;
 985                 buflen -= charsize;
 986         }
 987
 988         /* keep any uncomplete utf8 char for the next call */
 989         memmove(buf, ptr, buflen);
 990 }
 991
 992 void
 993 ttywrite(const char *s, size_t n) {
 994         if(write(cmdfd, s, n) == -1)
 995                 die("write error on tty: %s\n", SERRNO);
 996 }
 997
 998 void
 999 ttyresize(void) {
1000         struct winsize w;
1001
1002         w.ws_row = term.row;
1003         w.ws_col = term.col;
1004         w.ws_xpixel = xw.tw;
1005         w.ws_ypixel = xw.th;
1006         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1007                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
1008 }
1009
1010 void
1011 tsetdirt(int top, int bot) {
1012         int i;
1013
1014         LIMIT(top, 0, term.row-1);
1015         LIMIT(bot, 0, term.row-1);
1016
1017         for(i = top; i <= bot; i++)
1018                 term.dirty[i] = 1;
1019 }
1020
1021 void
1022 tfulldirt(void) {
1023         tsetdirt(0, term.row-1);
1024 }
1025
1026 void
1027 tcursor(int mode) {
1028         static TCursor c;
1029
1030         if(mode == CURSOR_SAVE) {
1031                 c = term.c;
1032         } else if(mode == CURSOR_LOAD) {
1033                 term.c = c;
1034                 tmoveto(c.x, c.y);
1035         }
1036 }
1037
1038 void
1039 treset(void) {
1040         uint i;
1041
1042         term.c = (TCursor){{
1043                 .mode = ATTR_NULL,
1044                 .fg = DefaultFG,
1045                 .bg = DefaultBG
1046         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1047
1048         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1049         for(i = TAB; i < term.col; i += TAB)
1050                 term.tabs[i] = 1;
1051         term.top = 0;
1052         term.bot = term.row - 1;
1053         term.mode = MODE_WRAP;
1054
1055         tclearregion(0, 0, term.col-1, term.row-1);
1056 }
1057
1058 void
1059 tnew(int col, int row) {
1060         /* set screen size */
1061         term.row = row;
1062         term.col = col;
1063         term.line = xmalloc(term.row * sizeof(Line));
1064         term.alt  = xmalloc(term.row * sizeof(Line));
1065         term.dirty = xmalloc(term.row * sizeof(*term.dirty));
1066         term.tabs = xmalloc(term.col * sizeof(*term.tabs));
1067
1068         for(row = 0; row < term.row; row++) {
1069                 term.line[row] = xmalloc(term.col * sizeof(Glyph));
1070                 term.alt [row] = xmalloc(term.col * sizeof(Glyph));
1071                 term.dirty[row] = 0;
1072         }
1073         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1074         /* setup screen */
1075         treset();
1076 }
1077
1078 void
1079 tswapscreen(void) {
1080         Line *tmp = term.line;
1081
1082         term.line = term.alt;
1083         term.alt = tmp;
1084         term.mode ^= MODE_ALTSCREEN;
1085         tfulldirt();
1086 }
1087
1088 void
1089 tscrolldown(int orig, int n) {
1090         int i;
1091         Line temp;
1092
1093         LIMIT(n, 0, term.bot-orig+1);
1094
1095         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1096
1097         for(i = term.bot; i >= orig+n; i--) {
1098                 temp = term.line[i];
1099                 term.line[i] = term.line[i-n];
1100                 term.line[i-n] = temp;
1101
1102                 term.dirty[i] = 1;
1103                 term.dirty[i-n] = 1;
1104         }
1105
1106         selscroll(orig, n);
1107 }
1108
1109 void
1110 tscrollup(int orig, int n) {
1111         int i;
1112         Line temp;
1113         LIMIT(n, 0, term.bot-orig+1);
1114
1115         tclearregion(0, orig, term.col-1, orig+n-1);
1116
1117         for(i = orig; i <= term.bot-n; i++) {
1118                  temp = term.line[i];
1119                  term.line[i] = term.line[i+n];
1120                  term.line[i+n] = temp;
1121
1122                  term.dirty[i] = 1;
1123                  term.dirty[i+n] = 1;
1124         }
1125
1126         selscroll(orig, -n);
1127 }
1128
1129 void
1130 selscroll(int orig, int n) {
1131         if(sel.bx == -1)
1132                 return;
1133
1134         if(BETWEEN(sel.by, orig, term.bot) || BETWEEN(sel.ey, orig, term.bot)) {
1135                 if((sel.by += n) > term.bot || (sel.ey += n) < term.top) {
1136                         sel.bx = -1;
1137                         return;
1138                 }
1139                 if(sel.by < term.top) {
1140                         sel.by = term.top;
1141                         sel.bx = 0;
1142                 }
1143                 if(sel.ey > term.bot) {
1144                         sel.ey = term.bot;
1145                         sel.ex = term.col;
1146                 }
1147                 sel.b.y = sel.by, sel.b.x = sel.bx;
1148                 sel.e.y = sel.ey, sel.e.x = sel.ex;
1149         }
1150 }
1151
1152 void
1153 tnewline(int first_col) {
1154         int y = term.c.y;
1155
1156         if(y == term.bot) {
1157                 tscrollup(term.top, 1);
1158         } else {
1159                 y++;
1160         }
1161         tmoveto(first_col ? 0 : term.c.x, y);
1162 }
1163
1164 void
1165 csiparse(void) {
1166         /* int noarg = 1; */
1167         char *p = csiescseq.buf;
1168
1169         csiescseq.narg = 0;
1170         if(*p == '?')
1171                 csiescseq.priv = 1, p++;
1172
1173         while(p < csiescseq.buf+csiescseq.len) {
1174                 while(isdigit(*p)) {
1175                         csiescseq.arg[csiescseq.narg] *= 10;
1176                         csiescseq.arg[csiescseq.narg] += *p++ - '0'/*, noarg = 0 */;
1177                 }
1178                 if(*p == ';' && csiescseq.narg+1 < ESC_ARG_SIZ) {
1179                         csiescseq.narg++, p++;
1180                 } else {
1181                         csiescseq.mode = *p;
1182                         csiescseq.narg++;
1183
1184                         return;
1185                 }
1186         }
1187 }
1188
1189 void
1190 tmoveto(int x, int y) {
1191         LIMIT(x, 0, term.col-1);
1192         LIMIT(y, 0, term.row-1);
1193         term.c.state &= ~CURSOR_WRAPNEXT;
1194         term.c.x = x;
1195         term.c.y = y;
1196 }
1197
1198 void
1199 tsetchar(char *c, Glyph *attr, int x, int y) {
1200         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1201                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1202                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1203                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1204                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1205                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1206                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1207                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1208                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1209         };
1210
1211         /*
1212          * The table is proudly stolen from rxvt.
1213          */
1214         if(attr->mode & ATTR_GFX) {
1215                 if(c[0] >= 0x41 && c[0] <= 0x7e
1216                                 && vt100_0[c[0] - 0x41]) {
1217                         c = vt100_0[c[0] - 0x41];
1218                 }
1219         }
1220
1221         term.dirty[y] = 1;
1222         term.line[y][x] = *attr;
1223         memcpy(term.line[y][x].c, c, UTF_SIZ);
1224         term.line[y][x].state |= GLYPH_SET;
1225 }
1226
1227 void
1228 tclearregion(int x1, int y1, int x2, int y2) {
1229         int x, y, temp;
1230
1231         if(x1 > x2)
1232                 temp = x1, x1 = x2, x2 = temp;
1233         if(y1 > y2)
1234                 temp = y1, y1 = y2, y2 = temp;
1235
1236         LIMIT(x1, 0, term.col-1);
1237         LIMIT(x2, 0, term.col-1);
1238         LIMIT(y1, 0, term.row-1);
1239         LIMIT(y2, 0, term.row-1);
1240
1241         for(y = y1; y <= y2; y++) {
1242                 term.dirty[y] = 1;
1243                 for(x = x1; x <= x2; x++)
1244                         term.line[y][x].state = 0;
1245         }
1246 }
1247
1248 void
1249 tdeletechar(int n) {
1250         int src = term.c.x + n;
1251         int dst = term.c.x;
1252         int size = term.col - src;
1253
1254         term.dirty[term.c.y] = 1;
1255
1256         if(src >= term.col) {
1257                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1258                 return;
1259         }
1260
1261         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1262                         size * sizeof(Glyph));
1263         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1264 }
1265
1266 void
1267 tinsertblank(int n) {
1268         int src = term.c.x;
1269         int dst = src + n;
1270         int size = term.col - dst;
1271
1272         term.dirty[term.c.y] = 1;
1273
1274         if(dst >= term.col) {
1275                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1276                 return;
1277         }
1278
1279         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src],
1280                         size * sizeof(Glyph));
1281         tclearregion(src, term.c.y, dst - 1, term.c.y);
1282 }
1283
1284 void
1285 tinsertblankline(int n) {
1286         if(term.c.y < term.top || term.c.y > term.bot)
1287                 return;
1288
1289         tscrolldown(term.c.y, n);
1290 }
1291
1292 void
1293 tdeleteline(int n) {
1294         if(term.c.y < term.top || term.c.y > term.bot)
1295                 return;
1296
1297         tscrollup(term.c.y, n);
1298 }
1299
1300 void
1301 tsetattr(int *attr, int l) {
1302         int i;
1303
1304         for(i = 0; i < l; i++) {
1305                 switch(attr[i]) {
1306                 case 0:
1307                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD \
1308                                         | ATTR_ITALIC | ATTR_BLINK);
1309                         term.c.attr.fg = DefaultFG;
1310                         term.c.attr.bg = DefaultBG;
1311                         break;
1312                 case 1:
1313                         term.c.attr.mode |= ATTR_BOLD;
1314                         break;
1315                 case 3: /* enter standout (highlight) */
1316                         term.c.attr.mode |= ATTR_ITALIC;
1317                         break;
1318                 case 4:
1319                         term.c.attr.mode |= ATTR_UNDERLINE;
1320                         break;
1321                 case 5:
1322                         term.c.attr.mode |= ATTR_BLINK;
1323                         break;
1324                 case 7:
1325                         term.c.attr.mode |= ATTR_REVERSE;
1326                         break;
1327                 case 21:
1328                 case 22:
1329                         term.c.attr.mode &= ~ATTR_BOLD;
1330                         break;
1331                 case 23: /* leave standout (highlight) mode */
1332                         term.c.attr.mode &= ~ATTR_ITALIC;
1333                         break;
1334                 case 24:
1335                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1336                         break;
1337                 case 25:
1338                         term.c.attr.mode &= ~ATTR_BLINK;
1339                         break;
1340                 case 27:
1341                         term.c.attr.mode &= ~ATTR_REVERSE;
1342                         break;
1343                 case 38:
1344                         if(i + 2 < l && attr[i + 1] == 5) {
1345                                 i += 2;
1346                                 if(BETWEEN(attr[i], 0, 255)) {
1347                                         term.c.attr.fg = attr[i];
1348                                 } else {
1349                                         fprintf(stderr,
1350                                                 "erresc: bad fgcolor %d\n",
1351                                                 attr[i]);
1352                                 }
1353                         } else {
1354                                 fprintf(stderr,
1355                                         "erresc(38): gfx attr %d unknown\n",
1356                                         attr[i]);
1357                         }
1358                         break;
1359                 case 39:
1360                         term.c.attr.fg = DefaultFG;
1361                         break;
1362                 case 48:
1363                         if(i + 2 < l && attr[i + 1] == 5) {
1364                                 i += 2;
1365                                 if(BETWEEN(attr[i], 0, 255)) {
1366                                         term.c.attr.bg = attr[i];
1367                                 } else {
1368                                         fprintf(stderr,
1369                                                 "erresc: bad bgcolor %d\n",
1370                                                 attr[i]);
1371                                 }
1372                         } else {
1373                                 fprintf(stderr,
1374                                         "erresc(48): gfx attr %d unknown\n",
1375                                         attr[i]);
1376                         }
1377                         break;
1378                 case 49:
1379                         term.c.attr.bg = DefaultBG;
1380                         break;
1381                 default:
1382                         if(BETWEEN(attr[i], 30, 37)) {
1383                                 term.c.attr.fg = attr[i] - 30;
1384                         } else if(BETWEEN(attr[i], 40, 47)) {
1385                                 term.c.attr.bg = attr[i] - 40;
1386                         } else if(BETWEEN(attr[i], 90, 97)) {
1387                                 term.c.attr.fg = attr[i] - 90 + 8;
1388                         } else if(BETWEEN(attr[i], 100, 107)) {
1389                                 term.c.attr.bg = attr[i] - 100 + 8;
1390                         } else {
1391                                 fprintf(stderr,
1392                                         "erresc(default): gfx attr %d unknown\n",
1393                                         attr[i]), csidump();
1394                         }
1395                         break;
1396                 }
1397         }
1398 }
1399
1400 void
1401 tsetscroll(int t, int b) {
1402         int temp;
1403
1404         LIMIT(t, 0, term.row-1);
1405         LIMIT(b, 0, term.row-1);
1406         if(t > b) {
1407                 temp = t;
1408                 t = b;
1409                 b = temp;
1410         }
1411         term.top = t;
1412         term.bot = b;
1413 }
1414
1415 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1416
1417 void
1418 tsetmode(bool priv, bool set, int *args, int narg) {
1419         int *lim, mode;
1420
1421         for(lim = args + narg; args < lim; ++args) {
1422                 if(priv) {
1423                         switch(*args) {
1424                                 break;
1425                         case 1: /* DECCKM -- Cursor key */
1426                                 MODBIT(term.mode, set, MODE_APPKEYPAD);
1427                                 break;
1428                         case 5: /* DECSCNM -- Reverse video */
1429                                 mode = term.mode;
1430                                 MODBIT(term.mode, set, MODE_REVERSE);
1431                                 if(mode != term.mode)
1432                                         redraw();
1433                                 break;
1434                         case 6: /* XXX: DECOM -- Origin */
1435                                 break;
1436                         case 7: /* DECAWM -- Auto wrap */
1437                                 MODBIT(term.mode, set, MODE_WRAP);
1438                                 break;
1439                         case 8: /* XXX: DECARM -- Auto repeat */
1440                                 break;
1441                         case 0:  /* Error (IGNORED) */
1442                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1443                                 break;
1444                         case 25:
1445                                 MODBIT(term.c.state, !set, CURSOR_HIDE);
1446                                 break;
1447                         case 1000: /* 1000,1002: enable xterm mouse report */
1448                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1449                                 break;
1450                         case 1002:
1451                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1452                                 break;
1453                         case 1049: /* = 1047 and 1048 */
1454                         case 47:
1455                         case 1047:
1456                                 if(IS_SET(MODE_ALTSCREEN))
1457                                         tclearregion(0, 0, term.col-1, term.row-1);
1458                                 if((set && !IS_SET(MODE_ALTSCREEN)) ||
1459                                                 (!set && IS_SET(MODE_ALTSCREEN))) {
1460                                         tswapscreen();
1461                                 }
1462                                 if(*args != 1049)
1463                                         break;
1464                                 /* pass through */
1465                         case 1048:
1466                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1467                                 break;
1468                         default:
1469                         /* case 2:  DECANM -- ANSI/VT52 (NOT SUPPOURTED) */
1470                         /* case 3:  DECCOLM -- Column  (NOT SUPPORTED) */
1471                         /* case 4:  DECSCLM -- Scroll (NOT SUPPORTED) */
1472                         /* case 18: DECPFF -- Printer feed (NOT SUPPORTED) */
1473                         /* case 19: DECPEX -- Printer extent (NOT SUPPORTED) */
1474                         /* case 42: DECNRCM -- National characters (NOT SUPPORTED) */
1475                                 fprintf(stderr,
1476                                         "erresc: unknown private set/reset mode %d\n",
1477                                         *args);
1478                                 break;
1479                         }
1480                 } else {
1481                         switch(*args) {
1482                         case 0:  /* Error (IGNORED) */
1483                                 break;
1484                         case 2:  /* KAM -- keyboard action */
1485                                 MODBIT(term.mode, set, MODE_KBDLOCK);
1486                                 break;
1487                         case 4:  /* IRM -- Insertion-replacement */
1488                                 MODBIT(term.mode, set, MODE_INSERT);
1489                                 break;
1490                         case 12: /* XXX: SRM -- Send/Receive */
1491                                 break;
1492                         case 20: /* LNM -- Linefeed/new line */
1493                                 MODBIT(term.mode, set, MODE_CRLF);
1494                                 break;
1495                         default:
1496                                 fprintf(stderr,
1497                                         "erresc: unknown set/reset mode %d\n",
1498                                         *args);
1499                                 break;
1500                         }
1501                 }
1502         }
1503 }
1504 #undef MODBIT
1505
1506
1507 void
1508 csihandle(void) {
1509         switch(csiescseq.mode) {
1510         default:
1511         unknown:
1512                 fprintf(stderr, "erresc: unknown csi ");
1513                 csidump();
1514                 /* die(""); */
1515                 break;
1516         case '@': /* ICH -- Insert <n> blank char */
1517                 DEFAULT(csiescseq.arg[0], 1);
1518                 tinsertblank(csiescseq.arg[0]);
1519                 break;
1520         case 'A': /* CUU -- Cursor <n> Up */
1521         case 'e':
1522                 DEFAULT(csiescseq.arg[0], 1);
1523                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1524                 break;
1525         case 'B': /* CUD -- Cursor <n> Down */
1526                 DEFAULT(csiescseq.arg[0], 1);
1527                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1528                 break;
1529         case 'c': /* DA -- Device Attributes */
1530                 if(csiescseq.arg[0] == 0)
1531                         ttywrite(VT102ID, sizeof(VT102ID) - 1);
1532                 break;
1533         case 'C': /* CUF -- Cursor <n> Forward */
1534         case 'a':
1535                 DEFAULT(csiescseq.arg[0], 1);
1536                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1537                 break;
1538         case 'D': /* CUB -- Cursor <n> Backward */
1539                 DEFAULT(csiescseq.arg[0], 1);
1540                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1541                 break;
1542         case 'E': /* CNL -- Cursor <n> Down and first col */
1543                 DEFAULT(csiescseq.arg[0], 1);
1544                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1545                 break;
1546         case 'F': /* CPL -- Cursor <n> Up and first col */
1547                 DEFAULT(csiescseq.arg[0], 1);
1548                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1549                 break;
1550         case 'g': /* TBC -- Tabulation clear */
1551                 switch (csiescseq.arg[0]) {
1552                 case 0: /* clear current tab stop */
1553                         term.tabs[term.c.x] = 0;
1554                         break;
1555                 case 3: /* clear all the tabs */
1556                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1557                         break;
1558                 default:
1559                         goto unknown;
1560                 }
1561                 break;
1562         case 'G': /* CHA -- Move to <col> */
1563         case '`': /* HPA */
1564                 DEFAULT(csiescseq.arg[0], 1);
1565                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1566                 break;
1567         case 'H': /* CUP -- Move to <row> <col> */
1568         case 'f': /* HVP */
1569                 DEFAULT(csiescseq.arg[0], 1);
1570                 DEFAULT(csiescseq.arg[1], 1);
1571                 tmoveto(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1572                 break;
1573         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1574                 DEFAULT(csiescseq.arg[0], 1);
1575                 while(csiescseq.arg[0]--)
1576                         tputtab(1);
1577                 break;
1578         case 'J': /* ED -- Clear screen */
1579                 sel.bx = -1;
1580                 switch(csiescseq.arg[0]) {
1581                 case 0: /* below */
1582                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1583                         if(term.c.y < term.row-1)
1584                                 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1585                         break;
1586                 case 1: /* above */
1587                         if(term.c.y > 1)
1588                                 tclearregion(0, 0, term.col-1, term.c.y-1);
1589                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1590                         break;
1591                 case 2: /* all */
1592                         tclearregion(0, 0, term.col-1, term.row-1);
1593                         break;
1594                 default:
1595                         goto unknown;
1596                 }
1597                 break;
1598         case 'K': /* EL -- Clear line */
1599                 switch(csiescseq.arg[0]) {
1600                 case 0: /* right */
1601                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1602                         break;
1603                 case 1: /* left */
1604                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1605                         break;
1606                 case 2: /* all */
1607                         tclearregion(0, term.c.y, term.col-1, term.c.y);
1608                         break;
1609                 }
1610                 break;
1611         case 'S': /* SU -- Scroll <n> line up */
1612                 DEFAULT(csiescseq.arg[0], 1);
1613                 tscrollup(term.top, csiescseq.arg[0]);
1614                 break;
1615         case 'T': /* SD -- Scroll <n> line down */
1616                 DEFAULT(csiescseq.arg[0], 1);
1617                 tscrolldown(term.top, csiescseq.arg[0]);
1618                 break;
1619         case 'L': /* IL -- Insert <n> blank lines */
1620                 DEFAULT(csiescseq.arg[0], 1);
1621                 tinsertblankline(csiescseq.arg[0]);
1622                 break;
1623         case 'l': /* RM -- Reset Mode */
1624                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
1625                 break;
1626         case 'M': /* DL -- Delete <n> lines */
1627                 DEFAULT(csiescseq.arg[0], 1);
1628                 tdeleteline(csiescseq.arg[0]);
1629                 break;
1630         case 'X': /* ECH -- Erase <n> char */
1631                 DEFAULT(csiescseq.arg[0], 1);
1632                 tclearregion(term.c.x, term.c.y, term.c.x + csiescseq.arg[0], term.c.y);
1633                 break;
1634         case 'P': /* DCH -- Delete <n> char */
1635                 DEFAULT(csiescseq.arg[0], 1);
1636                 tdeletechar(csiescseq.arg[0]);
1637                 break;
1638         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1639                 DEFAULT(csiescseq.arg[0], 1);
1640                 while(csiescseq.arg[0]--)
1641                         tputtab(0);
1642                 break;
1643         case 'd': /* VPA -- Move to <row> */
1644                 DEFAULT(csiescseq.arg[0], 1);
1645                 tmoveto(term.c.x, csiescseq.arg[0]-1);
1646                 break;
1647         case 'h': /* SM -- Set terminal mode */
1648                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
1649                 break;
1650         case 'm': /* SGR -- Terminal attribute (color) */
1651                 tsetattr(csiescseq.arg, csiescseq.narg);
1652                 break;
1653         case 'r': /* DECSTBM -- Set Scrolling Region */
1654                 if(csiescseq.priv) {
1655                         goto unknown;
1656                 } else {
1657                         DEFAULT(csiescseq.arg[0], 1);
1658                         DEFAULT(csiescseq.arg[1], term.row);
1659                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
1660                         tmoveto(0, 0);
1661                 }
1662                 break;
1663         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1664                 tcursor(CURSOR_SAVE);
1665                 break;
1666         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1667                 tcursor(CURSOR_LOAD);
1668                 break;
1669         }
1670 }
1671
1672 void
1673 csidump(void) {
1674         int i;
1675         uint c;
1676
1677         printf("ESC[");
1678         for(i = 0; i < csiescseq.len; i++) {
1679                 c = csiescseq.buf[i] & 0xff;
1680                 if(isprint(c)) {
1681                         putchar(c);
1682                 } else if(c == '\n') {
1683                         printf("(\\n)");
1684                 } else if(c == '\r') {
1685                         printf("(\\r)");
1686                 } else if(c == 0x1b) {
1687                         printf("(\\e)");
1688                 } else {
1689                         printf("(%02x)", c);
1690                 }
1691         }
1692         putchar('\n');
1693 }
1694
1695 void
1696 csireset(void) {
1697         memset(&csiescseq, 0, sizeof(csiescseq));
1698 }
1699
1700 void
1701 strhandle(void) {
1702         char *p;
1703
1704         /*
1705          * TODO: make this being useful in case of color palette change.
1706          */
1707         strparse();
1708
1709         p = strescseq.buf;
1710
1711         switch(strescseq.type) {
1712         case ']': /* OSC -- Operating System Command */
1713                 switch(p[0]) {
1714                 case '0':
1715                 case '1':
1716                 case '2':
1717                         /*
1718                          * TODO: Handle special chars in string, like umlauts.
1719                          */
1720                         if(p[1] == ';') {
1721                                 XStoreName(xw.dpy, xw.win, strescseq.buf+2);
1722                         }
1723                         break;
1724                 case ';':
1725                         XStoreName(xw.dpy, xw.win, strescseq.buf+1);
1726                         break;
1727                 case '4': /* TODO: Set color (arg0) to "rgb:%hexr/$hexg/$hexb" (arg1) */
1728                         break;
1729                 default:
1730                         fprintf(stderr, "erresc: unknown str ");
1731                         strdump();
1732                         break;
1733                 }
1734                 break;
1735         case 'k': /* old title set compatibility */
1736                 XStoreName(xw.dpy, xw.win, strescseq.buf);
1737                 break;
1738         case 'P': /* DSC -- Device Control String */
1739         case '_': /* APC -- Application Program Command */
1740         case '^': /* PM -- Privacy Message */
1741         default:
1742                 fprintf(stderr, "erresc: unknown str ");
1743                 strdump();
1744                 /* die(""); */
1745                 break;
1746         }
1747 }
1748
1749 void
1750 strparse(void) {
1751         /*
1752          * TODO: Implement parsing like for CSI when required.
1753          * Format: ESC type cmd ';' arg0 [';' argn] ESC \
1754          */
1755         return;
1756 }
1757
1758 void
1759 strdump(void) {
1760         int i;
1761         uint c;
1762
1763         printf("ESC%c", strescseq.type);
1764         for(i = 0; i < strescseq.len; i++) {
1765                 c = strescseq.buf[i] & 0xff;
1766                 if(isprint(c)) {
1767                         putchar(c);
1768                 } else if(c == '\n') {
1769                         printf("(\\n)");
1770                 } else if(c == '\r') {
1771                         printf("(\\r)");
1772                 } else if(c == 0x1b) {
1773                         printf("(\\e)");
1774                 } else {
1775                         printf("(%02x)", c);
1776                 }
1777         }
1778         printf("ESC\\\n");
1779 }
1780
1781 void
1782 strreset(void) {
1783         memset(&strescseq, 0, sizeof(strescseq));
1784 }
1785
1786 void
1787 tputtab(bool forward) {
1788         uint x = term.c.x;
1789
1790         if(forward) {
1791                 if(x == term.col)
1792                         return;
1793                 for(++x; x < term.col && !term.tabs[x]; ++x)
1794                         /* nothing */ ;
1795         } else {
1796                 if(x == 0)
1797                         return;
1798                 for(--x; x > 0 && !term.tabs[x]; --x)
1799                         /* nothing */ ;
1800         }
1801         tmoveto(x, term.c.y);
1802 }
1803
1804 void
1805 tputc(char *c, int len) {
1806         uchar ascii = *c;
1807         bool control = ascii < '\x20' || ascii == 0177;
1808
1809         if(iofd != -1) {
1810                 if (xwrite(iofd, c, len) < 0) {
1811                         fprintf(stderr, "Error writting in %s:%s\n",
1812                                 opt_io, strerror(errno));
1813                         close(iofd);
1814                         iofd = -1;
1815                 }
1816         }
1817         /*
1818          * STR sequences must be checked before of anything
1819          * because it can use some control codes as part of the sequence
1820          */
1821         if(term.esc & ESC_STR) {
1822                 switch(ascii) {
1823                 case '\033':
1824                         term.esc = ESC_START | ESC_STR_END;
1825                         break;
1826                 case '\a': /* backwards compatibility to xterm */
1827                         term.esc = 0;
1828                         strhandle();
1829                         break;
1830                 default:
1831                         strescseq.buf[strescseq.len++] = ascii;
1832                         if(strescseq.len+1 >= STR_BUF_SIZ) {
1833                                 term.esc = 0;
1834                                 strhandle();
1835                         }
1836                 }
1837                 return;
1838         }
1839         /*
1840          * Actions of control codes must be performed as soon they arrive
1841          * because they can be embedded inside a control sequence, and
1842          * they must not cause conflicts with sequences.
1843          */
1844         if(control) {
1845                 switch(ascii) {
1846                 case '\t':      /* HT */
1847                         tputtab(1);
1848                         return;
1849                 case '\b':      /* BS */
1850                         tmoveto(term.c.x-1, term.c.y);
1851                         return;
1852                 case '\r':      /* CR */
1853                         tmoveto(0, term.c.y);
1854                         return;
1855                 case '\f':      /* LF */
1856                 case '\v':      /* VT */
1857                 case '\n':      /* LF */
1858                         /* go to first col if the mode is set */
1859                         tnewline(IS_SET(MODE_CRLF));
1860                         return;
1861                 case '\a':      /* BEL */
1862                         if(!(xw.state & WIN_FOCUSED))
1863                                 xseturgency(1);
1864                         return;
1865                 case '\033':    /* ESC */
1866                         csireset();
1867                         term.esc = ESC_START;
1868                         return;
1869                 case '\016':    /* SO */
1870                         term.c.attr.mode |= ATTR_GFX;
1871                         return;
1872                 case '\017':    /* SI */
1873                         term.c.attr.mode &= ~ATTR_GFX;
1874                         return;
1875                 case '\032':    /* SUB */
1876                 case '\030':    /* CAN */
1877                         csireset();
1878                         return;
1879                  case '\005':   /* ENQ (IGNORED) */
1880                  case '\000':   /* NUL (IGNORED) */
1881                  case '\021':   /* XON (IGNORED) */
1882                  case '\023':   /* XOFF (IGNORED) */
1883                  case 0177:     /* DEL (IGNORED) */
1884                         return;
1885                 }
1886         } else if(term.esc & ESC_START) {
1887                 if(term.esc & ESC_CSI) {
1888                         csiescseq.buf[csiescseq.len++] = ascii;
1889                         if(BETWEEN(ascii, 0x40, 0x7E)
1890                                         || csiescseq.len >= ESC_BUF_SIZ) {
1891                                 term.esc = 0;
1892                                 csiparse(), csihandle();
1893                         }
1894                 } else if(term.esc & ESC_STR_END) {
1895                         term.esc = 0;
1896                         if(ascii == '\\')
1897                                 strhandle();
1898                 } else if(term.esc & ESC_ALTCHARSET) {
1899                         switch(ascii) {
1900                         case '0': /* Line drawing set */
1901                                 term.c.attr.mode |= ATTR_GFX;
1902                                 break;
1903                         case 'B': /* USASCII */
1904                                 term.c.attr.mode &= ~ATTR_GFX;
1905                                 break;
1906                         case 'A': /* UK (IGNORED) */
1907                         case '<': /* multinational charset (IGNORED) */
1908                         case '5': /* Finnish (IGNORED) */
1909                         case 'C': /* Finnish (IGNORED) */
1910                         case 'K': /* German (IGNORED) */
1911                                 break;
1912                         default:
1913                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1914                         }
1915                         term.esc = 0;
1916                 } else if(term.esc & ESC_TEST) {
1917                         if(ascii == '8') { /* DEC screen alignment test. */
1918                                 char E[UTF_SIZ] = "E";
1919                                 int x, y;
1920
1921                                 for(x = 0; x < term.col; ++x) {
1922                                         for(y = 0; y < term.row; ++y)
1923                                                 tsetchar(E, &term.c.attr, x, y);
1924                                 }
1925                         }
1926                         term.esc = 0;
1927                 } else {
1928                         switch(ascii) {
1929                         case '[':
1930                                 term.esc |= ESC_CSI;
1931                                 break;
1932                         case '#':
1933                                 term.esc |= ESC_TEST;
1934                                 break;
1935                         case 'P': /* DCS -- Device Control String */
1936                         case '_': /* APC -- Application Program Command */
1937                         case '^': /* PM -- Privacy Message */
1938                         case ']': /* OSC -- Operating System Command */
1939                         case 'k': /* old title set compatibility */
1940                                 strreset();
1941                                 strescseq.type = ascii;
1942                                 term.esc |= ESC_STR;
1943                                 break;
1944                         case '(': /* set primary charset G0 */
1945                                 term.esc |= ESC_ALTCHARSET;
1946                                 break;
1947                         case ')': /* set secondary charset G1 (IGNORED) */
1948                         case '*': /* set tertiary charset G2 (IGNORED) */
1949                         case '+': /* set quaternary charset G3 (IGNORED) */
1950                                 term.esc = 0;
1951                                 break;
1952                         case 'D': /* IND -- Linefeed */
1953                                 if(term.c.y == term.bot) {
1954                                         tscrollup(term.top, 1);
1955                                 } else {
1956                                         tmoveto(term.c.x, term.c.y+1);
1957                                 }
1958                                 term.esc = 0;
1959                                 break;
1960                         case 'E': /* NEL -- Next line */
1961                                 tnewline(1); /* always go to first col */
1962                                 term.esc = 0;
1963                                 break;
1964                         case 'H': /* HTS -- Horizontal tab stop */
1965                                 term.tabs[term.c.x] = 1;
1966                                 term.esc = 0;
1967                                 break;
1968                         case 'M': /* RI -- Reverse index */
1969                                 if(term.c.y == term.top) {
1970                                         tscrolldown(term.top, 1);
1971                                 } else {
1972                                         tmoveto(term.c.x, term.c.y-1);
1973                                 }
1974                                 term.esc = 0;
1975                                 break;
1976                         case 'Z': /* DECID -- Identify Terminal */
1977                                 ttywrite(VT102ID, sizeof(VT102ID) - 1);
1978                                 term.esc = 0;
1979                                 break;
1980                         case 'c': /* RIS -- Reset to inital state */
1981                                 treset();
1982                                 term.esc = 0;
1983                                 xresettitle();
1984                                 break;
1985                         case '=': /* DECPAM -- Application keypad */
1986                                 term.mode |= MODE_APPKEYPAD;
1987                                 term.esc = 0;
1988                                 break;
1989                         case '>': /* DECPNM -- Normal keypad */
1990                                 term.mode &= ~MODE_APPKEYPAD;
1991                                 term.esc = 0;
1992                                 break;
1993                         case '7': /* DECSC -- Save Cursor */
1994                                 tcursor(CURSOR_SAVE);
1995                                 term.esc = 0;
1996                                 break;
1997                         case '8': /* DECRC -- Restore Cursor */
1998                                 tcursor(CURSOR_LOAD);
1999                                 term.esc = 0;
2000                                 break;
2001                         case '\\': /* ST -- Stop */
2002                                 term.esc = 0;
2003                                 break;
2004                         default:
2005                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2006                                         (uchar) ascii, isprint(ascii)? ascii:'.');
2007                                 term.esc = 0;
2008                         }
2009                 }
2010                 /*
2011                  * All characters which forms part of a sequence are not
2012                  * printed
2013                  */
2014                 return;
2015         }
2016         /*
2017          * Display control codes only if we are in graphic mode
2018          */
2019         if(control && !(term.c.attr.mode & ATTR_GFX))
2020                 return;
2021         if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
2022                 sel.bx = -1;
2023         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
2024                 tnewline(1); /* always go to first col */
2025         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2026         if(term.c.x+1 < term.col)
2027                 tmoveto(term.c.x+1, term.c.y);
2028         else
2029                 term.c.state |= CURSOR_WRAPNEXT;
2030 }
2031
2032 int
2033 tresize(int col, int row) {
2034         int i, x;
2035         int minrow = MIN(row, term.row);
2036         int mincol = MIN(col, term.col);
2037         int slide = term.c.y - row + 1;
2038         bool *bp;
2039
2040         if(col < 1 || row < 1)
2041                 return 0;
2042
2043         /* free unneeded rows */
2044         i = 0;
2045         if(slide > 0) {
2046                 /* slide screen to keep cursor where we expect it -
2047                  * tscrollup would work here, but we can optimize to
2048                  * memmove because we're freeing the earlier lines */
2049                 for(/* i = 0 */; i < slide; i++) {
2050                         free(term.line[i]);
2051                         free(term.alt[i]);
2052                 }
2053                 memmove(term.line, term.line + slide, row * sizeof(Line));
2054                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
2055         }
2056         for(i += row; i < term.row; i++) {
2057                 free(term.line[i]);
2058                 free(term.alt[i]);
2059         }
2060
2061         /* resize to new height */
2062         term.line = xrealloc(term.line, row * sizeof(Line));
2063         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2064         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2065         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2066
2067         /* resize each row to new width, zero-pad if needed */
2068         for(i = 0; i < minrow; i++) {
2069                 term.dirty[i] = 1;
2070                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2071                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2072                 for(x = mincol; x < col; x++) {
2073                         term.line[i][x].state = 0;
2074                         term.alt[i][x].state = 0;
2075                 }
2076         }
2077
2078         /* allocate any new rows */
2079         for(/* i == minrow */; i < row; i++) {
2080                 term.dirty[i] = 1;
2081                 term.line[i] = xcalloc(col, sizeof(Glyph));
2082                 term.alt [i] = xcalloc(col, sizeof(Glyph));
2083         }
2084         if(col > term.col) {
2085                 bp = term.tabs + term.col;
2086
2087                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2088                 while(--bp > term.tabs && !*bp)
2089                         /* nothing */ ;
2090                 for(bp += TAB; bp < term.tabs + col; bp += TAB)
2091                         *bp = 1;
2092         }
2093         /* update terminal size */
2094         term.col = col;
2095         term.row = row;
2096         /* make use of the LIMIT in tmoveto */
2097         tmoveto(term.c.x, term.c.y);
2098         /* reset scrolling region */
2099         tsetscroll(0, row-1);
2100
2101         return (slide > 0);
2102 }
2103
2104 void
2105 xresize(int col, int row) {
2106         xw.tw = MAX(1, 2*BORDER + col * xw.cw);
2107         xw.th = MAX(1, 2*BORDER + row * xw.ch);
2108
2109         XftDrawChange(xw.xft_draw, xw.buf);
2110 }
2111
2112 void
2113 xloadcols(void) {
2114         int i, r, g, b;
2115         XRenderColor xft_color = { .alpha = 0 };
2116
2117         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
2118         for(i = 0; i < LEN(colorname); i++) {
2119                 if(!colorname[i])
2120                         continue;
2121                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.xft_col[i])) {
2122                         die("Could not allocate color '%s'\n", colorname[i]);
2123                 }
2124         }
2125
2126         /* load colors [16-255] ; same colors as xterm */
2127         for(i = 16, r = 0; r < 6; r++) {
2128                 for(g = 0; g < 6; g++) {
2129                         for(b = 0; b < 6; b++) {
2130                                 xft_color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
2131                                 xft_color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
2132                                 xft_color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
2133                                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &xft_color, &dc.xft_col[i])) {
2134                                         die("Could not allocate color %d\n", i);
2135                                 }
2136                                 i++;
2137                         }
2138                 }
2139         }
2140
2141         for(r = 0; r < 24; r++, i++) {
2142                 xft_color.red = xft_color.green = xft_color.blue = 0x0808 + 0x0a0a * r;
2143                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &xft_color,
2144                                         &dc.xft_col[i])) {
2145                         die("Could not allocate color %d\n", i);
2146                 }
2147         }
2148 }
2149
2150 void
2151 xtermclear(int col1, int row1, int col2, int row2) {
2152         XftDrawRect(xw.xft_draw,
2153                         &dc.xft_col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG],
2154                         BORDER + col1 * xw.cw,
2155                         BORDER + row1 * xw.ch,
2156                         (col2-col1+1) * xw.cw,
2157                         (row2-row1+1) * xw.ch);
2158 }
2159
2160 /*
2161  * Absolute coordinates.
2162  */
2163 void
2164 xclear(int x1, int y1, int x2, int y2) {
2165         XftDrawRect(xw.xft_draw,
2166                         &dc.xft_col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG],
2167                         x1, y1, x2-x1, y2-y1);
2168 }
2169
2170 void
2171 xhints(void) {
2172         XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
2173         XWMHints wm = {.flags = InputHint, .input = 1};
2174         XSizeHints *sizeh = NULL;
2175
2176         sizeh = XAllocSizeHints();
2177         if(xw.isfixed == False) {
2178                 sizeh->flags = PSize | PResizeInc | PBaseSize;
2179                 sizeh->height = xw.h;
2180                 sizeh->width = xw.w;
2181                 sizeh->height_inc = xw.ch;
2182                 sizeh->width_inc = xw.cw;
2183                 sizeh->base_height = 2*BORDER;
2184                 sizeh->base_width = 2*BORDER;
2185         } else {
2186                 sizeh->flags = PMaxSize | PMinSize;
2187                 sizeh->min_width = sizeh->max_width = xw.fw;
2188                 sizeh->min_height = sizeh->max_height = xw.fh;
2189         }
2190
2191         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
2192         XFree(sizeh);
2193 }
2194
2195 int
2196 xloadfont(Font *f, FcPattern *pattern) {
2197         FcPattern *match;
2198         FcResult result;
2199
2200         match = XftFontMatch(xw.dpy, xw.scr, pattern, &result);
2201         if(!match)
2202                 return 1;
2203         if(!(f->xft_set = XftFontOpenPattern(xw.dpy, match))) {
2204                 FcPatternDestroy(match);
2205                 return 1;
2206         }
2207
2208         f->ascent = f->xft_set->ascent;
2209         f->descent = f->xft_set->descent;
2210         f->lbearing = 0;
2211         f->rbearing = f->xft_set->max_advance_width;
2212
2213         f->height = f->xft_set->height;
2214         f->width = f->lbearing + f->rbearing;
2215
2216         return 0;
2217 }
2218
2219 void
2220 xloadfonts(char *fontstr, int fontsize) {
2221         FcPattern *pattern;
2222         FcResult result;
2223         double fontval;
2224
2225         pattern = FcNameParse((FcChar8 *)fontstr);
2226         if(!pattern)
2227                 die("st: can't open font %s\n", fontstr);
2228
2229         if(fontsize > 0) {
2230                 FcPatternDel(pattern, FC_PIXEL_SIZE);
2231                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
2232                 usedfontsize = fontsize;
2233         } else {
2234                 result = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
2235                 if(result == FcResultMatch) {
2236                         usedfontsize = (int)fontval;
2237                 } else {
2238                         /*
2239                          * Default font size is 12, if none given. This is to
2240                          * have a known usedfontsize value.
2241                          */
2242                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
2243                         usedfontsize = 12;
2244                 }
2245         }
2246
2247         if(xloadfont(&dc.font, pattern))
2248                 die("st: can't open font %s\n", fontstr);
2249
2250         /* Setting character width and height. */
2251         xw.cw = dc.font.width;
2252         xw.ch = dc.font.height;
2253
2254         FcPatternDel(pattern, FC_WEIGHT);
2255         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
2256         if(xloadfont(&dc.bfont, pattern))
2257                 die("st: can't open font %s\n", fontstr);
2258
2259         FcPatternDel(pattern, FC_SLANT);
2260         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
2261         if(xloadfont(&dc.ibfont, pattern))
2262                 die("st: can't open font %s\n", fontstr);
2263
2264         FcPatternDel(pattern, FC_WEIGHT);
2265         if(xloadfont(&dc.ifont, pattern))
2266                 die("st: can't open font %s\n", fontstr);
2267
2268         FcPatternDestroy(pattern);
2269 }
2270
2271 void
2272 xzoom(const Arg *arg)
2273 {
2274         xloadfonts(usedfont, usedfontsize + arg->i);
2275         cresize(0, 0);
2276         draw();
2277 }
2278
2279 void
2280 xinit(void) {
2281         XSetWindowAttributes attrs;
2282         Cursor cursor;
2283         Window parent;
2284         int sw, sh, major, minor;
2285
2286         if(!(xw.dpy = XOpenDisplay(NULL)))
2287                 die("Can't open display\n");
2288         xw.scr = XDefaultScreen(xw.dpy);
2289         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
2290
2291         /* font */
2292         usedfont = (opt_font == NULL)? FONT : opt_font;
2293         xloadfonts(usedfont, 0);
2294
2295         /* colors */
2296         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
2297         xloadcols();
2298
2299         /* adjust fixed window geometry */
2300         if(xw.isfixed) {
2301                 sw = DisplayWidth(xw.dpy, xw.scr);
2302                 sh = DisplayHeight(xw.dpy, xw.scr);
2303                 if(xw.fx < 0)
2304                         xw.fx = sw + xw.fx - xw.fw - 1;
2305                 if(xw.fy < 0)
2306                         xw.fy = sh + xw.fy - xw.fh - 1;
2307
2308                 xw.h = xw.fh;
2309                 xw.w = xw.fw;
2310         } else {
2311                 /* window - default size */
2312                 xw.h = 2*BORDER + term.row * xw.ch;
2313                 xw.w = 2*BORDER + term.col * xw.cw;
2314                 xw.fx = 0;
2315                 xw.fy = 0;
2316         }
2317
2318         attrs.background_pixel = dc.xft_col[DefaultBG].pixel;
2319         attrs.border_pixel = dc.xft_col[DefaultBG].pixel;
2320         attrs.bit_gravity = NorthWestGravity;
2321         attrs.event_mask = FocusChangeMask | KeyPressMask
2322                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
2323                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
2324         attrs.colormap = xw.cmap;
2325
2326         parent = opt_embed ? strtol(opt_embed, NULL, 0) : XRootWindow(xw.dpy, xw.scr);
2327         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
2328                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
2329                         xw.vis,
2330                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
2331                         | CWColormap,
2332                         &attrs);
2333
2334         /* double buffering */
2335         if(!XdbeQueryExtension(xw.dpy, &major, &minor))
2336                 die("Xdbe extension is not present\n");
2337         xw.buf = XdbeAllocateBackBufferName(xw.dpy, xw.win, XdbeCopied);
2338
2339         /* Xft rendering context */
2340         xw.xft_draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
2341
2342         /* input methods */
2343         xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
2344         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
2345                                            | XIMStatusNothing, XNClientWindow, xw.win,
2346                                            XNFocusWindow, xw.win, NULL);
2347         /* gc */
2348         dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
2349
2350         /* white cursor, black outline */
2351         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
2352         XDefineCursor(xw.dpy, xw.win, cursor);
2353         XRecolorCursor(xw.dpy, cursor,
2354                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
2355                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
2356
2357         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
2358         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
2359         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
2360
2361         xresettitle();
2362         XMapWindow(xw.dpy, xw.win);
2363         xhints();
2364         XSync(xw.dpy, 0);
2365 }
2366
2367 void
2368 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
2369         int winx = BORDER + x * xw.cw, winy = BORDER + y * xw.ch,
2370             width = charlen * xw.cw;
2371         Font *font = &dc.font;
2372         XGlyphInfo extents;
2373         XftColor *fg = &dc.xft_col[base.fg], *bg = &dc.xft_col[base.bg],
2374                  *temp, revfg, revbg;
2375         XRenderColor colfg, colbg;
2376
2377         if(base.mode & ATTR_REVERSE)
2378                 temp = fg, fg = bg, bg = temp;
2379
2380         if(base.mode & ATTR_BOLD) {
2381                 if(BETWEEN(base.fg, 0, 7)) {
2382                         /* basic system colors */
2383                         fg = &dc.xft_col[base.fg + 8];
2384                 } else if(BETWEEN(base.fg, 16, 195)) {
2385                         /* 256 colors */
2386                         fg = &dc.xft_col[base.fg + 36];
2387                 } else if(BETWEEN(base.fg, 232, 251)) {
2388                         /* greyscale */
2389                         fg = &dc.xft_col[base.fg + 4];
2390                 }
2391                 /*
2392                  * Those ranges will not be brightened:
2393                  *      8 - 15 – bright system colors
2394                  *      196 - 231 – highest 256 color cube
2395                  *      252 - 255 – brightest colors in greyscale
2396                  */
2397                 font = &dc.bfont;
2398         }
2399
2400         if(base.mode & ATTR_ITALIC)
2401                 font = &dc.ifont;
2402         if(base.mode & (ATTR_ITALIC|ATTR_ITALIC))
2403                 font = &dc.ibfont;
2404
2405         if(IS_SET(MODE_REVERSE)) {
2406                 if(fg == &dc.xft_col[DefaultFG]) {
2407                         fg = &dc.xft_col[DefaultBG];
2408                 } else {
2409                         colfg.red = ~fg->color.red;
2410                         colfg.green = ~fg->color.green;
2411                         colfg.blue = ~fg->color.blue;
2412                         colfg.alpha = fg->color.alpha;
2413                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
2414                         fg = &revfg;
2415                 }
2416
2417                 if(bg == &dc.xft_col[DefaultBG]) {
2418                         bg = &dc.xft_col[DefaultFG];
2419                 } else {
2420                         colbg.red = ~bg->color.red;
2421                         colbg.green = ~bg->color.green;
2422                         colbg.blue = ~bg->color.blue;
2423                         colbg.alpha = bg->color.alpha;
2424                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &revbg);
2425                         bg = &revbg;
2426                 }
2427         }
2428
2429         XftTextExtentsUtf8(xw.dpy, font->xft_set, (FcChar8 *)s, bytelen,
2430                         &extents);
2431         width = extents.xOff;
2432
2433         /* Intelligent cleaning up of the borders. */
2434         if(x == 0) {
2435                 xclear(0, (y == 0)? 0 : winy, BORDER,
2436                         winy + xw.ch + (y == term.row-1)? xw.h : 0);
2437         }
2438         if(x + charlen >= term.col-1) {
2439                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
2440                         (y == term.row-1)? xw.h : (winy + xw.ch));
2441         }
2442         if(y == 0)
2443                 xclear(winx, 0, winx + width, BORDER);
2444         if(y == term.row-1)
2445                 xclear(winx, winy + xw.ch, winx + width, xw.h);
2446
2447         XftDrawRect(xw.xft_draw, bg, winx, winy, width, xw.ch);
2448         XftDrawStringUtf8(xw.xft_draw, fg, font->xft_set, winx,
2449                         winy + font->ascent, (FcChar8 *)s, bytelen);
2450
2451         if(base.mode & ATTR_UNDERLINE) {
2452                 XftDrawRect(xw.xft_draw, fg, winx, winy + font->ascent + 1,
2453                                 width, 1);
2454         }
2455 }
2456
2457 void
2458 xdrawcursor(void) {
2459         static int oldx = 0, oldy = 0;
2460         int sl;
2461         Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
2462
2463         LIMIT(oldx, 0, term.col-1);
2464         LIMIT(oldy, 0, term.row-1);
2465
2466         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
2467                 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
2468
2469         /* remove the old cursor */
2470         if(term.line[oldy][oldx].state & GLYPH_SET) {
2471                 sl = utf8size(term.line[oldy][oldx].c);
2472                 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
2473                                 oldy, 1, sl);
2474         } else {
2475                 xtermclear(oldx, oldy, oldx, oldy);
2476         }
2477
2478         /* draw the new one */
2479         if(!(term.c.state & CURSOR_HIDE)) {
2480                 if(!(xw.state & WIN_FOCUSED))
2481                         g.bg = DefaultUCS;
2482
2483                 if(IS_SET(MODE_REVERSE))
2484                         g.mode |= ATTR_REVERSE, g.fg = DefaultCS, g.bg = DefaultFG;
2485
2486                 sl = utf8size(g.c);
2487                 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
2488                 oldx = term.c.x, oldy = term.c.y;
2489         }
2490 }
2491
2492 void
2493 xresettitle(void) {
2494         XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
2495 }
2496
2497 void
2498 redraw(void) {
2499         struct timespec tv = {0, REDRAW_TIMEOUT * 1000};
2500
2501         tfulldirt();
2502         draw();
2503         XSync(xw.dpy, False); /* necessary for a good tput flash */
2504         nanosleep(&tv, NULL);
2505 }
2506
2507 void
2508 draw(void) {
2509         XdbeSwapInfo swpinfo[1] = {{xw.win, XdbeCopied}};
2510
2511         drawregion(0, 0, term.col, term.row);
2512         XdbeSwapBuffers(xw.dpy, swpinfo, 1);
2513 }
2514
2515 void
2516 drawregion(int x1, int y1, int x2, int y2) {
2517         int ic, ib, x, y, ox, sl;
2518         Glyph base, new;
2519         char buf[DRAW_BUF_SIZ];
2520         bool ena_sel = sel.bx != -1, alt = IS_SET(MODE_ALTSCREEN);
2521
2522         if((sel.alt && !alt) || (!sel.alt && alt))
2523                 ena_sel = 0;
2524         if(!(xw.state & WIN_VISIBLE))
2525                 return;
2526
2527         for(y = y1; y < y2; y++) {
2528                 if(!term.dirty[y])
2529                         continue;
2530
2531                 xtermclear(0, y, term.col, y);
2532                 term.dirty[y] = 0;
2533                 base = term.line[y][0];
2534                 ic = ib = ox = 0;
2535                 for(x = x1; x < x2; x++) {
2536                         new = term.line[y][x];
2537                         if(ena_sel && *(new.c) && selected(x, y))
2538                                 new.mode ^= ATTR_REVERSE;
2539                         if(ib > 0 && (!(new.state & GLYPH_SET)
2540                                         || ATTRCMP(base, new)
2541                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
2542                                 xdraws(buf, base, ox, y, ic, ib);
2543                                 ic = ib = 0;
2544                         }
2545                         if(new.state & GLYPH_SET) {
2546                                 if(ib == 0) {
2547                                         ox = x;
2548                                         base = new;
2549                                 }
2550                                 sl = utf8size(new.c);
2551                                 memcpy(buf+ib, new.c, sl);
2552                                 ib += sl;
2553                                 ++ic;
2554                         }
2555                 }
2556                 if(ib > 0)
2557                         xdraws(buf, base, ox, y, ic, ib);
2558         }
2559         xdrawcursor();
2560 }
2561
2562 void
2563 expose(XEvent *ev) {
2564         XExposeEvent *e = &ev->xexpose;
2565
2566         if(xw.state & WIN_REDRAW) {
2567                 if(!e->count)
2568                         xw.state &= ~WIN_REDRAW;
2569         }
2570 }
2571
2572 void
2573 visibility(XEvent *ev) {
2574         XVisibilityEvent *e = &ev->xvisibility;
2575
2576         if(e->state == VisibilityFullyObscured) {
2577                 xw.state &= ~WIN_VISIBLE;
2578         } else if(!(xw.state & WIN_VISIBLE)) {
2579                 /* need a full redraw for next Expose, not just a buf copy */
2580                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
2581         }
2582 }
2583
2584 void
2585 unmap(XEvent *ev) {
2586         xw.state &= ~WIN_VISIBLE;
2587 }
2588
2589 void
2590 xseturgency(int add) {
2591         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
2592
2593         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
2594         XSetWMHints(xw.dpy, xw.win, h);
2595         XFree(h);
2596 }
2597
2598 void
2599 focus(XEvent *ev) {
2600         if(ev->type == FocusIn) {
2601                 xw.state |= WIN_FOCUSED;
2602                 xseturgency(0);
2603         } else {
2604                 xw.state &= ~WIN_FOCUSED;
2605         }
2606 }
2607
2608 char*
2609 kmap(KeySym k, uint state) {
2610         int i;
2611         uint mask;
2612
2613         state &= ~Mod2Mask;
2614         for(i = 0; i < LEN(key); i++) {
2615                 mask = key[i].mask;
2616
2617                 if(key[i].k == k && ((state & mask) == mask
2618                                 || (mask == XK_NO_MOD && !state))) {
2619                         return (char*)key[i].s;
2620                 }
2621         }
2622         return NULL;
2623 }
2624
2625 void
2626 kpress(XEvent *ev) {
2627         XKeyEvent *e = &ev->xkey;
2628         KeySym ksym;
2629         char buf[32], *customkey;
2630         int len, meta, shift, i;
2631         Status status;
2632
2633         if (IS_SET(MODE_KBDLOCK))
2634                 return;
2635
2636         meta = e->state & Mod1Mask;
2637         shift = e->state & ShiftMask;
2638         len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
2639
2640         /* 1. shortcuts */
2641         for(i = 0; i < LEN(shortcuts); i++) {
2642                 if((ksym == shortcuts[i].keysym)
2643                                 && (CLEANMASK(shortcuts[i].mod) == \
2644                                         CLEANMASK(e->state))
2645                                 && shortcuts[i].func) {
2646                         shortcuts[i].func(&(shortcuts[i].arg));
2647                 }
2648         }
2649
2650         /* 2. custom keys from config.h */
2651         if((customkey = kmap(ksym, e->state))) {
2652                 ttywrite(customkey, strlen(customkey));
2653         /* 2. hardcoded (overrides X lookup) */
2654         } else {
2655                 switch(ksym) {
2656                 case XK_Up:
2657                 case XK_Down:
2658                 case XK_Left:
2659                 case XK_Right:
2660                         /* XXX: shift up/down doesn't work */
2661                         sprintf(buf, "\033%c%c",
2662                                 IS_SET(MODE_APPKEYPAD) ? 'O' : '[',
2663                                 (shift ? "dacb":"DACB")[ksym - XK_Left]);
2664                         ttywrite(buf, 3);
2665                         break;
2666                 case XK_Insert:
2667                         if(shift)
2668                                 selpaste();
2669                         break;
2670                 case XK_Return:
2671                         if(IS_SET(MODE_CRLF)) {
2672                                 ttywrite("\r\n", 2);
2673                         } else {
2674                                 ttywrite("\r", 1);
2675                         }
2676                         break;
2677                         /* 3. X lookup  */
2678                 default:
2679                         if(len > 0) {
2680                                 if(meta && len == 1)
2681                                         ttywrite("\033", 1);
2682                                 ttywrite(buf, len);
2683                         }
2684                         break;
2685                 }
2686         }
2687 }
2688
2689 void
2690 cmessage(XEvent *e) {
2691         /* See xembed specs
2692            http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html */
2693         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
2694                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
2695                         xw.state |= WIN_FOCUSED;
2696                         xseturgency(0);
2697                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
2698                         xw.state &= ~WIN_FOCUSED;
2699                 }
2700         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
2701                 /* Send SIGHUP to shell */
2702                 kill(pid, SIGHUP);
2703                 exit(EXIT_SUCCESS);
2704         }
2705 }
2706
2707 void
2708 cresize(int width, int height)
2709 {
2710         int col, row;
2711
2712         if(width != 0)
2713                 xw.w = width;
2714         if(height != 0)
2715                 xw.h = height;
2716
2717         col = (xw.w - 2*BORDER) / xw.cw;
2718         row = (xw.h - 2*BORDER) / xw.ch;
2719         if(col == term.col && row == term.row)
2720                 return;
2721
2722         tresize(col, row);
2723         xresize(col, row);
2724         ttyresize();
2725 }
2726
2727 void
2728 resize(XEvent *e) {
2729         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
2730                 return;
2731
2732         cresize(e->xconfigure.width, e->xconfigure.height);
2733 }
2734
2735 void
2736 run(void) {
2737         XEvent ev;
2738         fd_set rfd;
2739         int xfd = XConnectionNumber(xw.dpy), i;
2740         struct timeval drawtimeout, *tv = NULL;
2741
2742         for(i = 0;; i++) {
2743                 FD_ZERO(&rfd);
2744                 FD_SET(cmdfd, &rfd);
2745                 FD_SET(xfd, &rfd);
2746                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv) < 0) {
2747                         if(errno == EINTR)
2748                                 continue;
2749                         die("select failed: %s\n", SERRNO);
2750                 }
2751
2752                 /*
2753                  * Stop after a certain number of reads so the user does not
2754                  * feel like the system is stuttering.
2755                  */
2756                 if(i < 1000 && FD_ISSET(cmdfd, &rfd)) {
2757                         ttyread();
2758
2759                         /*
2760                          * Just wait a bit so it isn't disturbing the
2761                          * user and the system is able to write something.
2762                          */
2763                         drawtimeout.tv_sec = 0;
2764                         drawtimeout.tv_usec = 5;
2765                         tv = &drawtimeout;
2766                         continue;
2767                 }
2768                 i = 0;
2769                 tv = NULL;
2770
2771                 while(XPending(xw.dpy)) {
2772                         XNextEvent(xw.dpy, &ev);
2773                         if(XFilterEvent(&ev, xw.win))
2774                                 continue;
2775                         if(handler[ev.type])
2776                                 (handler[ev.type])(&ev);
2777                 }
2778
2779                 draw();
2780                 XFlush(xw.dpy);
2781         }
2782 }
2783
2784 int
2785 main(int argc, char *argv[]) {
2786         int i, bitm, xr, yr;
2787         uint wr, hr;
2788
2789         xw.fw = xw.fh = xw.fx = xw.fy = 0;
2790         xw.isfixed = False;
2791
2792         for(i = 1; i < argc; i++) {
2793                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
2794                 case 'c':
2795                         if(++i < argc)
2796                                 opt_class = argv[i];
2797                         break;
2798                 case 'e':
2799                         /* eat every remaining arguments */
2800                         if(++i < argc)
2801                                 opt_cmd = &argv[i];
2802                         goto run;
2803                 case 'f':
2804                         if(++i < argc)
2805                                 opt_font = argv[i];
2806                         break;
2807                 case 'g':
2808                         if(++i >= argc)
2809                                 break;
2810
2811                         bitm = XParseGeometry(argv[i], &xr, &yr, &wr, &hr);
2812                         if(bitm & XValue)
2813                                 xw.fx = xr;
2814                         if(bitm & YValue)
2815                                 xw.fy = yr;
2816                         if(bitm & WidthValue)
2817                                 xw.fw = (int)wr;
2818                         if(bitm & HeightValue)
2819                                 xw.fh = (int)hr;
2820                         if(bitm & XNegative && xw.fx == 0)
2821                                 xw.fx = -1;
2822                         if(bitm & XNegative && xw.fy == 0)
2823                                 xw.fy = -1;
2824
2825                         if(xw.fh != 0 && xw.fw != 0)
2826                                 xw.isfixed = True;
2827                         break;
2828                 case 'o':
2829                         if(++i < argc)
2830                                 opt_io = argv[i];
2831                         break;
2832                 case 't':
2833                         if(++i < argc)
2834                                 opt_title = argv[i];
2835                         break;
2836                 case 'v':
2837                 default:
2838                         die(USAGE);
2839                 case 'w':
2840                         if(++i < argc)
2841                                 opt_embed = argv[i];
2842                         break;
2843                 }
2844         }
2845
2846 run:
2847         setlocale(LC_CTYPE, "");
2848         tnew(80, 24);
2849         xinit();
2850         ttynew();
2851         selinit();
2852         run();
2853         return 0;
2854 }
2855