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