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