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 <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <sys/ioctl.h>
  15 #include <sys/select.h>
  16 #include <sys/stat.h>
  17 #include <sys/time.h>
  18 #include <sys/types.h>
  19 #include <sys/wait.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22 #include <X11/Xatom.h>
  23 #include <X11/Xlib.h>
  24 #include <X11/Xutil.h>
  25 #include <X11/cursorfont.h>
  26 #include <X11/keysym.h>
  27 #include <X11/extensions/Xdbe.h>
  28
  29 #if   defined(__linux)
  30  #include <pty.h>
  31 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  32  #include <util.h>
  33 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  34  #include <libutil.h>
  35 #endif
  36
  37 #define USAGE \
  38         "st " VERSION " (c) 2010-2012 st engineers\n" \
  39         "usage: st [-t title] [-c class] [-w windowid] [-v] [-e command...]\n"
  40
  41 /* XEMBED messages */
  42 #define XEMBED_FOCUS_IN  4
  43 #define XEMBED_FOCUS_OUT 5
  44
  45 /* Arbitrary sizes */
  46 #define ESC_BUF_SIZ   256
  47 #define ESC_ARG_SIZ   16
  48 #define STR_BUF_SIZ   256
  49 #define STR_ARG_SIZ   16
  50 #define DRAW_BUF_SIZ  1024
  51 #define UTF_SIZ       4
  52 #define XK_NO_MOD     UINT_MAX
  53 #define XK_ANY_MOD    0
  54
  55 #define SELECT_TIMEOUT (20*1000) /* 20 ms */
  56 #define DRAW_TIMEOUT  (20*1000) /* 20 ms */
  57
  58 #define SERRNO strerror(errno)
  59 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  60 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  61 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  62 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  63 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  64 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  65 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  66 #define IS_SET(flag) (term.mode & (flag))
  67 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  68 #define X2COL(x) (((x) - BORDER)/xw.cw)
  69 #define Y2ROW(y) (((y) - BORDER)/xw.ch)
  70
  71 enum glyph_attribute {
  72         ATTR_NULL      = 0,
  73         ATTR_REVERSE   = 1,
  74         ATTR_UNDERLINE = 2,
  75         ATTR_BOLD      = 4,
  76         ATTR_GFX       = 8,
  77 };
  78
  79 enum cursor_movement {
  80         CURSOR_UP,
  81         CURSOR_DOWN,
  82         CURSOR_LEFT,
  83         CURSOR_RIGHT,
  84         CURSOR_SAVE,
  85         CURSOR_LOAD
  86 };
  87
  88 enum cursor_state {
  89         CURSOR_DEFAULT  = 0,
  90         CURSOR_HIDE     = 1,
  91         CURSOR_WRAPNEXT = 2
  92 };
  93
  94 enum glyph_state {
  95         GLYPH_SET   = 1,
  96         GLYPH_DIRTY = 2
  97 };
  98
  99 enum term_mode {
 100         MODE_WRAP       = 1,
 101         MODE_INSERT      = 2,
 102         MODE_APPKEYPAD   = 4,
 103         MODE_ALTSCREEN   = 8,
 104         MODE_CRLF       = 16,
 105         MODE_MOUSEBTN    = 32,
 106         MODE_MOUSEMOTION = 64,
 107         MODE_MOUSE       = 32|64,
 108         MODE_REVERSE     = 128
 109 };
 110
 111 enum escape_state {
 112         ESC_START      = 1,
 113         ESC_CSI = 2,
 114         ESC_STR = 4, /* DSC, OSC, PM, APC */
 115         ESC_ALTCHARSET = 8,
 116         ESC_STR_END    = 16, /* a final string was encountered */
 117 };
 118
 119 enum window_state {
 120         WIN_VISIBLE = 1,
 121         WIN_REDRAW  = 2,
 122         WIN_FOCUSED = 4
 123 };
 124
 125 /* bit macro */
 126 #undef B0
 127 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
 128
 129 typedef unsigned char uchar;
 130 typedef unsigned int uint;
 131 typedef unsigned long ulong;
 132 typedef unsigned short ushort;
 133
 134 typedef struct {
 135         char c[UTF_SIZ];     /* character code */
 136         uchar mode;  /* attribute flags */
 137         ushort fg;   /* foreground  */
 138         ushort bg;   /* background  */
 139         uchar state; /* state flags    */
 140 } Glyph;
 141
 142 typedef Glyph* Line;
 143
 144 typedef struct {
 145         Glyph attr;      /* current char attributes */
 146         int x;
 147         int y;
 148         char state;
 149 } TCursor;
 150
 151 /* CSI Escape sequence structs */
 152 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 153 typedef struct {
 154         char buf[ESC_BUF_SIZ]; /* raw string */
 155         int len;               /* raw string length */
 156         char priv;
 157         int arg[ESC_ARG_SIZ];
 158         int narg;             /* nb of args */
 159         char mode;
 160 } CSIEscape;
 161
 162 /* STR Escape sequence structs */
 163 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 164 typedef struct {
 165         char type;           /* ESC type ... */
 166         char buf[STR_BUF_SIZ]; /* raw string */
 167         int len;               /* raw string length */
 168         char *args[STR_ARG_SIZ];
 169         int narg;             /* nb of args */
 170 } STREscape;
 171
 172 /* Internal representation of the screen */
 173 typedef struct {
 174         int row;        /* nb row */
 175         int col;        /* nb col */
 176         Line* line;     /* screen */
 177         Line* alt;      /* alternate screen */
 178         bool* dirty;    /* dirtyness of lines */
 179         TCursor c;      /* cursor */
 180         int top;        /* top    scroll limit */
 181         int bot;        /* bottom scroll limit */
 182         int mode;       /* terminal mode flags */
 183         int esc;        /* escape state flags */
 184         bool *tabs;
 185 } Term;
 186
 187 /* Purely graphic info */
 188 typedef struct {
 189         Display* dpy;
 190         Colormap cmap;
 191         Window win;
 192         XdbeBackBuffer buf;
 193         Atom xembed;
 194         XIM xim;
 195         XIC xic;
 196         int scr;
 197         int w;  /* window width */
 198         int h;  /* window height */
 199         int ch; /* char height */
 200         int cw; /* char width  */
 201         char state; /* focus, redraw, visible */
 202         struct timeval lastdraw;
 203 } XWindow;
 204
 205 typedef struct {
 206         KeySym k;
 207         uint mask;
 208         char s[ESC_BUF_SIZ];
 209 } Key;
 210
 211
 212 /* TODO: use better name for vars... */
 213 typedef struct {
 214         int mode;
 215         int bx, by;
 216         int ex, ey;
 217         struct {int x, y;} b, e;
 218         char *clip;
 219         Atom xtarget;
 220         struct timeval tclick1;
 221         struct timeval tclick2;
 222 } Selection;
 223
 224 #include "config.h"
 225
 226 /* Drawing Context */
 227 typedef struct {
 228         ulong col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 229         GC gc;
 230         struct {
 231                 int ascent;
 232                 int descent;
 233                 short lbearing;
 234                 short rbearing;
 235                 XFontSet set;
 236         } font, bfont;
 237 } DC;
 238
 239 static void die(const char*, ...);
 240 static void draw(void);
 241 static void drawregion(int, int, int, int);
 242 static void execsh(void);
 243 static void sigchld(int);
 244 static void run(void);
 245 static bool last_draw_too_old(void);
 246
 247 static void csidump(void);
 248 static void csihandle(void);
 249 static void csiparse(void);
 250 static void csireset(void);
 251 static void strdump(void);
 252 static void strhandle(void);
 253 static void strparse(void);
 254 static void strreset(void);
 255
 256 static void tclearregion(int, int, int, int);
 257 static void tcursor(int);
 258 static void tdeletechar(int);
 259 static void tdeleteline(int);
 260 static void tinsertblank(int);
 261 static void tinsertblankline(int);
 262 static void tmoveto(int, int);
 263 static void tnew(int, int);
 264 static void tnewline(int);
 265 static void tputtab(bool);
 266 static void tputc(char*);
 267 static void treset(void);
 268 static int tresize(int, int);
 269 static void tscrollup(int, int);
 270 static void tscrolldown(int, int);
 271 static void tsetattr(int*, int);
 272 static void tsetchar(char*);
 273 static void tsetscroll(int, int);
 274 static void tswapscreen(void);
 275 static void tsetdirt(int, int);
 276 static void tsetmode(bool, bool, int *, int);
 277 static void tfulldirt(void);
 278
 279 static void ttynew(void);
 280 static void ttyread(void);
 281 static void ttyresize(int, int);
 282 static void ttywrite(const char *, size_t);
 283
 284 static void xdraws(char *, Glyph, int, int, int, int);
 285 static void xhints(void);
 286 static void xclear(int, int, int, int);
 287 static void xcopy();
 288 static void xdrawcursor(void);
 289 static void xinit(void);
 290 static void xloadcols(void);
 291 static void xseturgency(int);
 292 static void xsetsel(char*);
 293 static void xresize(int, int);
 294
 295 static void expose(XEvent *);
 296 static void visibility(XEvent *);
 297 static void unmap(XEvent *);
 298 static char* kmap(KeySym, uint);
 299 static void kpress(XEvent *);
 300 static void cmessage(XEvent *);
 301 static void resize(XEvent *);
 302 static void focus(XEvent *);
 303 static void brelease(XEvent *);
 304 static void bpress(XEvent *);
 305 static void bmotion(XEvent *);
 306 static void selnotify(XEvent *);
 307 static void selrequest(XEvent *);
 308
 309 static void selinit(void);
 310 static inline bool selected(int, int);
 311 static void selcopy(void);
 312 static void selpaste();
 313 static void selscroll(int, int);
 314
 315 static int utf8decode(char *, long *);
 316 static int utf8encode(long *, char *);
 317 static int utf8size(char *);
 318 static int isfullutf8(char *, int);
 319
 320 static void (*handler[LASTEvent])(XEvent *) = {
 321         [KeyPress] = kpress,
 322         [ClientMessage] = cmessage,
 323         [ConfigureNotify] = resize,
 324         [VisibilityNotify] = visibility,
 325         [UnmapNotify] = unmap,
 326         [Expose] = expose,
 327         [FocusIn] = focus,
 328         [FocusOut] = focus,
 329         [MotionNotify] = bmotion,
 330         [ButtonPress] = bpress,
 331         [ButtonRelease] = brelease,
 332         [SelectionNotify] = selnotify,
 333         [SelectionRequest] = selrequest,
 334 };
 335
 336 /* Globals */
 337 static DC dc;
 338 static XWindow xw;
 339 static Term term;
 340 static CSIEscape csiescseq;
 341 static STREscape strescseq;
 342 static int cmdfd;
 343 static pid_t pid;
 344 static Selection sel;
 345 static char **opt_cmd  = NULL;
 346 static char *opt_title = NULL;
 347 static char *opt_embed = NULL;
 348 static char *opt_class = NULL;
 349
 350 int
 351 utf8decode(char *s, long *u) {
 352         uchar c;
 353         int i, n, rtn;
 354
 355         rtn = 1;
 356         c = *s;
 357         if(~c & B7) { /* 0xxxxxxx */
 358                 *u = c;
 359                 return rtn;
 360         } else if((c & (B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 361                 *u = c&(B4|B3|B2|B1|B0);
 362                 n = 1;
 363         } else if((c & (B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 364                 *u = c&(B3|B2|B1|B0);
 365                 n = 2;
 366         } else if((c & (B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 367                 *u = c & (B2|B1|B0);
 368                 n = 3;
 369         } else
 370                 goto invalid;
 371         for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
 372                 c = *s;
 373                 if((c & (B7|B6)) != B7) /* 10xxxxxx */
 374                         goto invalid;
 375                 *u <<= 6;
 376                 *u |= c & (B5|B4|B3|B2|B1|B0);
 377         }
 378         if((n == 1 && *u < 0x80) ||
 379            (n == 2 && *u < 0x800) ||
 380            (n == 3 && *u < 0x10000) ||
 381            (*u >= 0xD800 && *u <= 0xDFFF))
 382                 goto invalid;
 383         return rtn;
 384 invalid:
 385         *u = 0xFFFD;
 386         return rtn;
 387 }
 388
 389 int
 390 utf8encode(long *u, char *s) {
 391         uchar *sp;
 392         ulong uc;
 393         int i, n;
 394
 395         sp = (uchar*) s;
 396         uc = *u;
 397         if(uc < 0x80) {
 398                 *sp = uc; /* 0xxxxxxx */
 399                 return 1;
 400         } else if(*u < 0x800) {
 401                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 402                 n = 1;
 403         } else if(uc < 0x10000) {
 404                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 405                 n = 2;
 406         } else if(uc <= 0x10FFFF) {
 407                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 408                 n = 3;
 409         } else {
 410                 goto invalid;
 411         }
 412         for(i=n,++sp; i>0; --i,++sp)
 413                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 414         return n+1;
 415 invalid:
 416         /* U+FFFD */
 417         *s++ = '\xEF';
 418         *s++ = '\xBF';
 419         *s = '\xBD';
 420         return 3;
 421 }
 422
 423 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 424    UTF-8 otherwise return 0 */
 425 int
 426 isfullutf8(char *s, int b) {
 427         uchar *c1, *c2, *c3;
 428
 429         c1 = (uchar *) s;
 430         c2 = (uchar *) ++s;
 431         c3 = (uchar *) ++s;
 432         if(b < 1)
 433                 return 0;
 434         else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1)
 435                 return 0;
 436         else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
 437             ((b == 1) ||
 438             ((b == 2) && (*c2&(B7|B6)) == B7)))
 439                 return 0;
 440         else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
 441             ((b == 1) ||
 442             ((b == 2) && (*c2&(B7|B6)) == B7) ||
 443             ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7)))
 444                 return 0;
 445         else
 446                 return 1;
 447 }
 448
 449 int
 450 utf8size(char *s) {
 451         uchar c = *s;
 452
 453         if(~c&B7)
 454                 return 1;
 455         else if((c&(B7|B6|B5)) == (B7|B6))
 456                 return 2;
 457         else if((c&(B7|B6|B5|B4)) == (B7|B6|B5))
 458                 return 3;
 459         else
 460                 return 4;
 461 }
 462
 463 void
 464 selinit(void) {
 465         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 466         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 467         sel.mode = 0;
 468         sel.bx = -1;
 469         sel.clip = NULL;
 470         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 471         if(sel.xtarget == None)
 472                 sel.xtarget = XA_STRING;
 473 }
 474
 475 static inline bool
 476 selected(int x, int y) {
 477         if(sel.ey == y && sel.by == y) {
 478                 int bx = MIN(sel.bx, sel.ex);
 479                 int ex = MAX(sel.bx, sel.ex);
 480                 return BETWEEN(x, bx, ex);
 481         }
 482         return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
 483                 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
 484 }
 485
 486 void
 487 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 488         if(b)
 489                 *b = e->xbutton.button;
 490
 491         *x = X2COL(e->xbutton.x);
 492         *y = Y2ROW(e->xbutton.y);
 493         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 494         sel.b.y = MIN(sel.by, sel.ey);
 495         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 496         sel.e.y = MAX(sel.by, sel.ey);
 497 }
 498
 499 void
 500 mousereport(XEvent *e) {
 501         int x = X2COL(e->xbutton.x);
 502         int y = Y2ROW(e->xbutton.y);
 503         int button = e->xbutton.button;
 504         int state = e->xbutton.state;
 505         char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
 506         static int ob, ox, oy;
 507
 508         /* from urxvt */
 509         if(e->xbutton.type == MotionNotify) {
 510                 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
 511                         return;
 512                 button = ob + 32;
 513                 ox = x, oy = y;
 514         } else if(e->xbutton.type == ButtonRelease || button == AnyButton) {
 515                 button = 3;
 516         } else {
 517                 button -= Button1;
 518                 if(button >= 3)
 519                         button += 64 - 3;
 520                 if(e->xbutton.type == ButtonPress) {
 521                         ob = button;
 522                         ox = x, oy = y;
 523                 }
 524         }
 525
 526         buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
 527                 + (state & Mod4Mask    ? 8  : 0)
 528                 + (state & ControlMask ? 16 : 0);
 529
 530         ttywrite(buf, sizeof(buf));
 531 }
 532
 533 void
 534 bpress(XEvent *e) {
 535         if(IS_SET(MODE_MOUSE))
 536                 mousereport(e);
 537         else if(e->xbutton.button == Button1) {
 538                 if(sel.bx != -1)
 539                         tsetdirt(sel.b.y, sel.e.y);
 540                 sel.mode = 1;
 541                 sel.ex = sel.bx = X2COL(e->xbutton.x);
 542                 sel.ey = sel.by = Y2ROW(e->xbutton.y);
 543         }
 544 }
 545
 546 void
 547 selcopy(void) {
 548         char *str, *ptr;
 549         int x, y, bufsize, is_selected = 0;
 550
 551         if(sel.bx == -1)
 552                 str = NULL;
 553
 554         else {
 555                 bufsize = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
 556                 ptr = str = malloc(bufsize);
 557
 558                 /* append every set & selected glyph to the selection */
 559                 for(y = 0; y < term.row; y++) {
 560                         for(x = 0; x < term.col; x++) {
 561                                 is_selected = selected(x, y);
 562                                 if((term.line[y][x].state & GLYPH_SET) && is_selected) {
 563                                         int size = utf8size(term.line[y][x].c);
 564                                         memcpy(ptr, term.line[y][x].c, size);
 565                                         ptr += size;
 566                                 }
 567                         }
 568
 569                         /* \n at the end of every selected line except for the last one */
 570                         if(is_selected && y < sel.e.y)
 571                                 *ptr++ = '\n';
 572                 }
 573                 *ptr = 0;
 574         }
 575         xsetsel(str);
 576 }
 577
 578 void
 579 selnotify(XEvent *e) {
 580         ulong nitems, ofs, rem;
 581         int format;
 582         uchar *data;
 583         Atom type;
 584
 585         ofs = 0;
 586         do {
 587                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 588                                         False, AnyPropertyType, &type, &format,
 589                                         &nitems, &rem, &data)) {
 590                         fprintf(stderr, "Clipboard allocation failed\n");
 591                         return;
 592                 }
 593                 ttywrite((const char *) data, nitems * format / 8);
 594                 XFree(data);
 595                 /* number of 32-bit chunks returned */
 596                 ofs += nitems * format / 32;
 597         } while(rem > 0);
 598 }
 599
 600 void
 601 selpaste() {
 602         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY, xw.win, CurrentTime);
 603 }
 604
 605 void
 606 selrequest(XEvent *e) {
 607         XSelectionRequestEvent *xsre;
 608         XSelectionEvent xev;
 609         Atom xa_targets;
 610
 611         xsre = (XSelectionRequestEvent *) e;
 612         xev.type = SelectionNotify;
 613         xev.requestor = xsre->requestor;
 614         xev.selection = xsre->selection;
 615         xev.target = xsre->target;
 616         xev.time = xsre->time;
 617         /* reject */
 618         xev.property = None;
 619
 620         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 621         if(xsre->target == xa_targets) {
 622                 /* respond with the supported type */
 623                 Atom string = sel.xtarget;
 624                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 625                                 XA_ATOM, 32, PropModeReplace,
 626                                 (uchar *) &string, 1);
 627                 xev.property = xsre->property;
 628         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
 629                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 630                                 xsre->target, 8, PropModeReplace,
 631                                 (uchar *) sel.clip, strlen(sel.clip));
 632                 xev.property = xsre->property;
 633         }
 634
 635         /* all done, send a notification to the listener */
 636         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
 637                 fprintf(stderr, "Error sending SelectionNotify event\n");
 638 }
 639
 640 void
 641 xsetsel(char *str) {
 642         /* register the selection for both the clipboard and the primary */
 643         Atom clipboard;
 644
 645         free(sel.clip);
 646         sel.clip = str;
 647
 648         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
 649
 650         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 651         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 652
 653         XFlush(xw.dpy);
 654 }
 655
 656 void
 657 brelease(XEvent *e) {
 658         if(IS_SET(MODE_MOUSE)) {
 659                 mousereport(e);
 660                 return;
 661         }
 662         if(e->xbutton.button == Button2)
 663                 selpaste();
 664         else if(e->xbutton.button == Button1) {
 665                 sel.mode = 0;
 666                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 667                 term.dirty[sel.ey] = 1;
 668                 if(sel.bx == sel.ex && sel.by == sel.ey) {
 669                         struct timeval now;
 670                         sel.bx = -1;
 671                         gettimeofday(&now, NULL);
 672
 673                         if(TIMEDIFF(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
 674                                 /* triple click on the line */
 675                                 sel.b.x = sel.bx = 0;
 676                                 sel.e.x = sel.ex = term.col;
 677                                 sel.b.y = sel.e.y = sel.ey;
 678                                 selcopy();
 679                         } else if(TIMEDIFF(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
 680                                 /* double click to select word */
 681                                 sel.bx = sel.ex;
 682                                 while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
 683                                           term.line[sel.ey][sel.bx-1].c[0] != ' ') sel.bx--;
 684                                 sel.b.x = sel.bx;
 685                                 while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
 686                                           term.line[sel.ey][sel.ex+1].c[0] != ' ') sel.ex++;
 687                                 sel.e.x = sel.ex;
 688                                 sel.b.y = sel.e.y = sel.ey;
 689                                 selcopy();
 690                         }
 691                 } else
 692                         selcopy();
 693         }
 694         memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
 695         gettimeofday(&sel.tclick1, NULL);
 696         draw();
 697 }
 698
 699 void
 700 bmotion(XEvent *e) {
 701         if(IS_SET(MODE_MOUSE)) {
 702                 mousereport(e);
 703                 return;
 704         }
 705         if(sel.mode) {
 706                 int oldey = sel.ey, oldex = sel.ex;
 707                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 708
 709                 if(oldey != sel.ey || oldex != sel.ex) {
 710                         int starty = MIN(oldey, sel.ey);
 711                         int endy = MAX(oldey, sel.ey);
 712                         tsetdirt(starty, endy);
 713                         draw();
 714                 }
 715         }
 716 }
 717
 718 void
 719 die(const char *errstr, ...) {
 720         va_list ap;
 721
 722         va_start(ap, errstr);
 723         vfprintf(stderr, errstr, ap);
 724         va_end(ap);
 725         exit(EXIT_FAILURE);
 726 }
 727
 728 void
 729 execsh(void) {
 730         char **args;
 731         char *envshell = getenv("SHELL");
 732
 733         DEFAULT(envshell, SHELL);
 734         putenv("TERM="TNAME);
 735         args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
 736         execvp(args[0], args);
 737         exit(EXIT_FAILURE);
 738 }
 739
 740 void
 741 sigchld(int a) {
 742         int stat = 0;
 743         if(waitpid(pid, &stat, 0) < 0)
 744                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 745         if(WIFEXITED(stat))
 746                 exit(WEXITSTATUS(stat));
 747         else
 748                 exit(EXIT_FAILURE);
 749 }
 750
 751 void
 752 ttynew(void) {
 753         int m, s;
 754
 755         /* seems to work fine on linux, openbsd and freebsd */
 756         struct winsize w = {term.row, term.col, 0, 0};
 757         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 758                 die("openpty failed: %s\n", SERRNO);
 759
 760         switch(pid = fork()) {
 761         case -1:
 762                 die("fork failed\n");
 763                 break;
 764         case 0:
 765                 setsid(); /* create a new process group */
 766                 dup2(s, STDIN_FILENO);
 767                 dup2(s, STDOUT_FILENO);
 768                 dup2(s, STDERR_FILENO);
 769                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 770                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 771                 close(s);
 772                 close(m);
 773                 execsh();
 774                 break;
 775         default:
 776                 close(s);
 777                 cmdfd = m;
 778                 signal(SIGCHLD, sigchld);
 779         }
 780 }
 781
 782 void
 783 dump(char c) {
 784         static int col;
 785         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 786         if(++col % 10 == 0)
 787                 fprintf(stderr, "\n");
 788 }
 789
 790 void
 791 ttyread(void) {
 792         static char buf[BUFSIZ];
 793         static int buflen = 0;
 794         char *ptr;
 795         char s[UTF_SIZ];
 796         int charsize; /* size of utf8 char in bytes */
 797         long utf8c;
 798         int ret;
 799
 800         /* append read bytes to unprocessed bytes */
 801         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
 802                 die("Couldn't read from shell: %s\n", SERRNO);
 803
 804         /* process every complete utf8 char */
 805         buflen += ret;
 806         ptr = buf;
 807         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
 808                 charsize = utf8decode(ptr, &utf8c);
 809                 utf8encode(&utf8c, s);
 810                 tputc(s);
 811                 ptr    += charsize;
 812                 buflen -= charsize;
 813         }
 814
 815         /* keep any uncomplete utf8 char for the next call */
 816         memmove(buf, ptr, buflen);
 817 }
 818
 819 void
 820 ttywrite(const char *s, size_t n) {
 821         if(write(cmdfd, s, n) == -1)
 822                 die("write error on tty: %s\n", SERRNO);
 823 }
 824
 825 void
 826 ttyresize(int x, int y) {
 827         struct winsize w;
 828
 829         w.ws_row = term.row;
 830         w.ws_col = term.col;
 831         w.ws_xpixel = w.ws_ypixel = 0;
 832         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 833                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 834 }
 835
 836 void
 837 tsetdirt(int top, int bot)
 838 {
 839         int i;
 840
 841         LIMIT(top, 0, term.row-1);
 842         LIMIT(bot, 0, term.row-1);
 843
 844         for(i = top; i <= bot; i++)
 845                 term.dirty[i] = 1;
 846 }
 847
 848 void
 849 tfulldirt(void)
 850 {
 851         tsetdirt(0, term.row-1);
 852 }
 853
 854 void
 855 tcursor(int mode) {
 856         static TCursor c;
 857
 858         if(mode == CURSOR_SAVE)
 859                 c = term.c;
 860         else if(mode == CURSOR_LOAD)
 861                 term.c = c, tmoveto(c.x, c.y);
 862 }
 863
 864 void
 865 treset(void) {
 866         unsigned i;
 867         term.c = (TCursor){{
 868                 .mode = ATTR_NULL,
 869                 .fg = DefaultFG,
 870                 .bg = DefaultBG
 871         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 872
 873         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
 874         for (i = TAB; i < term.col; i += TAB)
 875                 term.tabs[i] = 1;
 876         term.top = 0, term.bot = term.row - 1;
 877         term.mode = MODE_WRAP;
 878         tclearregion(0, 0, term.col-1, term.row-1);
 879 }
 880
 881 void
 882 tnew(int col, int row) {
 883         /* set screen size */
 884         term.row = row, term.col = col;
 885         term.line = malloc(term.row * sizeof(Line));
 886         term.alt  = malloc(term.row * sizeof(Line));
 887         term.dirty = malloc(term.row * sizeof(*term.dirty));
 888         term.tabs = malloc(term.col * sizeof(*term.tabs));
 889
 890         for(row = 0; row < term.row; row++) {
 891                 term.line[row] = malloc(term.col * sizeof(Glyph));
 892                 term.alt [row] = malloc(term.col * sizeof(Glyph));
 893                 term.dirty[row] = 0;
 894         }
 895         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
 896         /* setup screen */
 897         treset();
 898 }
 899
 900 void
 901 tswapscreen(void) {
 902         Line* tmp = term.line;
 903         term.line = term.alt;
 904         term.alt = tmp;
 905         term.mode ^= MODE_ALTSCREEN;
 906         tfulldirt();
 907 }
 908
 909 void
 910 tscrolldown(int orig, int n) {
 911         int i;
 912         Line temp;
 913
 914         LIMIT(n, 0, term.bot-orig+1);
 915
 916         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 917
 918         for(i = term.bot; i >= orig+n; i--) {
 919                 temp = term.line[i];
 920                 term.line[i] = term.line[i-n];
 921                 term.line[i-n] = temp;
 922
 923                 term.dirty[i] = 1;
 924                 term.dirty[i-n] = 1;
 925         }
 926
 927         selscroll(orig, n);
 928 }
 929
 930 void
 931 tscrollup(int orig, int n) {
 932         int i;
 933         Line temp;
 934         LIMIT(n, 0, term.bot-orig+1);
 935
 936         tclearregion(0, orig, term.col-1, orig+n-1);
 937
 938         for(i = orig; i <= term.bot-n; i++) {
 939                  temp = term.line[i];
 940                  term.line[i] = term.line[i+n];
 941                  term.line[i+n] = temp;
 942
 943                  term.dirty[i] = 1;
 944                  term.dirty[i+n] = 1;
 945         }
 946
 947         selscroll(orig, -n);
 948 }
 949
 950 void
 951 selscroll(int orig, int n) {
 952         if(sel.bx == -1)
 953                 return;
 954
 955         if(BETWEEN(sel.by, orig, term.bot) || BETWEEN(sel.ey, orig, term.bot)) {
 956                 if((sel.by += n) > term.bot || (sel.ey += n) < term.top) {
 957                         sel.bx = -1;
 958                         return;
 959                 }
 960                 if(sel.by < term.top) {
 961                         sel.by = term.top;
 962                         sel.bx = 0;
 963                 }
 964                 if(sel.ey > term.bot) {
 965                         sel.ey = term.bot;
 966                         sel.ex = term.col;
 967                 }
 968                 sel.b.y = sel.by, sel.b.x = sel.bx;
 969                 sel.e.y = sel.ey, sel.e.x = sel.ex;
 970         }
 971 }
 972
 973 void
 974 tnewline(int first_col) {
 975         int y = term.c.y;
 976         if(y == term.bot)
 977                 tscrollup(term.top, 1);
 978         else
 979                 y++;
 980         tmoveto(first_col ? 0 : term.c.x, y);
 981 }
 982
 983 void
 984 csiparse(void) {
 985         /* int noarg = 1; */
 986         char *p = csiescseq.buf;
 987
 988         csiescseq.narg = 0;
 989         if(*p == '?')
 990                 csiescseq.priv = 1, p++;
 991
 992         while(p < csiescseq.buf+csiescseq.len) {
 993                 while(isdigit(*p)) {
 994                         csiescseq.arg[csiescseq.narg] *= 10;
 995                         csiescseq.arg[csiescseq.narg] += *p++ - '0'/*, noarg = 0 */;
 996                 }
 997                 if(*p == ';' && csiescseq.narg+1 < ESC_ARG_SIZ)
 998                         csiescseq.narg++, p++;
 999                 else {
1000                         csiescseq.mode = *p;
1001                         csiescseq.narg++;
1002                         return;
1003                 }
1004         }
1005 }
1006
1007 void
1008 tmoveto(int x, int y) {
1009         LIMIT(x, 0, term.col-1);
1010         LIMIT(y, 0, term.row-1);
1011         term.c.state &= ~CURSOR_WRAPNEXT;
1012         term.c.x = x;
1013         term.c.y = y;
1014 }
1015
1016 void
1017 tsetchar(char *c) {
1018         term.dirty[term.c.y] = 1;
1019         term.line[term.c.y][term.c.x] = term.c.attr;
1020         memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
1021         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
1022 }
1023
1024 void
1025 tclearregion(int x1, int y1, int x2, int y2) {
1026         int x, y, temp;
1027
1028         if(x1 > x2)
1029                 temp = x1, x1 = x2, x2 = temp;
1030         if(y1 > y2)
1031                 temp = y1, y1 = y2, y2 = temp;
1032
1033         LIMIT(x1, 0, term.col-1);
1034         LIMIT(x2, 0, term.col-1);
1035         LIMIT(y1, 0, term.row-1);
1036         LIMIT(y2, 0, term.row-1);
1037
1038         for(y = y1; y <= y2; y++) {
1039                 term.dirty[y] = 1;
1040                 for(x = x1; x <= x2; x++)
1041                         term.line[y][x].state = 0;
1042         }
1043 }
1044
1045 void
1046 tdeletechar(int n) {
1047         int src = term.c.x + n;
1048         int dst = term.c.x;
1049         int size = term.col - src;
1050
1051         term.dirty[term.c.y] = 1;
1052
1053         if(src >= term.col) {
1054                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1055                 return;
1056         }
1057         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
1058         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1059 }
1060
1061 void
1062 tinsertblank(int n) {
1063         int src = term.c.x;
1064         int dst = src + n;
1065         int size = term.col - dst;
1066
1067         term.dirty[term.c.y] = 1;
1068
1069         if(dst >= term.col) {
1070                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1071                 return;
1072         }
1073         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
1074         tclearregion(src, term.c.y, dst - 1, term.c.y);
1075 }
1076
1077 void
1078 tinsertblankline(int n) {
1079         if(term.c.y < term.top || term.c.y > term.bot)
1080                 return;
1081
1082         tscrolldown(term.c.y, n);
1083 }
1084
1085 void
1086 tdeleteline(int n) {
1087         if(term.c.y < term.top || term.c.y > term.bot)
1088                 return;
1089
1090         tscrollup(term.c.y, n);
1091 }
1092
1093 void
1094 tsetattr(int *attr, int l) {
1095         int i;
1096
1097         for(i = 0; i < l; i++) {
1098                 switch(attr[i]) {
1099                 case 0:
1100                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
1101                         term.c.attr.fg = DefaultFG;
1102                         term.c.attr.bg = DefaultBG;
1103                         break;
1104                 case 1:
1105                         term.c.attr.mode |= ATTR_BOLD;
1106                         break;
1107                 case 3: /* enter standout (highlight) mode TODO: make it italic */
1108                         term.c.attr.mode |= ATTR_REVERSE;
1109                         break;
1110                 case 4:
1111                         term.c.attr.mode |= ATTR_UNDERLINE;
1112                         break;
1113                 case 7:
1114                         term.c.attr.mode |= ATTR_REVERSE;
1115                         break;
1116                 case 22:
1117                         term.c.attr.mode &= ~ATTR_BOLD;
1118                         break;
1119                 case 23: /* leave standout (highlight) mode TODO: make it italic */
1120                         term.c.attr.mode &= ~ATTR_REVERSE;
1121                         break;
1122                 case 24:
1123                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1124                         break;
1125                 case 27:
1126                         term.c.attr.mode &= ~ATTR_REVERSE;
1127                         break;
1128                 case 38:
1129                         if(i + 2 < l && attr[i + 1] == 5) {
1130                                 i += 2;
1131                                 if(BETWEEN(attr[i], 0, 255))
1132                                         term.c.attr.fg = attr[i];
1133                                 else
1134                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
1135                         }
1136                         else
1137                                 fprintf(stderr, "erresc(38): gfx attr %d unknown\n", attr[i]);
1138                         break;
1139                 case 39:
1140                         term.c.attr.fg = DefaultFG;
1141                         break;
1142                 case 48:
1143                         if(i + 2 < l && attr[i + 1] == 5) {
1144                                 i += 2;
1145                                 if(BETWEEN(attr[i], 0, 255))
1146                                         term.c.attr.bg = attr[i];
1147                                 else
1148                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
1149                         }
1150                         else
1151                                 fprintf(stderr, "erresc(48): gfx attr %d unknown\n", attr[i]);
1152                         break;
1153                 case 49:
1154                         term.c.attr.bg = DefaultBG;
1155                         break;
1156                 default:
1157                         if(BETWEEN(attr[i], 30, 37))
1158                                 term.c.attr.fg = attr[i] - 30;
1159                         else if(BETWEEN(attr[i], 40, 47))
1160                                 term.c.attr.bg = attr[i] - 40;
1161                         else if(BETWEEN(attr[i], 90, 97))
1162                                 term.c.attr.fg = attr[i] - 90 + 8;
1163                         else if(BETWEEN(attr[i], 100, 107))
1164                                 term.c.attr.fg = attr[i] - 100 + 8;
1165                         else
1166                                 fprintf(stderr, "erresc(default): gfx attr %d unknown\n", attr[i]), csidump();
1167                         break;
1168                 }
1169         }
1170 }
1171
1172 void
1173 tsetscroll(int t, int b) {
1174         int temp;
1175
1176         LIMIT(t, 0, term.row-1);
1177         LIMIT(b, 0, term.row-1);
1178         if(t > b) {
1179                 temp = t;
1180                 t = b;
1181                 b = temp;
1182         }
1183         term.top = t;
1184         term.bot = b;
1185 }
1186
1187 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1188
1189 void
1190 tsetmode(bool priv, bool set, int *args, int narg) {
1191         int *lim, mode;
1192
1193         for (lim = args + narg; args < lim; ++args) {
1194                 if(priv) {
1195                         switch(*args) {
1196                         case 1:
1197                                 MODBIT(term.mode, set, MODE_APPKEYPAD);
1198                                 break;
1199                         case 5: /* DECSCNM -- Reverve video */
1200                                 mode = term.mode;
1201                                 MODBIT(term.mode,set, MODE_REVERSE);
1202                                 if (mode != term.mode)
1203                                         draw();
1204                                 break;
1205                         case 7:
1206                                 MODBIT(term.mode, set, MODE_WRAP);
1207                                 break;
1208                         case 20:
1209                                 MODBIT(term.mode, set, MODE_CRLF);
1210                                 break;
1211                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1212                                 break;
1213                         case 25:
1214                                 MODBIT(term.c.state, !set, CURSOR_HIDE);
1215                                 break;
1216                         case 1000: /* 1000,1002: enable xterm mouse report */
1217                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1218                                 break;
1219                         case 1002:
1220                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1221                                 break;
1222                         case 1049: /* = 1047 and 1048 */
1223                         case 47:
1224                         case 1047:
1225                                 if(IS_SET(MODE_ALTSCREEN))
1226                                         tclearregion(0, 0, term.col-1, term.row-1);
1227                                 if ((set && !IS_SET(MODE_ALTSCREEN)) ||
1228                                     (!set && IS_SET(MODE_ALTSCREEN))) {
1229                                             tswapscreen();
1230                                 }
1231                                 if (*args != 1049)
1232                                         break;
1233                                 /* pass through */
1234                         case 1048:
1235                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1236                                 break;
1237                         default:
1238                                 fprintf(stderr,
1239                                         "erresc: unknown private set/reset mode %d\n",
1240                                         *args);
1241                                 break;
1242                         }
1243                 } else {
1244                         switch(*args) {
1245                         case 4:
1246                                 MODBIT(term.mode, set, MODE_INSERT);
1247                                 break;
1248                         default:
1249                                 fprintf(stderr,
1250                                         "erresc: unknown set/reset mode %d\n",
1251                                         *args);
1252                                 break;
1253                         }
1254                 }
1255         }
1256 }
1257 #undef MODBIT
1258
1259
1260 void
1261 csihandle(void) {
1262         switch(csiescseq.mode) {
1263         default:
1264         unknown:
1265                 fprintf(stderr, "erresc: unknown csi ");
1266                 csidump();
1267                 /* die(""); */
1268                 break;
1269         case '@': /* ICH -- Insert <n> blank char */
1270                 DEFAULT(csiescseq.arg[0], 1);
1271                 tinsertblank(csiescseq.arg[0]);
1272                 break;
1273         case 'A': /* CUU -- Cursor <n> Up */
1274         case 'e':
1275                 DEFAULT(csiescseq.arg[0], 1);
1276                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1277                 break;
1278         case 'B': /* CUD -- Cursor <n> Down */
1279                 DEFAULT(csiescseq.arg[0], 1);
1280                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1281                 break;
1282         case 'C': /* CUF -- Cursor <n> Forward */
1283         case 'a':
1284                 DEFAULT(csiescseq.arg[0], 1);
1285                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1286                 break;
1287         case 'D': /* CUB -- Cursor <n> Backward */
1288                 DEFAULT(csiescseq.arg[0], 1);
1289                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1290                 break;
1291         case 'E': /* CNL -- Cursor <n> Down and first col */
1292                 DEFAULT(csiescseq.arg[0], 1);
1293                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1294                 break;
1295         case 'F': /* CPL -- Cursor <n> Up and first col */
1296                 DEFAULT(csiescseq.arg[0], 1);
1297                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1298                 break;
1299         case 'g': /* TBC -- Tabulation clear */
1300                 switch (csiescseq.arg[0]) {
1301                 case 0: /* clear current tab stop */
1302                         term.tabs[term.c.x] = 0;
1303                         break;
1304                 case 3: /* clear all the tabs */
1305                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1306                         break;
1307                 default:
1308                         goto unknown;
1309                 }
1310                 break;
1311         case 'G': /* CHA -- Move to <col> */
1312         case '`': /* XXX: HPA -- same? */
1313                 DEFAULT(csiescseq.arg[0], 1);
1314                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1315                 break;
1316         case 'H': /* CUP -- Move to <row> <col> */
1317         case 'f': /* XXX: HVP -- same? */
1318                 DEFAULT(csiescseq.arg[0], 1);
1319                 DEFAULT(csiescseq.arg[1], 1);
1320                 tmoveto(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1321                 break;
1322         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1323                 DEFAULT(csiescseq.arg[0], 1);
1324                 while (csiescseq.arg[0]--)
1325                         tputtab(1);
1326                 break;
1327         case 'J': /* ED -- Clear screen */
1328                 sel.bx = -1;
1329                 switch(csiescseq.arg[0]) {
1330                 case 0: /* below */
1331                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1332                         if(term.c.y < term.row-1)
1333                                 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1334                         break;
1335                 case 1: /* above */
1336                         if(term.c.y > 1)
1337                                 tclearregion(0, 0, term.col-1, term.c.y-1);
1338                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1339                         break;
1340                 case 2: /* all */
1341                         tclearregion(0, 0, term.col-1, term.row-1);
1342                         break;
1343                 default:
1344                         goto unknown;
1345                 }
1346                 break;
1347         case 'K': /* EL -- Clear line */
1348                 switch(csiescseq.arg[0]) {
1349                 case 0: /* right */
1350                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1351                         break;
1352                 case 1: /* left */
1353                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1354                         break;
1355                 case 2: /* all */
1356                         tclearregion(0, term.c.y, term.col-1, term.c.y);
1357                         break;
1358                 }
1359                 break;
1360         case 'S': /* SU -- Scroll <n> line up */
1361                 DEFAULT(csiescseq.arg[0], 1);
1362                 tscrollup(term.top, csiescseq.arg[0]);
1363                 break;
1364         case 'T': /* SD -- Scroll <n> line down */
1365                 DEFAULT(csiescseq.arg[0], 1);
1366                 tscrolldown(term.top, csiescseq.arg[0]);
1367                 break;
1368         case 'L': /* IL -- Insert <n> blank lines */
1369                 DEFAULT(csiescseq.arg[0], 1);
1370                 tinsertblankline(csiescseq.arg[0]);
1371                 break;
1372         case 'l': /* RM -- Reset Mode */
1373                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
1374                 break;
1375         case 'M': /* DL -- Delete <n> lines */
1376                 DEFAULT(csiescseq.arg[0], 1);
1377                 tdeleteline(csiescseq.arg[0]);
1378                 break;
1379         case 'X': /* ECH -- Erase <n> char */
1380                 DEFAULT(csiescseq.arg[0], 1);
1381                 tclearregion(term.c.x, term.c.y, term.c.x + csiescseq.arg[0], term.c.y);
1382                 break;
1383         case 'P': /* DCH -- Delete <n> char */
1384                 DEFAULT(csiescseq.arg[0], 1);
1385                 tdeletechar(csiescseq.arg[0]);
1386                 break;
1387         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1388                 DEFAULT(csiescseq.arg[0], 1);
1389                 while (csiescseq.arg[0]--)
1390                         tputtab(0);
1391                 break;
1392         case 'd': /* VPA -- Move to <row> */
1393                 DEFAULT(csiescseq.arg[0], 1);
1394                 tmoveto(term.c.x, csiescseq.arg[0]-1);
1395                 break;
1396         case 'h': /* SM -- Set terminal mode */
1397                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
1398                 break;
1399         case 'm': /* SGR -- Terminal attribute (color) */
1400                 tsetattr(csiescseq.arg, csiescseq.narg);
1401                 break;
1402         case 'r': /* DECSTBM -- Set Scrolling Region */
1403                 if(csiescseq.priv)
1404                         goto unknown;
1405                 else {
1406                         DEFAULT(csiescseq.arg[0], 1);
1407                         DEFAULT(csiescseq.arg[1], term.row);
1408                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
1409                         tmoveto(0, 0);
1410                 }
1411                 break;
1412         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1413                 tcursor(CURSOR_SAVE);
1414                 break;
1415         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1416                 tcursor(CURSOR_LOAD);
1417                 break;
1418         }
1419 }
1420
1421 void
1422 csidump(void) {
1423         int i;
1424         printf("ESC[");
1425         for(i = 0; i < csiescseq.len; i++) {
1426                 uint c = csiescseq.buf[i] & 0xff;
1427                 if(isprint(c)) putchar(c);
1428                 else if(c == '\n') printf("(\\n)");
1429                 else if(c == '\r') printf("(\\r)");
1430                 else if(c == 0x1b) printf("(\\e)");
1431                 else printf("(%02x)", c);
1432         }
1433         putchar('\n');
1434 }
1435
1436 void
1437 csireset(void) {
1438         memset(&csiescseq, 0, sizeof(csiescseq));
1439 }
1440
1441 void
1442 strhandle(void) {
1443         char *p;
1444
1445         /*
1446          * TODO: make this being useful in case of color palette change.
1447          */
1448         strparse();
1449
1450         p = strescseq.buf;
1451
1452         switch(strescseq.type) {
1453         case ']': /* OSC -- Operating System Command */
1454                 switch(p[0]) {
1455                 case '0':
1456                 case '1':
1457                 case '2':
1458                         /*
1459                          * TODO: Handle special chars in string, like umlauts.
1460                          */
1461                         if(p[1] == ';') {
1462                                 XStoreName(xw.dpy, xw.win, strescseq.buf+2);
1463                         }
1464                         break;
1465                 case ';':
1466                         XStoreName(xw.dpy, xw.win, strescseq.buf+1);
1467                         break;
1468                 case '4': /* TODO: Set color (arg0) to "rgb:%hexr/$hexg/$hexb" (arg1) */
1469                         break;
1470                 default:
1471                         fprintf(stderr, "erresc: unknown str ");
1472                         strdump();
1473                         break;
1474                 }
1475                 break;
1476         case 'P': /* DSC -- Device Control String */
1477         case '_': /* APC -- Application Program Command */
1478         case '^': /* PM -- Privacy Message */
1479         default:
1480                 fprintf(stderr, "erresc: unknown str ");
1481                 strdump();
1482                 /* die(""); */
1483                 break;
1484         }
1485 }
1486
1487 void
1488 strparse(void) {
1489         /*
1490          * TODO: Implement parsing like for CSI when required.
1491          * Format: ESC type cmd ';' arg0 [';' argn] ESC \
1492          */
1493         return;
1494 }
1495
1496 void
1497 strdump(void) {
1498         int i;
1499         printf("ESC%c", strescseq.type);
1500         for(i = 0; i < strescseq.len; i++) {
1501                 uint c = strescseq.buf[i] & 0xff;
1502                 if(isprint(c)) putchar(c);
1503                 else if(c == '\n') printf("(\\n)");
1504                 else if(c == '\r') printf("(\\r)");
1505                 else if(c == 0x1b) printf("(\\e)");
1506                 else printf("(%02x)", c);
1507         }
1508         printf("ESC\\\n");
1509 }
1510
1511 void
1512 strreset(void) {
1513         memset(&strescseq, 0, sizeof(strescseq));
1514 }
1515
1516 void
1517 tputtab(bool forward) {
1518         unsigned x = term.c.x;
1519
1520         if (forward) {
1521                 if (x == term.col)
1522                         return;
1523                 for (++x; x < term.col && !term.tabs[x]; ++x)
1524                         /* nothing */ ;
1525         } else {
1526                 if (x == 0)
1527                         return;
1528                 for (--x; x > 0 && !term.tabs[x]; --x)
1529                         /* nothing */ ;
1530         }
1531         tmoveto(x, term.c.y);
1532 }
1533
1534 void
1535 tputc(char *c) {
1536         char ascii = *c;
1537         if(term.esc & ESC_START) {
1538                 if(term.esc & ESC_CSI) {
1539                         csiescseq.buf[csiescseq.len++] = ascii;
1540                         if(BETWEEN(ascii, 0x40, 0x7E) || csiescseq.len >= ESC_BUF_SIZ) {
1541                                 term.esc = 0;
1542                                 csiparse(), csihandle();
1543                         }
1544                 } else if(term.esc & ESC_STR) {
1545                         switch(ascii) {
1546                         case '\033':
1547                                 term.esc = ESC_START | ESC_STR_END;
1548                                 break;
1549                         case '\a': /* backwards compatibility to xterm */
1550                                 term.esc = 0;
1551                                 strhandle();
1552                                 break;
1553                         default:
1554                                 strescseq.buf[strescseq.len++] = ascii;
1555                                 if (strescseq.len+1 >= STR_BUF_SIZ) {
1556                                         term.esc = 0;
1557                                         strhandle();
1558                                 }
1559                         }
1560                 } else if(term.esc & ESC_STR_END) {
1561                         term.esc = 0;
1562                         if(ascii == '\\')
1563                                 strhandle();
1564                 } else if(term.esc & ESC_ALTCHARSET) {
1565                         switch(ascii) {
1566                         case '0': /* Line drawing crap */
1567                                 term.c.attr.mode |= ATTR_GFX;
1568                                 break;
1569                         case 'B': /* Back to regular text */
1570                                 term.c.attr.mode &= ~ATTR_GFX;
1571                                 break;
1572                         default:
1573                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1574                         }
1575                         term.esc = 0;
1576                 } else {
1577                         switch(ascii) {
1578                         case '[':
1579                                 term.esc |= ESC_CSI;
1580                                 break;
1581                         case 'P': /* DCS -- Device Control String */
1582                         case '_': /* APC -- Application Program Command */
1583                         case '^': /* PM -- Privacy Message */
1584                         case ']': /* OSC -- Operating System Command */
1585                                 strreset();
1586                                 strescseq.type = ascii;
1587                                 term.esc |= ESC_STR;
1588                                 break;
1589                         case '(':
1590                                 term.esc |= ESC_ALTCHARSET;
1591                                 break;
1592                         case 'D': /* IND -- Linefeed */
1593                                 if(term.c.y == term.bot)
1594                                         tscrollup(term.top, 1);
1595                                 else
1596                                         tmoveto(term.c.x, term.c.y+1);
1597                                 term.esc = 0;
1598                                 break;
1599                         case 'E': /* NEL -- Next line */
1600                                 tnewline(1); /* always go to first col */
1601                                 term.esc = 0;
1602                                 break;
1603                         case 'H': /* HTS -- Horizontal tab stop */
1604                                 term.tabs[term.c.x] = 1;
1605                                 term.esc = 0;
1606                                 break;
1607                         case 'M': /* RI -- Reverse index */
1608                                 if(term.c.y == term.top)
1609                                         tscrolldown(term.top, 1);
1610                                 else
1611                                         tmoveto(term.c.x, term.c.y-1);
1612                                 term.esc = 0;
1613                                 break;
1614                         case 'c': /* RIS -- Reset to inital state */
1615                                 treset();
1616                                 term.esc = 0;
1617                                 break;
1618                         case '=': /* DECPAM -- Application keypad */
1619                                 term.mode |= MODE_APPKEYPAD;
1620                                 term.esc = 0;
1621                                 break;
1622                         case '>': /* DECPNM -- Normal keypad */
1623                                 term.mode &= ~MODE_APPKEYPAD;
1624                                 term.esc = 0;
1625                                 break;
1626                         case '7': /* DECSC -- Save Cursor */
1627                                 tcursor(CURSOR_SAVE);
1628                                 term.esc = 0;
1629                                 break;
1630                         case '8': /* DECRC -- Restore Cursor */
1631                                 tcursor(CURSOR_LOAD);
1632                                 term.esc = 0;
1633                                 break;
1634                         case '\\': /* ST -- Stop */
1635                                 term.esc = 0;
1636                                 break;
1637                         default:
1638                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1639                                     (uchar) ascii, isprint(ascii)?ascii:'.');
1640                                 term.esc = 0;
1641                         }
1642                 }
1643         } else {
1644                 if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
1645                         sel.bx = -1;
1646                 switch(ascii) {
1647                 case '\t':
1648                         tputtab(1);
1649                         break;
1650                 case '\b':
1651                         tmoveto(term.c.x-1, term.c.y);
1652                         break;
1653                 case '\r':
1654                         tmoveto(0, term.c.y);
1655                         break;
1656                 case '\f':
1657                 case '\v':
1658                 case '\n':
1659                         /* go to first col if the mode is set */
1660                         tnewline(IS_SET(MODE_CRLF));
1661                         break;
1662                 case '\a':
1663                         if(!(xw.state & WIN_FOCUSED))
1664                                 xseturgency(1);
1665                         break;
1666                 case '\033':
1667                         csireset();
1668                         term.esc = ESC_START;
1669                         break;
1670                 default:
1671                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1672                                 tnewline(1); /* always go to first col */
1673                         tsetchar(c);
1674                         if(term.c.x+1 < term.col)
1675                                 tmoveto(term.c.x+1, term.c.y);
1676                         else
1677                                 term.c.state |= CURSOR_WRAPNEXT;
1678                 }
1679         }
1680 }
1681
1682 int
1683 tresize(int col, int row) {
1684         int i, x;
1685         int minrow = MIN(row, term.row);
1686         int mincol = MIN(col, term.col);
1687         int slide = term.c.y - row + 1;
1688
1689         if(col < 1 || row < 1)
1690                 return 0;
1691
1692         /* free unneeded rows */
1693         i = 0;
1694         if(slide > 0) {
1695                 /* slide screen to keep cursor where we expect it -
1696                  * tscrollup would work here, but we can optimize to
1697                  * memmove because we're freeing the earlier lines */
1698                 for(/* i = 0 */; i < slide; i++) {
1699                         free(term.line[i]);
1700                         free(term.alt[i]);
1701                 }
1702                 memmove(term.line, term.line + slide, row * sizeof(Line));
1703                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1704         }
1705         for(i += row; i < term.row; i++) {
1706                 free(term.line[i]);
1707                 free(term.alt[i]);
1708         }
1709
1710         /* resize to new height */
1711         term.line = realloc(term.line, row * sizeof(Line));
1712         term.alt  = realloc(term.alt,  row * sizeof(Line));
1713         term.dirty = realloc(term.dirty, row * sizeof(*term.dirty));
1714         term.tabs = realloc(term.tabs, col * sizeof(*term.tabs));
1715
1716         /* resize each row to new width, zero-pad if needed */
1717         for(i = 0; i < minrow; i++) {
1718                 term.dirty[i] = 1;
1719                 term.line[i] = realloc(term.line[i], col * sizeof(Glyph));
1720                 term.alt[i]  = realloc(term.alt[i],  col * sizeof(Glyph));
1721                 for(x = mincol; x < col; x++) {
1722                         term.line[i][x].state = 0;
1723                         term.alt[i][x].state = 0;
1724                 }
1725         }
1726
1727         /* allocate any new rows */
1728         for(/* i == minrow */; i < row; i++) {
1729                 term.dirty[i] = 1;
1730                 term.line[i] = calloc(col, sizeof(Glyph));
1731                 term.alt [i] = calloc(col, sizeof(Glyph));
1732         }
1733         if (col > term.col) {
1734                 bool *bp = term.tabs + term.col;
1735
1736                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
1737                 while (--bp > term.tabs && !*bp)
1738                         /* nothing */ ;
1739                 for (bp += TAB; bp < term.tabs + col; bp += TAB)
1740                         *bp = 1;
1741         }
1742         /* update terminal size */
1743         term.col = col, term.row = row;
1744         /* make use of the LIMIT in tmoveto */
1745         tmoveto(term.c.x, term.c.y);
1746         /* reset scrolling region */
1747         tsetscroll(0, row-1);
1748
1749         return (slide > 0);
1750 }
1751
1752 void
1753 xresize(int col, int row) {
1754         xw.w = MAX(1, 2*BORDER + col * xw.cw);
1755         xw.h = MAX(1, 2*BORDER + row * xw.ch);
1756 }
1757
1758 void
1759 xloadcols(void) {
1760         int i, r, g, b;
1761         XColor color;
1762         ulong white = WhitePixel(xw.dpy, xw.scr);
1763
1764         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
1765         for(i = 0; i < LEN(colorname); i++) {
1766                 if(!colorname[i])
1767                         continue;
1768                 if(!XAllocNamedColor(xw.dpy, xw.cmap, colorname[i], &color, &color)) {
1769                         dc.col[i] = white;
1770                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1771                 } else
1772                         dc.col[i] = color.pixel;
1773         }
1774
1775         /* load colors [16-255] ; same colors as xterm */
1776         for(i = 16, r = 0; r < 6; r++)
1777                 for(g = 0; g < 6; g++)
1778                         for(b = 0; b < 6; b++) {
1779                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1780                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1781                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1782                                 if(!XAllocColor(xw.dpy, xw.cmap, &color)) {
1783                                         dc.col[i] = white;
1784                                         fprintf(stderr, "Could not allocate color %d\n", i);
1785                                 } else
1786                                         dc.col[i] = color.pixel;
1787                                 i++;
1788                         }
1789
1790         for(r = 0; r < 24; r++, i++) {
1791                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1792                 if (!XAllocColor(xw.dpy, xw.cmap, &color)) {
1793                         dc.col[i] = white;
1794                         fprintf(stderr, "Could not allocate color %d\n", i);
1795                 } else
1796                         dc.col[i] = color.pixel;
1797         }
1798 }
1799
1800 void
1801 xclear(int x1, int y1, int x2, int y2) {
1802         XSetForeground(xw.dpy, dc.gc, dc.col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG]);
1803         XFillRectangle(xw.dpy, xw.buf, dc.gc,
1804                        BORDER + x1 * xw.cw, BORDER + y1 * xw.ch,
1805                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1806 }
1807
1808 void
1809 xhints(void) {
1810         XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
1811         XWMHints wm = {.flags = InputHint, .input = 1};
1812         XSizeHints size = {
1813                 .flags = PSize | PResizeInc | PBaseSize,
1814                 .height = xw.h,
1815                 .width = xw.w,
1816                 .height_inc = xw.ch,
1817                 .width_inc = xw.cw,
1818                 .base_height = 2*BORDER,
1819                 .base_width = 2*BORDER,
1820         };
1821         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, &size, &wm, &class);
1822 }
1823
1824 XFontSet
1825 xinitfont(char *fontstr) {
1826         XFontSet set;
1827         char *def, **missing;
1828         int n;
1829
1830         missing = NULL;
1831         set = XCreateFontSet(xw.dpy, fontstr, &missing, &n, &def);
1832         if(missing) {
1833                 while(n--)
1834                         fprintf(stderr, "st: missing fontset: %s\n", missing[n]);
1835                 XFreeStringList(missing);
1836         }
1837         return set;
1838 }
1839
1840 void
1841 xgetfontinfo(XFontSet set, int *ascent, int *descent, short *lbearing, short *rbearing) {
1842         XFontStruct **xfonts;
1843         char **font_names;
1844         int i, n;
1845
1846         *ascent = *descent = *lbearing = *rbearing = 0;
1847         n = XFontsOfFontSet(set, &xfonts, &font_names);
1848         for(i = 0; i < n; i++) {
1849                 *ascent = MAX(*ascent, (*xfonts)->ascent);
1850                 *descent = MAX(*descent, (*xfonts)->descent);
1851                 *lbearing = MAX(*lbearing, (*xfonts)->min_bounds.lbearing);
1852                 *rbearing = MAX(*rbearing, (*xfonts)->max_bounds.rbearing);
1853                 xfonts++;
1854         }
1855 }
1856
1857 void
1858 initfonts(char *fontstr, char *bfontstr) {
1859         if((dc.font.set = xinitfont(fontstr)) == NULL ||
1860            (dc.bfont.set = xinitfont(bfontstr)) == NULL)
1861                 die("Can't load font %s\n", dc.font.set ? BOLDFONT : FONT);
1862         xgetfontinfo(dc.font.set, &dc.font.ascent, &dc.font.descent,
1863             &dc.font.lbearing, &dc.font.rbearing);
1864         xgetfontinfo(dc.bfont.set, &dc.bfont.ascent, &dc.bfont.descent,
1865             &dc.bfont.lbearing, &dc.bfont.rbearing);
1866 }
1867
1868 void
1869 xinit(void) {
1870         XSetWindowAttributes attrs;
1871         Cursor cursor;
1872         Window parent;
1873
1874         if(!(xw.dpy = XOpenDisplay(NULL)))
1875                 die("Can't open display\n");
1876         xw.scr = XDefaultScreen(xw.dpy);
1877
1878         /* font */
1879         initfonts(FONT, BOLDFONT);
1880
1881         /* XXX: Assuming same size for bold font */
1882         xw.cw = dc.font.rbearing - dc.font.lbearing;
1883         xw.ch = dc.font.ascent + dc.font.descent;
1884
1885         /* colors */
1886         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
1887         xloadcols();
1888
1889         /* window - default size */
1890         xw.h = 2*BORDER + term.row * xw.ch;
1891         xw.w = 2*BORDER + term.col * xw.cw;
1892
1893         attrs.background_pixel = dc.col[DefaultBG];
1894         attrs.border_pixel = dc.col[DefaultBG];
1895         attrs.bit_gravity = NorthWestGravity;
1896         attrs.event_mask = FocusChangeMask | KeyPressMask
1897                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
1898                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask
1899                 | EnterWindowMask | LeaveWindowMask;
1900         attrs.colormap = xw.cmap;
1901
1902         parent = opt_embed ? strtol(opt_embed, NULL, 0) : XRootWindow(xw.dpy, xw.scr);
1903         xw.win = XCreateWindow(xw.dpy, parent, 0, 0,
1904                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
1905                         XDefaultVisual(xw.dpy, xw.scr),
1906                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
1907                         | CWColormap,
1908                         &attrs);
1909         xw.buf = XdbeAllocateBackBufferName(xw.dpy, xw.win, XdbeCopied);
1910
1911
1912         /* input methods */
1913         xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
1914         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
1915                                            | XIMStatusNothing, XNClientWindow, xw.win,
1916                                            XNFocusWindow, xw.win, NULL);
1917         /* gc */
1918         dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
1919
1920         /* white cursor, black outline */
1921         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
1922         XDefineCursor(xw.dpy, xw.win, cursor);
1923         XRecolorCursor(xw.dpy, cursor,
1924                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
1925                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
1926
1927         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
1928
1929         XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
1930         XMapWindow(xw.dpy, xw.win);
1931         xhints();
1932         XSync(xw.dpy, 0);
1933 }
1934
1935 void
1936 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
1937         int fg = base.fg, bg = base.bg, temp;
1938         int winx = BORDER+x*xw.cw, winy = BORDER+y*xw.ch + dc.font.ascent, width = charlen*xw.cw;
1939         XFontSet fontset = dc.font.set;
1940         int i;
1941
1942         /* only switch default fg/bg if term is in RV mode */
1943         if(IS_SET(MODE_REVERSE)) {
1944                 if(fg == DefaultFG)
1945                         fg = DefaultBG;
1946                 if(bg == DefaultBG)
1947                         bg = DefaultFG;
1948         }
1949
1950         if(base.mode & ATTR_REVERSE)
1951                 temp = fg, fg = bg, bg = temp;
1952
1953         if(base.mode & ATTR_BOLD) {
1954                 fg += 8;
1955                 fontset = dc.bfont.set;
1956         }
1957
1958         XSetBackground(xw.dpy, dc.gc, dc.col[bg]);
1959         XSetForeground(xw.dpy, dc.gc, dc.col[fg]);
1960
1961         if(base.mode & ATTR_GFX) {
1962                 for(i = 0; i < bytelen; i++) {
1963                         char c = gfx[(uint)s[i] % 256];
1964                         if(c)
1965                                 s[i] = c;
1966                         else if(s[i] > 0x5f)
1967                                 s[i] -= 0x5f;
1968                 }
1969         }
1970
1971         XmbDrawImageString(xw.dpy, xw.buf, fontset, dc.gc, winx, winy, s, bytelen);
1972
1973         if(base.mode & ATTR_UNDERLINE)
1974                 XDrawLine(xw.dpy, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1975 }
1976
1977 /* copy buffer pixmap to screen pixmap */
1978 void
1979 xcopy() {
1980         XdbeSwapInfo swpinfo[1] = {{xw.win, XdbeCopied}};
1981         XdbeSwapBuffers(xw.dpy, swpinfo, 1);
1982
1983 }
1984
1985 void
1986 xdrawcursor(void) {
1987         static int oldx = 0;
1988         static int oldy = 0;
1989         int sl;
1990         Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
1991
1992         LIMIT(oldx, 0, term.col-1);
1993         LIMIT(oldy, 0, term.row-1);
1994
1995         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1996                 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
1997
1998         /* remove the old cursor */
1999         if(term.line[oldy][oldx].state & GLYPH_SET) {
2000                 sl = utf8size(term.line[oldy][oldx].c);
2001                 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1, sl);
2002         } else
2003                 xclear(oldx, oldy, oldx, oldy);
2004
2005         xcopy(oldx, oldy, 1, 1);
2006
2007         /* draw the new one */
2008         if(!(term.c.state & CURSOR_HIDE)) {
2009                 if(!(xw.state & WIN_FOCUSED))
2010                         g.bg = DefaultUCS;
2011
2012                 if(IS_SET(MODE_REVERSE))
2013                         g.mode |= ATTR_REVERSE, g.fg = DefaultCS, g.bg = DefaultFG;
2014
2015                 sl = utf8size(g.c);
2016                 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
2017                 oldx = term.c.x, oldy = term.c.y;
2018         }
2019
2020         xcopy(term.c.x, term.c.y, 1, 1);
2021 }
2022
2023 void
2024 draw() {
2025         drawregion(0, 0, term.col, term.row);
2026         xcopy();
2027         gettimeofday(&xw.lastdraw, NULL);
2028 }
2029
2030 void
2031 drawregion(int x1, int y1, int x2, int y2) {
2032         int ic, ib, x, y, ox, sl;
2033         Glyph base, new;
2034         char buf[DRAW_BUF_SIZ];
2035
2036         if(!(xw.state & WIN_VISIBLE))
2037                 return;
2038
2039         for(y = y1; y < y2; y++) {
2040                 if(!term.dirty[y])
2041                         continue;
2042                 xclear(0, y, term.col, y);
2043                 term.dirty[y] = 0;
2044                 base = term.line[y][0];
2045                 ic = ib = ox = 0;
2046                 for(x = x1; x < x2; x++) {
2047                         new = term.line[y][x];
2048                         if(sel.bx != -1 && *(new.c) && selected(x, y))
2049                                 new.mode ^= ATTR_REVERSE;
2050                         if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
2051                                                   ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
2052                                 xdraws(buf, base, ox, y, ic, ib);
2053                                 ic = ib = 0;
2054                         }
2055                         if(new.state & GLYPH_SET) {
2056                                 if(ib == 0) {
2057                                         ox = x;
2058                                         base = new;
2059                                 }
2060                                 sl = utf8size(new.c);
2061                                 memcpy(buf+ib, new.c, sl);
2062                                 ib += sl;
2063                                 ++ic;
2064                         }
2065                 }
2066                 if(ib > 0)
2067                         xdraws(buf, base, ox, y, ic, ib);
2068         }
2069         xdrawcursor();
2070 }
2071
2072 void
2073 expose(XEvent *ev) {
2074         XExposeEvent *e = &ev->xexpose;
2075         if(xw.state & WIN_REDRAW) {
2076                 if(!e->count)
2077                         xw.state &= ~WIN_REDRAW;
2078         }
2079         xcopy();
2080 }
2081
2082 void
2083 visibility(XEvent *ev) {
2084         XVisibilityEvent *e = &ev->xvisibility;
2085         if(e->state == VisibilityFullyObscured)
2086                 xw.state &= ~WIN_VISIBLE;
2087         else if(!(xw.state & WIN_VISIBLE))
2088                 /* need a full redraw for next Expose, not just a buf copy */
2089                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
2090 }
2091
2092 void
2093 unmap(XEvent *ev) {
2094         xw.state &= ~WIN_VISIBLE;
2095 }
2096
2097 void
2098 xseturgency(int add) {
2099         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
2100         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
2101         XSetWMHints(xw.dpy, xw.win, h);
2102         XFree(h);
2103 }
2104
2105 void
2106 focus(XEvent *ev) {
2107         if(ev->type == FocusIn) {
2108                 xw.state |= WIN_FOCUSED;
2109                 xseturgency(0);
2110         } else
2111                 xw.state &= ~WIN_FOCUSED;
2112         draw();
2113 }
2114
2115 char*
2116 kmap(KeySym k, uint state) {
2117         int i;
2118         state &= ~Mod2Mask;
2119         for(i = 0; i < LEN(key); i++) {
2120                 uint mask = key[i].mask;
2121                 if(key[i].k == k && ((state & mask) == mask || (mask == XK_NO_MOD && !state)))
2122                         return (char*)key[i].s;
2123         }
2124         return NULL;
2125 }
2126
2127 void
2128 kpress(XEvent *ev) {
2129         XKeyEvent *e = &ev->xkey;
2130         KeySym ksym;
2131         char buf[32];
2132         char *customkey;
2133         int len;
2134         int meta;
2135         int shift;
2136         Status status;
2137
2138         meta = e->state & Mod1Mask;
2139         shift = e->state & ShiftMask;
2140         len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
2141
2142         /* 1. custom keys from config.h */
2143         if((customkey = kmap(ksym, e->state)))
2144                 ttywrite(customkey, strlen(customkey));
2145         /* 2. hardcoded (overrides X lookup) */
2146         else
2147                 switch(ksym) {
2148                 case XK_Up:
2149                 case XK_Down:
2150                 case XK_Left:
2151                 case XK_Right:
2152                         /* XXX: shift up/down doesn't work */
2153                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', (shift ? "dacb":"DACB")[ksym - XK_Left]);
2154                         ttywrite(buf, 3);
2155                         break;
2156                 case XK_Insert:
2157                         if(shift)
2158                                 selpaste();
2159                         break;
2160                 case XK_Return:
2161                         if(IS_SET(MODE_CRLF))
2162                                 ttywrite("\r\n", 2);
2163                         else
2164                                 ttywrite("\r", 1);
2165                         break;
2166                         /* 3. X lookup  */
2167                 default:
2168                         if(len > 0) {
2169                                 if(meta && len == 1)
2170                                         ttywrite("\033", 1);
2171                                 ttywrite(buf, len);
2172                         }
2173                         break;
2174                 }
2175 }
2176
2177 void
2178 cmessage(XEvent *e) {
2179         /* See xembed specs
2180            http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html */
2181         if (e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
2182                 if (e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
2183                         xw.state |= WIN_FOCUSED;
2184                         xseturgency(0);
2185                 } else if (e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
2186                         xw.state &= ~WIN_FOCUSED;
2187                 }
2188                 draw();
2189         }
2190 }
2191
2192 void
2193 resize(XEvent *e) {
2194         int col, row;
2195
2196         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
2197                 return;
2198
2199         xw.w = e->xconfigure.width;
2200         xw.h = e->xconfigure.height;
2201         col = (xw.w - 2*BORDER) / xw.cw;
2202         row = (xw.h - 2*BORDER) / xw.ch;
2203         if(col == term.col && row == term.row)
2204                 return;
2205         if(tresize(col, row))
2206                 draw();
2207         ttyresize(col, row);
2208         xresize(col, row);
2209 }
2210
2211 bool
2212 last_draw_too_old(void) {
2213         struct timeval now;
2214         gettimeofday(&now, NULL);
2215         return TIMEDIFF(now, xw.lastdraw) >= DRAW_TIMEOUT/1000;
2216 }
2217
2218 void
2219 run(void) {
2220         XEvent ev;
2221         fd_set rfd;
2222         int xfd = XConnectionNumber(xw.dpy);
2223         struct timeval timeout = {0};
2224         bool stuff_to_print = 0;
2225
2226         for(;;) {
2227                 FD_ZERO(&rfd);
2228                 FD_SET(cmdfd, &rfd);
2229                 FD_SET(xfd, &rfd);
2230                 timeout.tv_sec  = 0;
2231                 timeout.tv_usec = SELECT_TIMEOUT;
2232                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, &timeout) < 0) {
2233                         if(errno == EINTR)
2234                                 continue;
2235                         die("select failed: %s\n", SERRNO);
2236                 }
2237                 if(FD_ISSET(cmdfd, &rfd)) {
2238                         ttyread();
2239                         stuff_to_print = 1;
2240                 }
2241
2242                 if(stuff_to_print && last_draw_too_old()) {
2243                         stuff_to_print = 0;
2244                         draw();
2245                 }
2246
2247                 while(XPending(xw.dpy)) {
2248                         XNextEvent(xw.dpy, &ev);
2249                         if(XFilterEvent(&ev, xw.win))
2250                                 continue;
2251                         if(handler[ev.type])
2252                                 (handler[ev.type])(&ev);
2253                 }
2254         }
2255 }
2256
2257 int
2258 main(int argc, char *argv[]) {
2259         int i;
2260
2261         for(i = 1; i < argc; i++) {
2262                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
2263                 case 't':
2264                         if(++i < argc) opt_title = argv[i];
2265                         break;
2266                 case 'c':
2267                         if(++i < argc) opt_class = argv[i];
2268                         break;
2269                 case 'w':
2270                         if(++i < argc) opt_embed = argv[i];
2271                         break;
2272                 case 'e':
2273                         /* eat every remaining arguments */
2274                         if(++i < argc) opt_cmd = &argv[i];
2275                         goto run;
2276                 case 'v':
2277                 default:
2278                         die(USAGE);
2279                 }
2280         }
2281
2282  run:
2283         setlocale(LC_CTYPE, "");
2284         tnew(80, 24);
2285         ttynew();
2286         xinit();
2287         selinit();
2288         run();
2289         return 0;
2290 }