1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 #include <thread.h>
5 #include <cursor.h>
6 #include <mouse.h>
7 #include <keyboard.h>
8 #include <frame.h>
9 #include <fcall.h>
10 #include <plumb.h>
11 #include "dat.h"
12 #include "fns.h"
13 
14 enum
15 {
16 	Ctlsize	= 5*12
17 };
18 
19 char	Edel[]		= "deleted window";
20 char	Ebadctl[]		= "ill-formed control message";
21 char	Ebadaddr[]	= "bad address syntax";
22 char	Eaddr[]		= "address out of range";
23 char	Einuse[]		= "already in use";
24 char	Ebadevent[]	= "bad event syntax";
25 extern char Eperm[];
26 
27 static
28 void
29 clampaddr(Window *w)
30 {
31 	if(w->addr.q0 < 0)
32 		w->addr.q0 = 0;
33 	if(w->addr.q1 < 0)
34 		w->addr.q1 = 0;
35 	if(w->addr.q0 > w->body.file->b.nc)
36 		w->addr.q0 = w->body.file->b.nc;
37 	if(w->addr.q1 > w->body.file->b.nc)
38 		w->addr.q1 = w->body.file->b.nc;
39 }
40 
41 void
42 xfidctl(void *arg)
43 {
44 	Xfid *x;
45 	void (*f)(Xfid*);
46 
47 	threadsetname("xfidctlthread");
48 	x = arg;
49 	for(;;){
50 		f = (void(*)(Xfid*))recvp(x->c);
51 		(*f)(x);
52 		flushimage(display, 1);
53 		sendp(cxfidfree, x);
54 	}
55 }
56 
57 void
58 xfidflush(Xfid *x)
59 {
60 	Fcall fc;
61 	int i, j;
62 	Window *w;
63 	Column *c;
64 	Xfid *wx;
65 
66 	/* search windows for matching tag */
67 	qlock(&row.lk);
68 	for(j=0; j<row.ncol; j++){
69 		c = row.col[j];
70 		for(i=0; i<c->nw; i++){
71 			w = c->w[i];
72 			winlock(w, 'E');
73 			wx = w->eventx;
74 			if(wx!=nil && wx->fcall.tag==x->fcall.oldtag){
75 				w->eventx = nil;
76 				wx->flushed = TRUE;
77 				sendp(wx->c, nil);
78 				winunlock(w);
79 				goto out;
80 			}
81 			winunlock(w);
82 		}
83 	}
84 out:
85 	qunlock(&row.lk);
86 	respond(x, &fc, nil);
87 }
88 
89 void
90 xfidopen(Xfid *x)
91 {
92 	Fcall fc;
93 	Window *w;
94 	Text *t;
95 	char *s;
96 	Rune *r;
97 	int m, n, q, q0, q1;
98 
99 	w = x->f->w;
100 	t = &w->body;
101 	q = FILE(x->f->qid);
102 	if(w){
103 		winlock(w, 'E');
104 		switch(q){
105 		case QWaddr:
106 			if(w->nopen[q]++ == 0){
107 				w->addr = range(0, 0);
108 				w->limit = range(-1,-1);
109 			}
110 			break;
111 		case QWdata:
112 		case QWxdata:
113 			w->nopen[q]++;
114 			break;
115 		case QWevent:
116 			if(w->nopen[q]++ == 0){
117 				if(!w->isdir && w->col!=nil){
118 					w->filemenu = FALSE;
119 					winsettag(w);
120 				}
121 			}
122 			break;
123 		case QWrdsel:
124 			/*
125 			 * Use a temporary file.
126 			 * A pipe would be the obvious, but we can't afford the
127 			 * broken pipe notification.  Using the code to read QWbody
128 			 * is n², which should probably also be fixed.  Even then,
129 			 * though, we'd need to squirrel away the data in case it's
130 			 * modified during the operation, e.g. by |sort
131 			 */
132 			if(w->rdselfd > 0){
133 				winunlock(w);
134 				respond(x, &fc, Einuse);
135 				return;
136 			}
137 			w->rdselfd = tempfile();
138 			if(w->rdselfd < 0){
139 				winunlock(w);
140 				respond(x, &fc, "can't create temp file");
141 				return;
142 			}
143 			w->nopen[q]++;
144 			q0 = t->q0;
145 			q1 = t->q1;
146 			r = fbufalloc();
147 			s = fbufalloc();
148 			while(q0 < q1){
149 				n = q1 - q0;
150 				if(n > BUFSIZE/UTFmax)
151 					n = BUFSIZE/UTFmax;
152 				bufread(&t->file->b, q0, r, n);
153 				m = snprint(s, BUFSIZE+1, "%.*S", n, r);
154 				if(write(w->rdselfd, s, m) != m){
155 					warning(nil, "can't write temp file for pipe command %r\n");
156 					break;
157 				}
158 				q0 += n;
159 			}
160 			fbuffree(s);
161 			fbuffree(r);
162 			break;
163 		case QWwrsel:
164 			w->nopen[q]++;
165 			seq++;
166 			filemark(t->file);
167 			cut(t, t, nil, FALSE, TRUE, nil, 0);
168 			w->wrselrange = range(t->q1, t->q1);
169 			w->nomark = TRUE;
170 			break;
171 		case QWeditout:
172 			if(editing == FALSE){
173 				winunlock(w);
174 				respond(x, &fc, Eperm);
175 				return;
176 			}
177 			if(!canqlock(&w->editoutlk)){
178 				winunlock(w);
179 				respond(x, &fc, Einuse);
180 				return;
181 			}
182 			w->wrselrange = range(t->q1, t->q1);
183 			break;
184 		}
185 		winunlock(w);
186 	}
187 	else{
188 		switch(q){
189 		case Qeditout:
190 			if(!canqlock(&editoutlk)){
191 				respond(x, &fc, Einuse);
192 				return;
193 			}
194 			break;
195 		}
196 	}
197 	fc.qid = x->f->qid;
198 	fc.iounit = messagesize-IOHDRSZ;
199 	x->f->open = TRUE;
200 	respond(x, &fc, nil);
201 }
202 
203 void
204 xfidclose(Xfid *x)
205 {
206 	Fcall fc;
207 	Window *w;
208 	int q;
209 	Text *t;
210 
211 	w = x->f->w;
212 	x->f->busy = FALSE;
213 	x->f->w = nil;
214 	if(x->f->open == FALSE){
215 		if(w != nil)
216 			winclose(w);
217 		respond(x, &fc, nil);
218 		return;
219 	}
220 
221 	q = FILE(x->f->qid);
222 	x->f->open = FALSE;
223 	if(w){
224 		winlock(w, 'E');
225 		switch(q){
226 		case QWctl:
227 			if(w->ctlfid!=~0 && w->ctlfid==x->f->fid){
228 				w->ctlfid = ~0;
229 				qunlock(&w->ctllock);
230 			}
231 			break;
232 		case QWdata:
233 		case QWxdata:
234 			w->nomark = FALSE;
235 			/* fall through */
236 		case QWaddr:
237 		case QWevent:	/* BUG: do we need to shut down Xfid? */
238 			if(--w->nopen[q] == 0){
239 				if(q == QWdata || q == QWxdata)
240 					w->nomark = FALSE;
241 				if(q==QWevent && !w->isdir && w->col!=nil){
242 					w->filemenu = TRUE;
243 					winsettag(w);
244 				}
245 				if(q == QWevent){
246 					free(w->dumpstr);
247 					free(w->dumpdir);
248 					w->dumpstr = nil;
249 					w->dumpdir = nil;
250 				}
251 			}
252 			break;
253 		case QWrdsel:
254 			close(w->rdselfd);
255 			w->rdselfd = 0;
256 			break;
257 		case QWwrsel:
258 			w->nomark = FALSE;
259 			t = &w->body;
260 			/* before: only did this if !w->noscroll, but that didn't seem right in practice */
261 			textshow(t, min(w->wrselrange.q0, t->file->b.nc),
262 				min(w->wrselrange.q1, t->file->b.nc), 1);
263 			textscrdraw(t);
264 			break;
265 		case QWeditout:
266 			qunlock(&w->editoutlk);
267 			break;
268 		}
269 		winunlock(w);
270 		winclose(w);
271 	}
272 	else{
273 		switch(q){
274 		case Qeditout:
275 			qunlock(&editoutlk);
276 			break;
277 		}
278 	}
279 	respond(x, &fc, nil);
280 }
281 
282 void
283 xfidread(Xfid *x)
284 {
285 	Fcall fc;
286 	int n, q;
287 	uint off;
288 	char *b;
289 	char buf[256];
290 	Window *w;
291 
292 	q = FILE(x->f->qid);
293 	w = x->f->w;
294 	if(w == nil){
295 		fc.count = 0;
296 		switch(q){
297 		case Qcons:
298 		case Qlabel:
299 			break;
300 		case Qindex:
301 			xfidindexread(x);
302 			return;
303 		default:
304 			warning(nil, "unknown qid %d\n", q);
305 			break;
306 		}
307 		respond(x, &fc, nil);
308 		return;
309 	}
310 	winlock(w, 'F');
311 	if(w->col == nil){
312 		winunlock(w);
313 		respond(x, &fc, Edel);
314 		return;
315 	}
316 	off = x->fcall.offset;
317 	switch(q){
318 	case QWaddr:
319 		textcommit(&w->body, TRUE);
320 		clampaddr(w);
321 		sprint(buf, "%11d %11d ", w->addr.q0, w->addr.q1);
322 		goto Readbuf;
323 
324 	case QWbody:
325 		xfidutfread(x, &w->body, w->body.file->b.nc, QWbody);
326 		break;
327 
328 	case QWctl:
329 		b = winctlprint(w, buf, 1);
330 		goto Readb;
331 
332 	Readbuf:
333 		b = buf;
334 	Readb:
335 		n = strlen(b);
336 		if(off > n)
337 			off = n;
338 		if(off+x->fcall.count > n)
339 			x->fcall.count = n-off;
340 		fc.count = x->fcall.count;
341 		fc.data = b+off;
342 		respond(x, &fc, nil);
343 		if(b != buf)
344 			free(b);
345 		break;
346 
347 	case QWevent:
348 		xfideventread(x, w);
349 		break;
350 
351 	case QWdata:
352 		/* BUG: what should happen if q1 > q0? */
353 		if(w->addr.q0 > w->body.file->b.nc){
354 			respond(x, &fc, Eaddr);
355 			break;
356 		}
357 		w->addr.q0 += xfidruneread(x, &w->body, w->addr.q0, w->body.file->b.nc);
358 		w->addr.q1 = w->addr.q0;
359 		break;
360 
361 	case QWxdata:
362 		/* BUG: what should happen if q1 > q0? */
363 		if(w->addr.q0 > w->body.file->b.nc){
364 			respond(x, &fc, Eaddr);
365 			break;
366 		}
367 		w->addr.q0 += xfidruneread(x, &w->body, w->addr.q0, w->addr.q1);
368 		break;
369 
370 	case QWtag:
371 		xfidutfread(x, &w->tag, w->tag.file->b.nc, QWtag);
372 		break;
373 
374 	case QWrdsel:
375 		seek(w->rdselfd, off, 0);
376 		n = x->fcall.count;
377 		if(n > BUFSIZE)
378 			n = BUFSIZE;
379 		b = fbufalloc();
380 		n = read(w->rdselfd, b, n);
381 		if(n < 0){
382 			respond(x, &fc, "I/O error in temp file");
383 			break;
384 		}
385 		fc.count = n;
386 		fc.data = b;
387 		respond(x, &fc, nil);
388 		fbuffree(b);
389 		break;
390 
391 	default:
392 		sprint(buf, "unknown qid %d in read", q);
393 		respond(x, &fc, nil);
394 	}
395 	winunlock(w);
396 }
397 
398 static int
399 shouldscroll(Text *t, uint q0, int qid)
400 {
401 	if(qid == Qcons)
402 		return TRUE;
403 	return t->org <= q0 && q0 <= t->org+t->fr.nchars;
404 }
405 
406 void
407 xfidwrite(Xfid *x)
408 {
409 	Fcall fc;
410 	int c, cnt, qid, q, nb, nr, eval;
411 	char buf[64], *err;
412 	Window *w;
413 	Rune *r;
414 	Range a;
415 	Text *t;
416 	uint q0, tq0, tq1;
417 
418 	qid = FILE(x->f->qid);
419 	w = x->f->w;
420 	if(w){
421 		c = 'F';
422 		if(qid==QWtag || qid==QWbody)
423 			c = 'E';
424 		winlock(w, c);
425 		if(w->col == nil){
426 			winunlock(w);
427 			respond(x, &fc, Edel);
428 			return;
429 		}
430 	}
431 	x->fcall.data[x->fcall.count] = 0;
432 	switch(qid){
433 	case Qcons:
434 		w = errorwin(x->f->mntdir, 'X');
435 		t=&w->body;
436 		goto BodyTag;
437 
438 	case Qlabel:
439 		fc.count = x->fcall.count;
440 		respond(x, &fc, nil);
441 		break;
442 
443 	case QWaddr:
444 		x->fcall.data[x->fcall.count] = 0;
445 		r = bytetorune(x->fcall.data, &nr);
446 		t = &w->body;
447 		wincommit(w, t);
448 		eval = TRUE;
449 		a = address(FALSE, t, w->limit, w->addr, r, 0, nr, rgetc, &eval, (uint*)&nb);
450 		free(r);
451 		if(nb < nr){
452 			respond(x, &fc, Ebadaddr);
453 			break;
454 		}
455 		if(!eval){
456 			respond(x, &fc, Eaddr);
457 			break;
458 		}
459 		w->addr = a;
460 		fc.count = x->fcall.count;
461 		respond(x, &fc, nil);
462 		break;
463 
464 	case Qeditout:
465 	case QWeditout:
466 		r = bytetorune(x->fcall.data, &nr);
467 		if(w)
468 			err = edittext(w, w->wrselrange.q1, r, nr);
469 		else
470 			err = edittext(nil, 0, r, nr);
471 		free(r);
472 		if(err != nil){
473 			respond(x, &fc, err);
474 			break;
475 		}
476 		fc.count = x->fcall.count;
477 		respond(x, &fc, nil);
478 		break;
479 
480 	case QWerrors:
481 		w = errorwinforwin(w);
482 		t = &w->body;
483 		goto BodyTag;
484 
485 	case QWbody:
486 	case QWwrsel:
487 		t = &w->body;
488 		goto BodyTag;
489 
490 	case QWctl:
491 		xfidctlwrite(x, w);
492 		break;
493 
494 	case QWdata:
495 		a = w->addr;
496 		t = &w->body;
497 		wincommit(w, t);
498 		if(a.q0>t->file->b.nc || a.q1>t->file->b.nc){
499 			respond(x, &fc, Eaddr);
500 			break;
501 		}
502 		r = runemalloc(x->fcall.count);
503 		cvttorunes(x->fcall.data, x->fcall.count, r, &nb, &nr, nil);
504 		if(w->nomark == FALSE){
505 			seq++;
506 			filemark(t->file);
507 		}
508 		q0 = a.q0;
509 		if(a.q1 > q0){
510 			textdelete(t, q0, a.q1, TRUE);
511 			w->addr.q1 = q0;
512 		}
513 		tq0 = t->q0;
514 		tq1 = t->q1;
515 		textinsert(t, q0, r, nr, TRUE);
516 		if(tq0 >= q0)
517 			tq0 += nr;
518 		if(tq1 >= q0)
519 			tq1 += nr;
520 		textsetselect(t, tq0, tq1);
521 		if(shouldscroll(t, q0, qid))
522 			textshow(t, q0+nr, q0+nr, 0);
523 		textscrdraw(t);
524 		winsettag(w);
525 		free(r);
526 		w->addr.q0 += nr;
527 		w->addr.q1 = w->addr.q0;
528 		fc.count = x->fcall.count;
529 		respond(x, &fc, nil);
530 		break;
531 
532 	case QWevent:
533 		xfideventwrite(x, w);
534 		break;
535 
536 	case QWtag:
537 		t = &w->tag;
538 		goto BodyTag;
539 
540 	BodyTag:
541 		q = x->f->nrpart;
542 		cnt = x->fcall.count;
543 		if(q > 0){
544 			memmove(x->fcall.data+q, x->fcall.data, cnt);	/* there's room; see fsysproc */
545 			memmove(x->fcall.data, x->f->rpart, q);
546 			cnt += q;
547 			x->f->nrpart = 0;
548 		}
549 		r = runemalloc(cnt);
550 		cvttorunes(x->fcall.data, cnt-UTFmax, r, &nb, &nr, nil);
551 		/* approach end of buffer */
552 		while(fullrune(x->fcall.data+nb, cnt-nb)){
553 			c = nb;
554 			nb += chartorune(&r[nr], x->fcall.data+c);
555 			if(r[nr])
556 				nr++;
557 		}
558 		if(nb < cnt){
559 			memmove(x->f->rpart, x->fcall.data+nb, cnt-nb);
560 			x->f->nrpart = cnt-nb;
561 		}
562 		if(nr > 0){
563 			wincommit(w, t);
564 			if(qid == QWwrsel){
565 				q0 = w->wrselrange.q1;
566 				if(q0 > t->file->b.nc)
567 					q0 = t->file->b.nc;
568 			}else
569 				q0 = t->file->b.nc;
570 			if(qid == QWtag)
571 				textinsert(t, q0, r, nr, TRUE);
572 			else{
573 				if(w->nomark == FALSE){
574 					seq++;
575 					filemark(t->file);
576 				}
577 				q0 = textbsinsert(t, q0, r, nr, TRUE, &nr);
578 				textsetselect(t, t->q0, t->q1);	/* insert could leave it somewhere else */
579 				if(qid!=QWwrsel && shouldscroll(t, q0, qid))
580 					textshow(t, q0+nr, q0+nr, 1);
581 				textscrdraw(t);
582 			}
583 			winsettag(w);
584 			if(qid == QWwrsel)
585 				w->wrselrange.q1 += nr;
586 			free(r);
587 		}
588 		fc.count = x->fcall.count;
589 		respond(x, &fc, nil);
590 		break;
591 
592 	default:
593 		sprint(buf, "unknown qid %d in write", qid);
594 		respond(x, &fc, buf);
595 		break;
596 	}
597 	if(w)
598 		winunlock(w);
599 }
600 
601 void
602 xfidctlwrite(Xfid *x, Window *w)
603 {
604 	Fcall fc;
605 	int i, m, n, nb, nr, nulls;
606 	Rune *r;
607 	char *err, *p, *pp, *q, *e;
608 	int isfbuf, scrdraw, settag;
609 	Text *t;
610 
611 	err = nil;
612 	e = x->fcall.data+x->fcall.count;
613 	scrdraw = FALSE;
614 	settag = FALSE;
615 	isfbuf = TRUE;
616 	if(x->fcall.count < RBUFSIZE)
617 		r = fbufalloc();
618 	else{
619 		isfbuf = FALSE;
620 		r = emalloc(x->fcall.count*UTFmax+1);
621 	}
622 	x->fcall.data[x->fcall.count] = 0;
623 	textcommit(&w->tag, TRUE);
624 	for(n=0; n<x->fcall.count; n+=m){
625 		p = x->fcall.data+n;
626 		if(strncmp(p, "lock", 4) == 0){	/* make window exclusive use */
627 			qlock(&w->ctllock);
628 			w->ctlfid = x->f->fid;
629 			m = 4;
630 		}else
631 		if(strncmp(p, "unlock", 6) == 0){	/* release exclusive use */
632 			w->ctlfid = ~0;
633 			qunlock(&w->ctllock);
634 			m = 6;
635 		}else
636 		if(strncmp(p, "clean", 5) == 0){	/* mark window 'clean', seq=0 */
637 			t = &w->body;
638 			t->eq0 = ~0;
639 			filereset(t->file);
640 			t->file->mod = FALSE;
641 			w->dirty = FALSE;
642 			settag = TRUE;
643 			m = 5;
644 		}else
645 		if(strncmp(p, "dirty", 5) == 0){	/* mark window 'dirty' */
646 			t = &w->body;
647 			/* doesn't change sequence number, so "Put" won't appear.  it shouldn't. */
648 			t->file->mod = TRUE;
649 			w->dirty = TRUE;
650 			settag = TRUE;
651 			m = 5;
652 		}else
653 		if(strncmp(p, "show", 4) == 0){	/* show dot */
654 			t = &w->body;
655 			textshow(t, t->q0, t->q1, 1);
656 			m = 4;
657 		}else
658 		if(strncmp(p, "name ", 5) == 0){	/* set file name */
659 			pp = p+5;
660 			m = 5;
661 			q = memchr(pp, '\n', e-pp);
662 			if(q==nil || q==pp){
663 				err = Ebadctl;
664 				break;
665 			}
666 			*q = 0;
667 			nulls = FALSE;
668 			cvttorunes(pp, q-pp, r, &nb, &nr, &nulls);
669 			if(nulls){
670 				err = "nulls in file name";
671 				break;
672 			}
673 			for(i=0; i<nr; i++)
674 				if(r[i] <= ' '){
675 					err = "bad character in file name";
676 					goto out;
677 				}
678 out:
679 			seq++;
680 			filemark(w->body.file);
681 			winsetname(w, r, nr);
682 			m += (q+1) - pp;
683 		}else
684 		if(strncmp(p, "dump ", 5) == 0){	/* set dump string */
685 			pp = p+5;
686 			m = 5;
687 			q = memchr(pp, '\n', e-pp);
688 			if(q==nil || q==pp){
689 				err = Ebadctl;
690 				break;
691 			}
692 			*q = 0;
693 			nulls = FALSE;
694 			cvttorunes(pp, q-pp, r, &nb, &nr, &nulls);
695 			if(nulls){
696 				err = "nulls in dump string";
697 				break;
698 			}
699 			w->dumpstr = runetobyte(r, nr);
700 			m += (q+1) - pp;
701 		}else
702 		if(strncmp(p, "dumpdir ", 8) == 0){	/* set dump directory */
703 			pp = p+8;
704 			m = 8;
705 			q = memchr(pp, '\n', e-pp);
706 			if(q==nil || q==pp){
707 				err = Ebadctl;
708 				break;
709 			}
710 			*q = 0;
711 			nulls = FALSE;
712 			cvttorunes(pp, q-pp, r, &nb, &nr, &nulls);
713 			if(nulls){
714 				err = "nulls in dump directory string";
715 				break;
716 			}
717 			w->dumpdir = runetobyte(r, nr);
718 			m += (q+1) - pp;
719 		}else
720 		if(strncmp(p, "delete", 6) == 0){	/* delete for sure */
721 			colclose(w->col, w, TRUE);
722 			m = 6;
723 		}else
724 		if(strncmp(p, "del", 3) == 0){	/* delete, but check dirty */
725 			if(!winclean(w, TRUE)){
726 				err = "file dirty";
727 				break;
728 			}
729 			colclose(w->col, w, TRUE);
730 			m = 3;
731 		}else
732 		if(strncmp(p, "get", 3) == 0){	/* get file */
733 			get(&w->body, nil, nil, FALSE, XXX, nil, 0);
734 			m = 3;
735 		}else
736 		if(strncmp(p, "put", 3) == 0){	/* put file */
737 			put(&w->body, nil, nil, XXX, XXX, nil, 0);
738 			m = 3;
739 		}else
740 		if(strncmp(p, "dot=addr", 8) == 0){	/* set dot */
741 			textcommit(&w->body, TRUE);
742 			clampaddr(w);
743 			w->body.q0 = w->addr.q0;
744 			w->body.q1 = w->addr.q1;
745 			textsetselect(&w->body, w->body.q0, w->body.q1);
746 			settag = TRUE;
747 			m = 8;
748 		}else
749 		if(strncmp(p, "addr=dot", 8) == 0){	/* set addr */
750 			w->addr.q0 = w->body.q0;
751 			w->addr.q1 = w->body.q1;
752 			m = 8;
753 		}else
754 		if(strncmp(p, "limit=addr", 10) == 0){	/* set limit */
755 			textcommit(&w->body, TRUE);
756 			clampaddr(w);
757 			w->limit.q0 = w->addr.q0;
758 			w->limit.q1 = w->addr.q1;
759 			m = 10;
760 		}else
761 		if(strncmp(p, "nomark", 6) == 0){	/* turn off automatic marking */
762 			w->nomark = TRUE;
763 			m = 6;
764 		}else
765 		if(strncmp(p, "mark", 4) == 0){	/* mark file */
766 			seq++;
767 			filemark(w->body.file);
768 			settag = TRUE;
769 			m = 4;
770 		}else
771 		if(strncmp(p, "nomenu", 6) == 0){	/* turn off automatic menu */
772 			w->filemenu = FALSE;
773 			m = 6;
774 		}else
775 		if(strncmp(p, "menu", 4) == 0){	/* enable automatic menu */
776 			w->filemenu = TRUE;
777 			m = 4;
778 		}else
779 		if(strncmp(p, "cleartag", 8) == 0){	/* wipe tag right of bar */
780 			wincleartag(w);
781 			settag = TRUE;
782 			m = 8;
783 		}else{
784 			err = Ebadctl;
785 			break;
786 		}
787 		while(p[m] == '\n')
788 			m++;
789 	}
790 
791 	if(isfbuf)
792 		fbuffree(r);
793 	else
794 		free(r);
795 	if(err)
796 		n = 0;
797 	fc.count = n;
798 	respond(x, &fc, err);
799 	if(settag)
800 		winsettag(w);
801 	if(scrdraw)
802 		textscrdraw(&w->body);
803 }
804 
805 void
806 xfideventwrite(Xfid *x, Window *w)
807 {
808 	Fcall fc;
809 	int m, n;
810 	Rune *r;
811 	char *err, *p, *q;
812 	int isfbuf;
813 	Text *t;
814 	int c;
815 	uint q0, q1;
816 
817 	err = nil;
818 	isfbuf = TRUE;
819 	if(x->fcall.count < RBUFSIZE)
820 		r = fbufalloc();
821 	else{
822 		isfbuf = FALSE;
823 		r = emalloc(x->fcall.count*UTFmax+1);
824 	}
825 	for(n=0; n<x->fcall.count; n+=m){
826 		p = x->fcall.data+n;
827 		w->owner = *p++;	/* disgusting */
828 		c = *p++;
829 		while(*p == ' ')
830 			p++;
831 		q0 = strtoul(p, &q, 10);
832 		if(q == p)
833 			goto Rescue;
834 		p = q;
835 		while(*p == ' ')
836 			p++;
837 		q1 = strtoul(p, &q, 10);
838 		if(q == p)
839 			goto Rescue;
840 		p = q;
841 		while(*p == ' ')
842 			p++;
843 		if(*p++ != '\n')
844 			goto Rescue;
845 		m = p-(x->fcall.data+n);
846 		if('a'<=c && c<='z')
847 			t = &w->tag;
848 		else if('A'<=c && c<='Z')
849 			t = &w->body;
850 		else
851 			goto Rescue;
852 		if(q0>t->file->b.nc || q1>t->file->b.nc || q0>q1)
853 			goto Rescue;
854 
855 		qlock(&row.lk);	/* just like mousethread */
856 		switch(c){
857 		case 'x':
858 		case 'X':
859 			execute(t, q0, q1, TRUE, nil);
860 			break;
861 		case 'l':
862 		case 'L':
863 			look3(t, q0, q1, TRUE);
864 			break;
865 		default:
866 			qunlock(&row.lk);
867 			goto Rescue;
868 		}
869 		qunlock(&row.lk);
870 
871 	}
872 
873     Out:
874 	if(isfbuf)
875 		fbuffree(r);
876 	else
877 		free(r);
878 	if(err)
879 		n = 0;
880 	fc.count = n;
881 	respond(x, &fc, err);
882 	return;
883 
884     Rescue:
885 	err = Ebadevent;
886 	goto Out;
887 }
888 
889 void
890 xfidutfread(Xfid *x, Text *t, uint q1, int qid)
891 {
892 	Fcall fc;
893 	Window *w;
894 	Rune *r;
895 	char *b, *b1;
896 	uint q, off, boff;
897 	int m, n, nr, nb;
898 
899 	w = t->w;
900 	wincommit(w, t);
901 	off = x->fcall.offset;
902 	r = fbufalloc();
903 	b = fbufalloc();
904 	b1 = fbufalloc();
905 	n = 0;
906 	if(qid==w->utflastqid && off>=w->utflastboff && w->utflastq<=q1){
907 		boff = w->utflastboff;
908 		q = w->utflastq;
909 	}else{
910 		/* BUG: stupid code: scan from beginning */
911 		boff = 0;
912 		q = 0;
913 	}
914 	w->utflastqid = qid;
915 	while(q<q1 && n<x->fcall.count){
916 		/*
917 		 * Updating here avoids partial rune problem: we're always on a
918 		 * char boundary. The cost is we will usually do one more read
919 		 * than we really need, but that's better than being n^2.
920 		 */
921 		w->utflastboff = boff;
922 		w->utflastq = q;
923 		nr = q1-q;
924 		if(nr > BUFSIZE/UTFmax)
925 			nr = BUFSIZE/UTFmax;
926 		bufread(&t->file->b, q, r, nr);
927 		nb = snprint(b, BUFSIZE+1, "%.*S", nr, r);
928 		if(boff >= off){
929 			m = nb;
930 			if(boff+m > off+x->fcall.count)
931 				m = off+x->fcall.count - boff;
932 			memmove(b1+n, b, m);
933 			n += m;
934 		}else if(boff+nb > off){
935 			if(n != 0)
936 				error("bad count in utfrune");
937 			m = nb - (off-boff);
938 			if(m > x->fcall.count)
939 				m = x->fcall.count;
940 			memmove(b1, b+(off-boff), m);
941 			n += m;
942 		}
943 		boff += nb;
944 		q += nr;
945 	}
946 	fbuffree(r);
947 	fbuffree(b);
948 	fc.count = n;
949 	fc.data = b1;
950 	respond(x, &fc, nil);
951 	fbuffree(b1);
952 }
953 
954 int
955 xfidruneread(Xfid *x, Text *t, uint q0, uint q1)
956 {
957 	Fcall fc;
958 	Window *w;
959 	Rune *r, junk;
960 	char *b, *b1;
961 	uint q, boff;
962 	int i, rw, m, n, nr, nb;
963 
964 	w = t->w;
965 	wincommit(w, t);
966 	r = fbufalloc();
967 	b = fbufalloc();
968 	b1 = fbufalloc();
969 	n = 0;
970 	q = q0;
971 	boff = 0;
972 	while(q<q1 && n<x->fcall.count){
973 		nr = q1-q;
974 		if(nr > BUFSIZE/UTFmax)
975 			nr = BUFSIZE/UTFmax;
976 		bufread(&t->file->b, q, r, nr);
977 		nb = snprint(b, BUFSIZE+1, "%.*S", nr, r);
978 		m = nb;
979 		if(boff+m > x->fcall.count){
980 			i = x->fcall.count - boff;
981 			/* copy whole runes only */
982 			m = 0;
983 			nr = 0;
984 			while(m < i){
985 				rw = chartorune(&junk, b+m);
986 				if(m+rw > i)
987 					break;
988 				m += rw;
989 				nr++;
990 			}
991 			if(m == 0)
992 				break;
993 		}
994 		memmove(b1+n, b, m);
995 		n += m;
996 		boff += nb;
997 		q += nr;
998 	}
999 	fbuffree(r);
1000 	fbuffree(b);
1001 	fc.count = n;
1002 	fc.data = b1;
1003 	respond(x, &fc, nil);
1004 	fbuffree(b1);
1005 	return q-q0;
1006 }
1007 
1008 void
1009 xfideventread(Xfid *x, Window *w)
1010 {
1011 	Fcall fc;
1012 	int i, n;
1013 
1014 	i = 0;
1015 	x->flushed = FALSE;
1016 	while(w->nevents == 0){
1017 		if(i){
1018 			if(!x->flushed)
1019 				respond(x, &fc, "window shut down");
1020 			return;
1021 		}
1022 		w->eventx = x;
1023 		winunlock(w);
1024 		recvp(x->c);
1025 		winlock(w, 'F');
1026 		i++;
1027 	}
1028 
1029 	n = w->nevents;
1030 	if(n > x->fcall.count)
1031 		n = x->fcall.count;
1032 	fc.count = n;
1033 	fc.data = w->events;
1034 	respond(x, &fc, nil);
1035 	w->nevents -= n;
1036 	if(w->nevents){
1037 		memmove(w->events, w->events+n, w->nevents);
1038 		w->events = erealloc(w->events, w->nevents);
1039 	}else{
1040 		free(w->events);
1041 		w->events = nil;
1042 	}
1043 }
1044 
1045 void
1046 xfidindexread(Xfid *x)
1047 {
1048 	Fcall fc;
1049 	int i, j, m, n, nmax, isbuf, cnt, off;
1050 	Window *w;
1051 	char *b;
1052 	Rune *r;
1053 	Column *c;
1054 
1055 	qlock(&row.lk);
1056 	nmax = 0;
1057 	for(j=0; j<row.ncol; j++){
1058 		c = row.col[j];
1059 		for(i=0; i<c->nw; i++){
1060 			w = c->w[i];
1061 			nmax += Ctlsize + w->tag.file->b.nc*UTFmax + 1;
1062 		}
1063 	}
1064 	nmax++;
1065 	isbuf = (nmax<=RBUFSIZE);
1066 	if(isbuf)
1067 		b = (char*)x->buf;
1068 	else
1069 		b = emalloc(nmax);
1070 	r = fbufalloc();
1071 	n = 0;
1072 	for(j=0; j<row.ncol; j++){
1073 		c = row.col[j];
1074 		for(i=0; i<c->nw; i++){
1075 			w = c->w[i];
1076 			/* only show the currently active window of a set */
1077 			if(w->body.file->curtext != &w->body)
1078 				continue;
1079 			winctlprint(w, b+n, 0);
1080 			n += Ctlsize;
1081 			m = min(RBUFSIZE, w->tag.file->b.nc);
1082 			bufread(&w->tag.file->b, 0, r, m);
1083 			m = n + snprint(b+n, nmax-n-1, "%.*S", m, r);
1084 			while(n<m && b[n]!='\n')
1085 				n++;
1086 			b[n++] = '\n';
1087 		}
1088 	}
1089 	qunlock(&row.lk);
1090 	off = x->fcall.offset;
1091 	cnt = x->fcall.count;
1092 	if(off > n)
1093 		off = n;
1094 	if(off+cnt > n)
1095 		cnt = n-off;
1096 	fc.count = cnt;
1097 	memmove(r, b+off, cnt);
1098 	fc.data = (char*)r;
1099 	if(!isbuf)
1100 		free(b);
1101 	respond(x, &fc, nil);
1102 	fbuffree(r);
1103 }