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