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Date:: Fri May 5 04:55:14 2006 UTC
Message:: fix edit pipe bug
Actions:: History | Blame | Raw File
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 void
399 xfidwrite(Xfid *x)
400 {
401 	Fcall fc;
402 	int c, cnt, qid, q, nb, nr, eval;
403 	char buf[64], *err;
404 	Window *w;
405 	Rune *r;
406 	Range a;
407 	Text *t;
408 	uint q0, tq0, tq1;
409 
410 	qid = FILE(x->f->qid);
411 	w = x->f->w;
412 	if(w){
413 		c = 'F';
414 		if(qid==QWtag || qid==QWbody)
415 			c = 'E';
416 		winlock(w, c);
417 		if(w->col == nil){
418 			winunlock(w);
419 			respond(x, &fc, Edel);
420 			return;
421 		}
422 	}
423 	x->fcall.data[x->fcall.count] = 0;
424 	switch(qid){
425 	case Qcons:
426 		w = errorwin(x->f->mntdir, 'X');
427 		t=&w->body;
428 		goto BodyTag;
429 
430 	case Qlabel:
431 		fc.count = x->fcall.count;
432 		respond(x, &fc, nil);
433 		break;
434 
435 	case QWaddr:
436 		x->fcall.data[x->fcall.count] = 0;
437 		r = bytetorune(x->fcall.data, &nr);
438 		t = &w->body;
439 		wincommit(w, t);
440 		eval = TRUE;
441 		a = address(FALSE, t, w->limit, w->addr, r, 0, nr, rgetc, &eval, (uint*)&nb);
442 		free(r);
443 		if(nb < nr){
444 			respond(x, &fc, Ebadaddr);
445 			break;
446 		}
447 		if(!eval){
448 			respond(x, &fc, Eaddr);
449 			break;
450 		}
451 		w->addr = a;
452 		fc.count = x->fcall.count;
453 		respond(x, &fc, nil);
454 		break;
455 
456 	case Qeditout:
457 	case QWeditout:
458 		r = bytetorune(x->fcall.data, &nr);
459 		if(w)
460 			err = edittext(w, w->wrselrange.q1, r, nr);
461 		else
462 			err = edittext(nil, 0, r, nr);
463 		free(r);
464 		if(err != nil){
465 			respond(x, &fc, err);
466 			break;
467 		}
468 		fc.count = x->fcall.count;
469 		respond(x, &fc, nil);
470 		break;
471 
472 	case QWerrors:
473 		w = errorwinforwin(w);
474 		t = &w->body;
475 		goto BodyTag;
476 
477 	case QWbody:
478 	case QWwrsel:
479 		t = &w->body;
480 		goto BodyTag;
481 
482 	case QWctl:
483 		xfidctlwrite(x, w);
484 		break;
485 
486 	case QWdata:
487 		a = w->addr;
488 		t = &w->body;
489 		wincommit(w, t);
490 		if(a.q0>t->file->b.nc || a.q1>t->file->b.nc){
491 			respond(x, &fc, Eaddr);
492 			break;
493 		}
494 		r = runemalloc(x->fcall.count);
495 		cvttorunes(x->fcall.data, x->fcall.count, r, &nb, &nr, nil);
496 		if(w->nomark == FALSE){
497 			seq++;
498 			filemark(t->file);
499 		}
500 		q0 = a.q0;
501 		if(a.q1 > q0){
502 			textdelete(t, q0, a.q1, TRUE);
503 			w->addr.q1 = q0;
504 		}
505 		tq0 = t->q0;
506 		tq1 = t->q1;
507 		textinsert(t, q0, r, nr, TRUE);
508 		if(tq0 >= q0)
509 			tq0 += nr;
510 		if(tq1 >= q0)
511 			tq1 += nr;
512 		textsetselect(t, tq0, tq1);
513 		if(!t->w->noscroll)
514 			textshow(t, q0, q0+nr, 0);
515 		textscrdraw(t);
516 		winsettag(w);
517 		free(r);
518 		w->addr.q0 += nr;
519 		w->addr.q1 = w->addr.q0;
520 		fc.count = x->fcall.count;
521 		respond(x, &fc, nil);
522 		break;
523 
524 	case QWevent:
525 		xfideventwrite(x, w);
526 		break;
527 
528 	case QWtag:
529 		t = &w->tag;
530 		goto BodyTag;
531 
532 	BodyTag:
533 		q = x->f->nrpart;
534 		cnt = x->fcall.count;
535 		if(q > 0){
536 			memmove(x->fcall.data+q, x->fcall.data, cnt);	/* there's room; see fsysproc */
537 			memmove(x->fcall.data, x->f->rpart, q);
538 			cnt += q;
539 			x->f->nrpart = 0;
540 		}
541 		r = runemalloc(cnt);
542 		cvttorunes(x->fcall.data, cnt-UTFmax, r, &nb, &nr, nil);
543 		/* approach end of buffer */
544 		while(fullrune(x->fcall.data+nb, cnt-nb)){
545 			c = nb;
546 			nb += chartorune(&r[nr], x->fcall.data+c);
547 			if(r[nr])
548 				nr++;
549 		}
550 		if(nb < cnt){
551 			memmove(x->f->rpart, x->fcall.data+nb, cnt-nb);
552 			x->f->nrpart = cnt-nb;
553 		}
554 		if(nr > 0){
555 			wincommit(w, t);
556 			if(qid == QWwrsel){
557 				q0 = w->wrselrange.q1;
558 				if(q0 > t->file->b.nc)
559 					q0 = t->file->b.nc;
560 			}else
561 				q0 = t->file->b.nc;
562 			if(qid == QWtag)
563 				textinsert(t, q0, r, nr, TRUE);
564 			else{
565 				if(w->nomark == FALSE){
566 					seq++;
567 					filemark(t->file);
568 				}
569 				q0 = textbsinsert(t, q0, r, nr, TRUE, &nr);
570 				textsetselect(t, t->q0, t->q1);	/* insert could leave it somewhere else */
571 				if(qid!=QWwrsel && !t->w->noscroll)
572 					textshow(t, q0+nr, q0+nr, 1);
573 				textscrdraw(t);
574 			}
575 			winsettag(w);
576 			if(qid == QWwrsel)
577 				w->wrselrange.q1 += nr;
578 			free(r);
579 		}
580 		fc.count = x->fcall.count;
581 		respond(x, &fc, nil);
582 		break;
583 
584 	default:
585 		sprint(buf, "unknown qid %d in write", qid);
586 		respond(x, &fc, buf);
587 		break;
588 	}
589 	if(w)
590 		winunlock(w);
591 }
592 
593 void
594 xfidctlwrite(Xfid *x, Window *w)
595 {
596 	Fcall fc;
597 	int i, m, n, nb, nr, nulls;
598 	Rune *r;
599 	char *err, *p, *pp, *q, *e;
600 	int isfbuf, scrdraw, settag;
601 	Text *t;
602 
603 	err = nil;
604 	e = x->fcall.data+x->fcall.count;
605 	scrdraw = FALSE;
606 	settag = FALSE;
607 	isfbuf = TRUE;
608 	if(x->fcall.count < RBUFSIZE)
609 		r = fbufalloc();
610 	else{
611 		isfbuf = FALSE;
612 		r = emalloc(x->fcall.count*UTFmax+1);
613 	}
614 	x->fcall.data[x->fcall.count] = 0;
615 	textcommit(&w->tag, TRUE);
616 	for(n=0; n<x->fcall.count; n+=m){
617 		p = x->fcall.data+n;
618 		if(strncmp(p, "lock", 4) == 0){	/* make window exclusive use */
619 			qlock(&w->ctllock);
620 			w->ctlfid = x->f->fid;
621 			m = 4;
622 		}else
623 		if(strncmp(p, "unlock", 6) == 0){	/* release exclusive use */
624 			w->ctlfid = ~0;
625 			qunlock(&w->ctllock);
626 			m = 6;
627 		}else
628 		if(strncmp(p, "clean", 5) == 0){	/* mark window 'clean', seq=0 */
629 			t = &w->body;
630 			t->eq0 = ~0;
631 			filereset(t->file);
632 			t->file->mod = FALSE;
633 			w->dirty = FALSE;
634 			settag = TRUE;
635 			m = 5;
636 		}else
637 		if(strncmp(p, "dirty", 5) == 0){	/* mark window 'dirty' */
638 			t = &w->body;
639 			/* doesn't change sequence number, so "Put" won't appear.  it shouldn't. */
640 			t->file->mod = TRUE;
641 			w->dirty = TRUE;
642 			settag = TRUE;
643 			m = 5;
644 		}else
645 		if(strncmp(p, "show", 4) == 0){	/* show dot */
646 			t = &w->body;
647 			textshow(t, t->q0, t->q1, 1);
648 			m = 4;
649 		}else
650 		if(strncmp(p, "name ", 5) == 0){	/* set file name */
651 			pp = p+5;
652 			m = 5;
653 			q = memchr(pp, '\n', e-pp);
654 			if(q==nil || q==pp){
655 				err = Ebadctl;
656 				break;
657 			}
658 			*q = 0;
659 			nulls = FALSE;
660 			cvttorunes(pp, q-pp, r, &nb, &nr, &nulls);
661 			if(nulls){
662 				err = "nulls in file name";
663 				break;
664 			}
665 			for(i=0; i<nr; i++)
666 				if(r[i] <= ' '){
667 					err = "bad character in file name";
668 					goto out;
669 				}
670 out:
671 			seq++;
672 			filemark(w->body.file);
673 			winsetname(w, r, nr);
674 			m += (q+1) - pp;
675 		}else
676 		if(strncmp(p, "dump ", 5) == 0){	/* set dump string */
677 			pp = p+5;
678 			m = 5;
679 			q = memchr(pp, '\n', e-pp);
680 			if(q==nil || q==pp){
681 				err = Ebadctl;
682 				break;
683 			}
684 			*q = 0;
685 			nulls = FALSE;
686 			cvttorunes(pp, q-pp, r, &nb, &nr, &nulls);
687 			if(nulls){
688 				err = "nulls in dump string";
689 				break;
690 			}
691 			w->dumpstr = runetobyte(r, nr);
692 			m += (q+1) - pp;
693 		}else
694 		if(strncmp(p, "dumpdir ", 8) == 0){	/* set dump directory */
695 			pp = p+8;
696 			m = 8;
697 			q = memchr(pp, '\n', e-pp);
698 			if(q==nil || q==pp){
699 				err = Ebadctl;
700 				break;
701 			}
702 			*q = 0;
703 			nulls = FALSE;
704 			cvttorunes(pp, q-pp, r, &nb, &nr, &nulls);
705 			if(nulls){
706 				err = "nulls in dump directory string";
707 				break;
708 			}
709 			w->dumpdir = runetobyte(r, nr);
710 			m += (q+1) - pp;
711 		}else
712 		if(strncmp(p, "delete", 6) == 0){	/* delete for sure */
713 			colclose(w->col, w, TRUE);
714 			m = 6;
715 		}else
716 		if(strncmp(p, "del", 3) == 0){	/* delete, but check dirty */
717 			if(!winclean(w, TRUE)){
718 				err = "file dirty";
719 				break;
720 			}
721 			colclose(w->col, w, TRUE);
722 			m = 3;
723 		}else
724 		if(strncmp(p, "get", 3) == 0){	/* get file */
725 			get(&w->body, nil, nil, FALSE, XXX, nil, 0);
726 			m = 3;
727 		}else
728 		if(strncmp(p, "put", 3) == 0){	/* put file */
729 			put(&w->body, nil, nil, XXX, XXX, nil, 0);
730 			m = 3;
731 		}else
732 		if(strncmp(p, "dot=addr", 8) == 0){	/* set dot */
733 			textcommit(&w->body, TRUE);
734 			clampaddr(w);
735 			w->body.q0 = w->addr.q0;
736 			w->body.q1 = w->addr.q1;
737 			textsetselect(&w->body, w->body.q0, w->body.q1);
738 			settag = TRUE;
739 			m = 8;
740 		}else
741 		if(strncmp(p, "addr=dot", 8) == 0){	/* set addr */
742 			w->addr.q0 = w->body.q0;
743 			w->addr.q1 = w->body.q1;
744 			m = 8;
745 		}else
746 		if(strncmp(p, "limit=addr", 10) == 0){	/* set limit */
747 			textcommit(&w->body, TRUE);
748 			clampaddr(w);
749 			w->limit.q0 = w->addr.q0;
750 			w->limit.q1 = w->addr.q1;
751 			m = 10;
752 		}else
753 		if(strncmp(p, "nomark", 6) == 0){	/* turn off automatic marking */
754 			w->nomark = TRUE;
755 			m = 6;
756 		}else
757 		if(strncmp(p, "mark", 4) == 0){	/* mark file */
758 			seq++;
759 			filemark(w->body.file);
760 			settag = TRUE;
761 			m = 4;
762 		}else
763 		if(strncmp(p, "noscroll", 8) == 0){	/* turn off automatic scrolling */
764 			w->noscroll = TRUE;
765 			m = 8;
766 		}else
767 		if(strncmp(p, "cleartag", 8) == 0){	/* wipe tag right of bar */
768 			wincleartag(w);
769 			settag = TRUE;
770 			m = 8;
771 		}else
772 		if(strncmp(p, "scroll", 6) == 0){	/* turn on automatic scrolling (writes to body only) */
773 			w->noscroll = FALSE;
774 			m = 6;
775 		}else{
776 			err = Ebadctl;
777 			break;
778 		}
779 		while(p[m] == '\n')
780 			m++;
781 	}
782 
783 	if(isfbuf)
784 		fbuffree(r);
785 	else
786 		free(r);
787 	if(err)
788 		n = 0;
789 	fc.count = n;
790 	respond(x, &fc, err);
791 	if(settag)
792 		winsettag(w);
793 	if(scrdraw)
794 		textscrdraw(&w->body);
795 }
796 
797 void
798 xfideventwrite(Xfid *x, Window *w)
799 {
800 	Fcall fc;
801 	int m, n;
802 	Rune *r;
803 	char *err, *p, *q;
804 	int isfbuf;
805 	Text *t;
806 	int c;
807 	uint q0, q1;
808 
809 	err = nil;
810 	isfbuf = TRUE;
811 	if(x->fcall.count < RBUFSIZE)
812 		r = fbufalloc();
813 	else{
814 		isfbuf = FALSE;
815 		r = emalloc(x->fcall.count*UTFmax+1);
816 	}
817 	for(n=0; n<x->fcall.count; n+=m){
818 		p = x->fcall.data+n;
819 		w->owner = *p++;	/* disgusting */
820 		c = *p++;
821 		while(*p == ' ')
822 			p++;
823 		q0 = strtoul(p, &q, 10);
824 		if(q == p)
825 			goto Rescue;
826 		p = q;
827 		while(*p == ' ')
828 			p++;
829 		q1 = strtoul(p, &q, 10);
830 		if(q == p)
831 			goto Rescue;
832 		p = q;
833 		while(*p == ' ')
834 			p++;
835 		if(*p++ != '\n')
836 			goto Rescue;
837 		m = p-(x->fcall.data+n);
838 		if('a'<=c && c<='z')
839 			t = &w->tag;
840 		else if('A'<=c && c<='Z')
841 			t = &w->body;
842 		else
843 			goto Rescue;
844 		if(q0>t->file->b.nc || q1>t->file->b.nc || q0>q1)
845 			goto Rescue;
846 
847 		qlock(&row.lk);	/* just like mousethread */
848 		switch(c){
849 		case 'x':
850 		case 'X':
851 			execute(t, q0, q1, TRUE, nil);
852 			break;
853 		case 'l':
854 		case 'L':
855 			look3(t, q0, q1, TRUE);
856 			break;
857 		default:
858 			qunlock(&row.lk);
859 			goto Rescue;
860 		}
861 		qunlock(&row.lk);
862 
863 	}
864 
865     Out:
866 	if(isfbuf)
867 		fbuffree(r);
868 	else
869 		free(r);
870 	if(err)
871 		n = 0;
872 	fc.count = n;
873 	respond(x, &fc, err);
874 	return;
875 
876     Rescue:
877 	err = Ebadevent;
878 	goto Out;
879 }
880 
881 void
882 xfidutfread(Xfid *x, Text *t, uint q1, int qid)
883 {
884 	Fcall fc;
885 	Window *w;
886 	Rune *r;
887 	char *b, *b1;
888 	uint q, off, boff;
889 	int m, n, nr, nb;
890 
891 	w = t->w;
892 	wincommit(w, t);
893 	off = x->fcall.offset;
894 	r = fbufalloc();
895 	b = fbufalloc();
896 	b1 = fbufalloc();
897 	n = 0;
898 	if(qid==w->utflastqid && off>=w->utflastboff && w->utflastq<=q1){
899 		boff = w->utflastboff;
900 		q = w->utflastq;
901 	}else{
902 		/* BUG: stupid code: scan from beginning */
903 		boff = 0;
904 		q = 0;
905 	}
906 	w->utflastqid = qid;
907 	while(q<q1 && n<x->fcall.count){
908 		/*
909 		 * Updating here avoids partial rune problem: we're always on a
910 		 * char boundary. The cost is we will usually do one more read
911 		 * than we really need, but that's better than being n^2.
912 		 */
913 		w->utflastboff = boff;
914 		w->utflastq = q;
915 		nr = q1-q;
916 		if(nr > BUFSIZE/UTFmax)
917 			nr = BUFSIZE/UTFmax;
918 		bufread(&t->file->b, q, r, nr);
919 		nb = snprint(b, BUFSIZE+1, "%.*S", nr, r);
920 		if(boff >= off){
921 			m = nb;
922 			if(boff+m > off+x->fcall.count)
923 				m = off+x->fcall.count - boff;
924 			memmove(b1+n, b, m);
925 			n += m;
926 		}else if(boff+nb > off){
927 			if(n != 0)
928 				error("bad count in utfrune");
929 			m = nb - (off-boff);
930 			if(m > x->fcall.count)
931 				m = x->fcall.count;
932 			memmove(b1, b+(off-boff), m);
933 			n += m;
934 		}
935 		boff += nb;
936 		q += nr;
937 	}
938 	fbuffree(r);
939 	fbuffree(b);
940 	fc.count = n;
941 	fc.data = b1;
942 	respond(x, &fc, nil);
943 	fbuffree(b1);
944 }
945 
946 int
947 xfidruneread(Xfid *x, Text *t, uint q0, uint q1)
948 {
949 	Fcall fc;
950 	Window *w;
951 	Rune *r, junk;
952 	char *b, *b1;
953 	uint q, boff;
954 	int i, rw, m, n, nr, nb;
955 
956 	w = t->w;
957 	wincommit(w, t);
958 	r = fbufalloc();
959 	b = fbufalloc();
960 	b1 = fbufalloc();
961 	n = 0;
962 	q = q0;
963 	boff = 0;
964 	while(q<q1 && n<x->fcall.count){
965 		nr = q1-q;
966 		if(nr > BUFSIZE/UTFmax)
967 			nr = BUFSIZE/UTFmax;
968 		bufread(&t->file->b, q, r, nr);
969 		nb = snprint(b, BUFSIZE+1, "%.*S", nr, r);
970 		m = nb;
971 		if(boff+m > x->fcall.count){
972 			i = x->fcall.count - boff;
973 			/* copy whole runes only */
974 			m = 0;
975 			nr = 0;
976 			while(m < i){
977 				rw = chartorune(&junk, b+m);
978 				if(m+rw > i)
979 					break;
980 				m += rw;
981 				nr++;
982 			}
983 			if(m == 0)
984 				break;
985 		}
986 		memmove(b1+n, b, m);
987 		n += m;
988 		boff += nb;
989 		q += nr;
990 	}
991 	fbuffree(r);
992 	fbuffree(b);
993 	fc.count = n;
994 	fc.data = b1;
995 	respond(x, &fc, nil);
996 	fbuffree(b1);
997 	return q-q0;
998 }
999 
1000 void
1001 xfideventread(Xfid *x, Window *w)
1002 {
1003 	Fcall fc;
1004 	int i, n;
1005 
1006 	i = 0;
1007 	x->flushed = FALSE;
1008 	while(w->nevents == 0){
1009 		if(i){
1010 			if(!x->flushed)
1011 				respond(x, &fc, "window shut down");
1012 			return;
1013 		}
1014 		w->eventx = x;
1015 		winunlock(w);
1016 		recvp(x->c);
1017 		winlock(w, 'F');
1018 		i++;
1019 	}
1020 
1021 	n = w->nevents;
1022 	if(n > x->fcall.count)
1023 		n = x->fcall.count;
1024 	fc.count = n;
1025 	fc.data = w->events;
1026 	respond(x, &fc, nil);
1027 	w->nevents -= n;
1028 	if(w->nevents){
1029 		memmove(w->events, w->events+n, w->nevents);
1030 		w->events = erealloc(w->events, w->nevents);
1031 	}else{
1032 		free(w->events);
1033 		w->events = nil;
1034 	}
1035 }
1036 
1037 void
1038 xfidindexread(Xfid *x)
1039 {
1040 	Fcall fc;
1041 	int i, j, m, n, nmax, isbuf, cnt, off;
1042 	Window *w;
1043 	char *b;
1044 	Rune *r;
1045 	Column *c;
1046 
1047 	qlock(&row.lk);
1048 	nmax = 0;
1049 	for(j=0; j<row.ncol; j++){
1050 		c = row.col[j];
1051 		for(i=0; i<c->nw; i++){
1052 			w = c->w[i];
1053 			nmax += Ctlsize + w->tag.file->b.nc*UTFmax + 1;
1054 		}
1055 	}
1056 	nmax++;
1057 	isbuf = (nmax<=RBUFSIZE);
1058 	if(isbuf)
1059 		b = (char*)x->buf;
1060 	else
1061 		b = emalloc(nmax);
1062 	r = fbufalloc();
1063 	n = 0;
1064 	for(j=0; j<row.ncol; j++){
1065 		c = row.col[j];
1066 		for(i=0; i<c->nw; i++){
1067 			w = c->w[i];
1068 			/* only show the currently active window of a set */
1069 			if(w->body.file->curtext != &w->body)
1070 				continue;
1071 			winctlprint(w, b+n, 0);
1072 			n += Ctlsize;
1073 			m = min(RBUFSIZE, w->tag.file->b.nc);
1074 			bufread(&w->tag.file->b, 0, r, m);
1075 			m = n + snprint(b+n, nmax-n-1, "%.*S", m, r);
1076 			while(n<m && b[n]!='\n')
1077 				n++;
1078 			b[n++] = '\n';
1079 		}
1080 	}
1081 	qunlock(&row.lk);
1082 	off = x->fcall.offset;
1083 	cnt = x->fcall.count;
1084 	if(off > n)
1085 		off = n;
1086 	if(off+cnt > n)
1087 		cnt = n-off;
1088 	fc.count = cnt;
1089 	memmove(r, b+off, cnt);
1090 	fc.data = (char*)r;
1091 	if(!isbuf)
1092 		free(b);
1093 	respond(x, &fc, nil);
1094 	fbuffree(r);
1095 }