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