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