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