op public repos

Blob

Date:: Fri Oct 22 17:11:30 2004 UTC
Message:: change md argument to number etc. (which acted only as a flag) to an actual flag. buffer underrun check in number add xdata file for exactly the addressed region save addr across opens
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 	if(w){
102 		winlock(w, 'E');
103 		q = FILE(x->f->qid);
104 		switch(q){
105 		case QWaddr:
106 			w->nopen[q]++;
107 			w->limit = range(-1,-1);
108 			break;
109 		case QWevent:
110 			if(w->nopen[q]++ == 0){
111 				if(!w->isdir && w->col!=nil){
112 					w->filemenu = FALSE;
113 					winsettag(w);
114 				}
115 			}
116 			break;
117 		case QWrdsel:
118 			/*
119 			 * Use a temporary file.
120 			 * A pipe would be the obvious, but we can't afford the
121 			 * broken pipe notification.  Using the code to read QWbody
122 			 * is n², which should probably also be fixed.  Even then,
123 			 * though, we'd need to squirrel away the data in case it's
124 			 * modified during the operation, e.g. by |sort
125 			 */
126 			if(w->rdselfd > 0){
127 				winunlock(w);
128 				respond(x, &fc, Einuse);
129 				return;
130 			}
131 			w->rdselfd = tempfile();
132 			if(w->rdselfd < 0){
133 				winunlock(w);
134 				respond(x, &fc, "can't create temp file");
135 				return;
136 			}
137 			w->nopen[q]++;
138 			q0 = t->q0;
139 			q1 = t->q1;
140 			r = fbufalloc();
141 			s = fbufalloc();
142 			while(q0 < q1){
143 				n = q1 - q0;
144 				if(n > BUFSIZE/UTFmax)
145 					n = BUFSIZE/UTFmax;
146 				bufread(&t->file->b, q0, r, n);
147 				m = snprint(s, BUFSIZE+1, "%.*S", n, r);
148 				if(write(w->rdselfd, s, m) != m){
149 					warning(nil, "can't write temp file for pipe command %r\n");
150 					break;
151 				}
152 				q0 += n;
153 			}
154 			fbuffree(s);
155 			fbuffree(r);
156 			break;
157 		case QWwrsel:
158 			w->nopen[q]++;
159 			seq++;
160 			filemark(t->file);
161 			cut(t, t, nil, FALSE, TRUE, nil, 0);
162 			w->wrselrange = range(t->q1, t->q1);
163 			w->nomark = TRUE;
164 			break;
165 		case QWeditout:
166 			if(editing == FALSE){
167 				winunlock(w);
168 				respond(x, &fc, Eperm);
169 				return;
170 			}
171 			w->wrselrange = range(t->q1, t->q1);
172 			break;
173 		}
174 		winunlock(w);
175 	}
176 	fc.qid = x->f->qid;
177 	fc.iounit = messagesize-IOHDRSZ;
178 	x->f->open = TRUE;
179 	respond(x, &fc, nil);
180 }
181 
182 void
183 xfidclose(Xfid *x)
184 {
185 	Fcall fc;
186 	Window *w;
187 	int q;
188 	Text *t;
189 
190 	w = x->f->w;
191 	x->f->busy = FALSE;
192 	x->f->w = nil;
193 	if(x->f->open == FALSE){
194 		if(w != nil)
195 			winclose(w);
196 		respond(x, &fc, nil);
197 		return;
198 	}
199 
200 	x->f->open = FALSE;
201 	if(w){
202 		winlock(w, 'E');
203 		q = FILE(x->f->qid);
204 		switch(q){
205 		case QWctl:
206 			if(w->ctlfid!=~0 && w->ctlfid==x->f->fid){
207 				w->ctlfid = ~0;
208 				qunlock(&w->ctllock);
209 			}
210 			break;
211 		case QWdata:
212 		case QWxdata:
213 			w->nomark = FALSE;
214 			/* fall through */
215 		case QWaddr:
216 		case QWevent:	/* BUG: do we need to shut down Xfid? */
217 			if(--w->nopen[q] == 0){
218 				if(q == QWdata || q == QWxdata)
219 					w->nomark = FALSE;
220 				if(q==QWevent && !w->isdir && w->col!=nil){
221 					w->filemenu = TRUE;
222 					winsettag(w);
223 				}
224 				if(q == QWevent){
225 					free(w->dumpstr);
226 					free(w->dumpdir);
227 					w->dumpstr = nil;
228 					w->dumpdir = nil;
229 				}
230 			}
231 			break;
232 		case QWrdsel:
233 			close(w->rdselfd);
234 			w->rdselfd = 0;
235 			break;
236 		case QWwrsel:
237 			w->nomark = FALSE;
238 			t = &w->body;
239 			/* before: only did this if !w->noscroll, but that didn't seem right in practice */
240 			textshow(t, min(w->wrselrange.q0, t->file->b.nc),
241 				min(w->wrselrange.q1, t->file->b.nc), 1);
242 			textscrdraw(t);
243 			break;
244 		}
245 		winunlock(w);
246 		winclose(w);
247 	}
248 	respond(x, &fc, nil);
249 }
250 
251 void
252 xfidread(Xfid *x)
253 {
254 	Fcall fc;
255 	int n, q;
256 	uint off;
257 	char *b;
258 	char buf[128];
259 	Window *w;
260 
261 	q = FILE(x->f->qid);
262 	w = x->f->w;
263 	if(w == nil){
264 		fc.count = 0;
265 		switch(q){
266 		case Qcons:
267 		case Qlabel:
268 			break;
269 		case Qindex:
270 			xfidindexread(x);
271 			return;
272 		default:
273 			warning(nil, "unknown qid %d\n", q);
274 			break;
275 		}
276 		respond(x, &fc, nil);
277 		return;
278 	}
279 	winlock(w, 'F');
280 	if(w->col == nil){
281 		winunlock(w);
282 		respond(x, &fc, Edel);
283 		return;
284 	}
285 	off = x->fcall.offset;
286 	switch(q){
287 	case QWaddr:
288 		textcommit(&w->body, TRUE);
289 		clampaddr(w);
290 		sprint(buf, "%11d %11d ", w->addr.q0, w->addr.q1);
291 		goto Readbuf;
292 
293 	case QWbody:
294 		xfidutfread(x, &w->body, w->body.file->b.nc, QWbody);
295 		break;
296 
297 	case QWctl:
298 		winctlprint(w, buf, 1);
299 		goto Readbuf;
300 
301 	Readbuf:
302 		n = strlen(buf);
303 		if(off > n)
304 			off = n;
305 		if(off+x->fcall.count > n)
306 			x->fcall.count = n-off;
307 		fc.count = x->fcall.count;
308 		fc.data = buf+off;
309 		respond(x, &fc, nil);
310 		break;
311 
312 	case QWevent:
313 		xfideventread(x, w);
314 		break;
315 
316 	case QWdata:
317 		/* BUG: what should happen if q1 > q0? */
318 		if(w->addr.q0 > w->body.file->b.nc){
319 			respond(x, &fc, Eaddr);
320 			break;
321 		}
322 		w->addr.q0 += xfidruneread(x, &w->body, w->addr.q0, w->body.file->b.nc);
323 		w->addr.q1 = w->addr.q0;
324 		break;
325 
326 	case QWxdata:
327 		/* BUG: what should happen if q1 > q0? */
328 		if(w->addr.q0 > w->body.file->b.nc){
329 			respond(x, &fc, Eaddr);
330 			break;
331 		}
332 		w->addr.q0 += xfidruneread(x, &w->body, w->addr.q0, w->addr.q1);
333 		break;
334 
335 	case QWtag:
336 		xfidutfread(x, &w->tag, w->tag.file->b.nc, QWtag);
337 		break;
338 
339 	case QWrdsel:
340 		seek(w->rdselfd, off, 0);
341 		n = x->fcall.count;
342 		if(n > BUFSIZE)
343 			n = BUFSIZE;
344 		b = fbufalloc();
345 		n = read(w->rdselfd, b, n);
346 		if(n < 0){
347 			respond(x, &fc, "I/O error in temp file");
348 			break;
349 		}
350 		fc.count = n;
351 		fc.data = b;
352 		respond(x, &fc, nil);
353 		fbuffree(b);
354 		break;
355 
356 	default:
357 		sprint(buf, "unknown qid %d in read", q);
358 		respond(x, &fc, nil);
359 	}
360 	winunlock(w);
361 }
362 
363 void
364 xfidwrite(Xfid *x)
365 {
366 	Fcall fc;
367 	int c, cnt, qid, q, nb, nr, eval;
368 	char buf[64], *err;
369 	Window *w;
370 	Rune *r;
371 	Range a;
372 	Text *t;
373 	uint q0, tq0, tq1;
374 
375 	qid = FILE(x->f->qid);
376 	w = x->f->w;
377 	if(w){
378 		c = 'F';
379 		if(qid==QWtag || qid==QWbody)
380 			c = 'E';
381 		winlock(w, c);
382 		if(w->col == nil){
383 			winunlock(w);
384 			respond(x, &fc, Edel);
385 			return;
386 		}
387 	}
388 	x->fcall.data[x->fcall.count] = 0;
389 	switch(qid){
390 	case Qcons:
391 		w = errorwin(x->f->mntdir, 'X');
392 		t=&w->body;
393 		goto BodyTag;
394 
395 	case Qlabel:
396 		fc.count = x->fcall.count;
397 		respond(x, &fc, nil);
398 		break;
399 
400 	case QWaddr:
401 		x->fcall.data[x->fcall.count] = 0;
402 		r = bytetorune(x->fcall.data, &nr);
403 		t = &w->body;
404 		wincommit(w, t);
405 		eval = TRUE;
406 		a = address(FALSE, t, w->limit, w->addr, r, 0, nr, rgetc, &eval, (uint*)&nb);
407 		free(r);
408 		if(nb < nr){
409 			respond(x, &fc, Ebadaddr);
410 			break;
411 		}
412 		if(!eval){
413 			respond(x, &fc, Eaddr);
414 			break;
415 		}
416 		w->addr = a;
417 		fc.count = x->fcall.count;
418 		respond(x, &fc, nil);
419 		break;
420 
421 	case Qeditout:
422 	case QWeditout:
423 		r = bytetorune(x->fcall.data, &nr);
424 		if(w)
425 			err = edittext(w, w->wrselrange.q1, r, nr);
426 		else
427 			err = edittext(nil, 0, r, nr);
428 		free(r);
429 		if(err != nil){
430 			respond(x, &fc, err);
431 			break;
432 		}
433 		fc.count = x->fcall.count;
434 		respond(x, &fc, nil);
435 		break;
436 
437 	case QWbody:
438 	case QWwrsel:
439 		t = &w->body;
440 		goto BodyTag;
441 
442 	case QWctl:
443 		xfidctlwrite(x, w);
444 		break;
445 
446 	case QWdata:
447 		a = w->addr;
448 		t = &w->body;
449 		wincommit(w, t);
450 		if(a.q0>t->file->b.nc || a.q1>t->file->b.nc){
451 			respond(x, &fc, Eaddr);
452 			break;
453 		}
454 		r = runemalloc(x->fcall.count);
455 		cvttorunes(x->fcall.data, x->fcall.count, r, &nb, &nr, nil);
456 		if(w->nomark == FALSE){
457 			seq++;
458 			filemark(t->file);
459 		}
460 		q0 = a.q0;
461 		if(a.q1 > q0){
462 			textdelete(t, q0, a.q1, TRUE);
463 			w->addr.q1 = q0;
464 		}
465 		tq0 = t->q0;
466 		tq1 = t->q1;
467 		textinsert(t, q0, r, nr, TRUE);
468 		if(tq0 >= q0)
469 			tq0 += nr;
470 		if(tq1 >= q0)
471 			tq1 += nr;
472 		textsetselect(t, tq0, tq1);
473 		if(!t->w->noscroll)
474 			textshow(t, q0, q0+nr, 0);
475 		textscrdraw(t);
476 		winsettag(w);
477 		free(r);
478 		w->addr.q0 += nr;
479 		w->addr.q1 = w->addr.q0;
480 		fc.count = x->fcall.count;
481 		respond(x, &fc, nil);
482 		break;
483 
484 	case QWevent:
485 		xfideventwrite(x, w);
486 		break;
487 
488 	case QWtag:
489 		t = &w->tag;
490 		goto BodyTag;
491 
492 	BodyTag:
493 		q = x->f->nrpart;
494 		cnt = x->fcall.count;
495 		if(q > 0){
496 			memmove(x->fcall.data+q, x->fcall.data, cnt);	/* there's room; see fsysproc */
497 			memmove(x->fcall.data, x->f->rpart, q);
498 			cnt += q;
499 			x->f->nrpart = 0;
500 		}
501 		r = runemalloc(cnt);
502 		cvttorunes(x->fcall.data, cnt-UTFmax, r, &nb, &nr, nil);
503 		/* approach end of buffer */
504 		while(fullrune(x->fcall.data+nb, cnt-nb)){
505 			c = nb;
506 			nb += chartorune(&r[nr], x->fcall.data+c);
507 			if(r[nr])
508 				nr++;
509 		}
510 		if(nb < cnt){
511 			memmove(x->f->rpart, x->fcall.data+nb, cnt-nb);
512 			x->f->nrpart = cnt-nb;
513 		}
514 		if(nr > 0){
515 			wincommit(w, t);
516 			if(qid == QWwrsel){
517 				q0 = w->wrselrange.q1;
518 				if(q0 > t->file->b.nc)
519 					q0 = t->file->b.nc;
520 			}else
521 				q0 = t->file->b.nc;
522 			if(qid == QWtag)
523 				textinsert(t, q0, r, nr, TRUE);
524 			else{
525 				if(w->nomark == FALSE){
526 					seq++;
527 					filemark(t->file);
528 				}
529 				q0 = textbsinsert(t, q0, r, nr, TRUE, &nr);
530 				textsetselect(t, t->q0, t->q1);	/* insert could leave it somewhere else */
531 				if(qid!=QWwrsel && !t->w->noscroll)
532 					textshow(t, q0+nr, q0+nr, 1);
533 				textscrdraw(t);
534 			}
535 			winsettag(w);
536 			if(qid == QWwrsel)
537 				w->wrselrange.q1 += nr;
538 			free(r);
539 		}
540 		fc.count = x->fcall.count;
541 		respond(x, &fc, nil);
542 		break;
543 
544 	default:
545 		sprint(buf, "unknown qid %d in write", qid);
546 		respond(x, &fc, buf);
547 		break;
548 	}
549 	if(w)
550 		winunlock(w);
551 }
552 
553 void
554 xfidctlwrite(Xfid *x, Window *w)
555 {
556 	Fcall fc;
557 	int i, m, n, nb, nr, nulls;
558 	Rune *r;
559 	char *err, *p, *pp, *q, *e;
560 	int isfbuf, scrdraw, settag;
561 	Text *t;
562 
563 	err = nil;
564 	e = x->fcall.data+x->fcall.count;
565 	scrdraw = FALSE;
566 	settag = FALSE;
567 	isfbuf = TRUE;
568 	if(x->fcall.count < RBUFSIZE)
569 		r = fbufalloc();
570 	else{
571 		isfbuf = FALSE;
572 		r = emalloc(x->fcall.count*UTFmax+1);
573 	}
574 	x->fcall.data[x->fcall.count] = 0;
575 	textcommit(&w->tag, TRUE);
576 	for(n=0; n<x->fcall.count; n+=m){
577 		p = x->fcall.data+n;
578 		if(strncmp(p, "lock", 4) == 0){	/* make window exclusive use */
579 			qlock(&w->ctllock);
580 			w->ctlfid = x->f->fid;
581 			m = 4;
582 		}else
583 		if(strncmp(p, "unlock", 6) == 0){	/* release exclusive use */
584 			w->ctlfid = ~0;
585 			qunlock(&w->ctllock);
586 			m = 6;
587 		}else
588 		if(strncmp(p, "clean", 5) == 0){	/* mark window 'clean', seq=0 */
589 			t = &w->body;
590 			t->eq0 = ~0;
591 			filereset(t->file);
592 			t->file->mod = FALSE;
593 			w->dirty = FALSE;
594 			settag = TRUE;
595 			m = 5;
596 		}else
597 		if(strncmp(p, "dirty", 5) == 0){	/* mark window 'dirty' */
598 			t = &w->body;
599 			/* doesn't change sequence number, so "Put" won't appear.  it shouldn't. */
600 			t->file->mod = TRUE;
601 			w->dirty = TRUE;
602 			settag = TRUE;
603 			m = 5;
604 		}else
605 		if(strncmp(p, "show", 4) == 0){	/* show dot */
606 			t = &w->body;
607 			textshow(t, t->q0, t->q1, 1);
608 			m = 4;
609 		}else
610 		if(strncmp(p, "name ", 5) == 0){	/* set file name */
611 			pp = p+5;
612 			m = 5;
613 			q = memchr(pp, '\n', e-pp);
614 			if(q==nil || q==pp){
615 				err = Ebadctl;
616 				break;
617 			}
618 			*q = 0;
619 			nulls = FALSE;
620 			cvttorunes(pp, q-pp, r, &nb, &nr, &nulls);
621 			if(nulls){
622 				err = "nulls in file name";
623 				break;
624 			}
625 			for(i=0; i<nr; i++)
626 				if(r[i] <= ' '){
627 					err = "bad character in file name";
628 					goto out;
629 				}
630 out:
631 			seq++;
632 			filemark(w->body.file);
633 			winsetname(w, r, nr);
634 			m += (q+1) - pp;
635 		}else
636 		if(strncmp(p, "dump ", 5) == 0){	/* set dump string */
637 			pp = p+5;
638 			m = 5;
639 			q = memchr(pp, '\n', e-pp);
640 			if(q==nil || q==pp){
641 				err = Ebadctl;
642 				break;
643 			}
644 			*q = 0;
645 			nulls = FALSE;
646 			cvttorunes(pp, q-pp, r, &nb, &nr, &nulls);
647 			if(nulls){
648 				err = "nulls in dump string";
649 				break;
650 			}
651 			w->dumpstr = runetobyte(r, nr);
652 			m += (q+1) - pp;
653 		}else
654 		if(strncmp(p, "dumpdir ", 8) == 0){	/* set dump directory */
655 			pp = p+8;
656 			m = 8;
657 			q = memchr(pp, '\n', e-pp);
658 			if(q==nil || q==pp){
659 				err = Ebadctl;
660 				break;
661 			}
662 			*q = 0;
663 			nulls = FALSE;
664 			cvttorunes(pp, q-pp, r, &nb, &nr, &nulls);
665 			if(nulls){
666 				err = "nulls in dump directory string";
667 				break;
668 			}
669 			w->dumpdir = runetobyte(r, nr);
670 			m += (q+1) - pp;
671 		}else
672 		if(strncmp(p, "delete", 6) == 0){	/* delete for sure */
673 			colclose(w->col, w, TRUE);
674 			m = 6;
675 		}else
676 		if(strncmp(p, "del", 3) == 0){	/* delete, but check dirty */
677 			if(!winclean(w, TRUE)){
678 				err = "file dirty";
679 				break;
680 			}
681 			colclose(w->col, w, TRUE);
682 			m = 3;
683 		}else
684 		if(strncmp(p, "get", 3) == 0){	/* get file */
685 			get(&w->body, nil, nil, FALSE, XXX, nil, 0);
686 			m = 3;
687 		}else
688 		if(strncmp(p, "put", 3) == 0){	/* put file */
689 			put(&w->body, nil, nil, XXX, XXX, nil, 0);
690 			m = 3;
691 		}else
692 		if(strncmp(p, "dot=addr", 8) == 0){	/* set dot */
693 			textcommit(&w->body, TRUE);
694 			clampaddr(w);
695 			w->body.q0 = w->addr.q0;
696 			w->body.q1 = w->addr.q1;
697 			textsetselect(&w->body, w->body.q0, w->body.q1);
698 			settag = TRUE;
699 			m = 8;
700 		}else
701 		if(strncmp(p, "addr=dot", 8) == 0){	/* set addr */
702 			w->addr.q0 = w->body.q0;
703 			w->addr.q1 = w->body.q1;
704 			m = 8;
705 		}else
706 		if(strncmp(p, "limit=addr", 10) == 0){	/* set limit */
707 			textcommit(&w->body, TRUE);
708 			clampaddr(w);
709 			w->limit.q0 = w->addr.q0;
710 			w->limit.q1 = w->addr.q1;
711 			m = 10;
712 		}else
713 		if(strncmp(p, "nomark", 6) == 0){	/* turn off automatic marking */
714 			w->nomark = TRUE;
715 			m = 6;
716 		}else
717 		if(strncmp(p, "mark", 4) == 0){	/* mark file */
718 			seq++;
719 			filemark(w->body.file);
720 			settag = TRUE;
721 			m = 4;
722 		}else
723 		if(strncmp(p, "noscroll", 8) == 0){	/* turn off automatic scrolling */
724 			w->noscroll = TRUE;
725 			m = 8;
726 		}else
727 		if(strncmp(p, "cleartag", 8) == 0){	/* wipe tag right of bar */
728 			wincleartag(w);
729 			settag = TRUE;
730 			m = 8;
731 		}else
732 		if(strncmp(p, "scroll", 6) == 0){	/* turn on automatic scrolling (writes to body only) */
733 			w->noscroll = FALSE;
734 			m = 6;
735 		}else{
736 			err = Ebadctl;
737 			break;
738 		}
739 		while(p[m] == '\n')
740 			m++;
741 	}
742 
743 	if(isfbuf)
744 		fbuffree(r);
745 	else
746 		free(r);
747 	if(err)
748 		n = 0;
749 	fc.count = n;
750 	respond(x, &fc, err);
751 	if(settag)
752 		winsettag(w);
753 	if(scrdraw)
754 		textscrdraw(&w->body);
755 }
756 
757 void
758 xfideventwrite(Xfid *x, Window *w)
759 {
760 	Fcall fc;
761 	int m, n;
762 	Rune *r;
763 	char *err, *p, *q;
764 	int isfbuf;
765 	Text *t;
766 	int c;
767 	uint q0, q1;
768 
769 	err = nil;
770 	isfbuf = TRUE;
771 	if(x->fcall.count < RBUFSIZE)
772 		r = fbufalloc();
773 	else{
774 		isfbuf = FALSE;
775 		r = emalloc(x->fcall.count*UTFmax+1);
776 	}
777 	for(n=0; n<x->fcall.count; n+=m){
778 		p = x->fcall.data+n;
779 		w->owner = *p++;	/* disgusting */
780 		c = *p++;
781 		while(*p == ' ')
782 			p++;
783 		q0 = strtoul(p, &q, 10);
784 		if(q == p)
785 			goto Rescue;
786 		p = q;
787 		while(*p == ' ')
788 			p++;
789 		q1 = strtoul(p, &q, 10);
790 		if(q == p)
791 			goto Rescue;
792 		p = q;
793 		while(*p == ' ')
794 			p++;
795 		if(*p++ != '\n')
796 			goto Rescue;
797 		m = p-(x->fcall.data+n);
798 		if('a'<=c && c<='z')
799 			t = &w->tag;
800 		else if('A'<=c && c<='Z')
801 			t = &w->body;
802 		else
803 			goto Rescue;
804 		if(q0>t->file->b.nc || q1>t->file->b.nc || q0>q1)
805 			goto Rescue;
806 
807 		qlock(&row.lk);	/* just like mousethread */
808 		switch(c){
809 		case 'x':
810 		case 'X':
811 			execute(t, q0, q1, TRUE, nil);
812 			break;
813 		case 'l':
814 		case 'L':
815 			look3(t, q0, q1, TRUE);
816 			break;
817 		default:
818 			qunlock(&row.lk);
819 			goto Rescue;
820 		}
821 		qunlock(&row.lk);
822 
823 	}
824 
825     Out:
826 	if(isfbuf)
827 		fbuffree(r);
828 	else
829 		free(r);
830 	if(err)
831 		n = 0;
832 	fc.count = n;
833 	respond(x, &fc, err);
834 	return;
835 
836     Rescue:
837 	err = Ebadevent;
838 	goto Out;
839 }
840 
841 void
842 xfidutfread(Xfid *x, Text *t, uint q1, int qid)
843 {
844 	Fcall fc;
845 	Window *w;
846 	Rune *r;
847 	char *b, *b1;
848 	uint q, off, boff;
849 	int m, n, nr, nb;
850 
851 	w = t->w;
852 	wincommit(w, t);
853 	off = x->fcall.offset;
854 	r = fbufalloc();
855 	b = fbufalloc();
856 	b1 = fbufalloc();
857 	n = 0;
858 	if(qid==w->utflastqid && off>=w->utflastboff && w->utflastq<=q1){
859 		boff = w->utflastboff;
860 		q = w->utflastq;
861 	}else{
862 		/* BUG: stupid code: scan from beginning */
863 		boff = 0;
864 		q = 0;
865 	}
866 	w->utflastqid = qid;
867 	while(q<q1 && n<x->fcall.count){
868 		/*
869 		 * Updating here avoids partial rune problem: we're always on a
870 		 * char boundary. The cost is we will usually do one more read
871 		 * than we really need, but that's better than being n^2.
872 		 */
873 		w->utflastboff = boff;
874 		w->utflastq = q;
875 		nr = q1-q;
876 		if(nr > BUFSIZE/UTFmax)
877 			nr = BUFSIZE/UTFmax;
878 		bufread(&t->file->b, q, r, nr);
879 		nb = snprint(b, BUFSIZE+1, "%.*S", nr, r);
880 		if(boff >= off){
881 			m = nb;
882 			if(boff+m > off+x->fcall.count)
883 				m = off+x->fcall.count - boff;
884 			memmove(b1+n, b, m);
885 			n += m;
886 		}else if(boff+nb > off){
887 			if(n != 0)
888 				error("bad count in utfrune");
889 			m = nb - (off-boff);
890 			if(m > x->fcall.count)
891 				m = x->fcall.count;
892 			memmove(b1, b+(off-boff), m);
893 			n += m;
894 		}
895 		boff += nb;
896 		q += nr;
897 	}
898 	fbuffree(r);
899 	fbuffree(b);
900 	fc.count = n;
901 	fc.data = b1;
902 	respond(x, &fc, nil);
903 	fbuffree(b1);
904 }
905 
906 int
907 xfidruneread(Xfid *x, Text *t, uint q0, uint q1)
908 {
909 	Fcall fc;
910 	Window *w;
911 	Rune *r, junk;
912 	char *b, *b1;
913 	uint q, boff;
914 	int i, rw, m, n, nr, nb;
915 
916 	w = t->w;
917 	wincommit(w, t);
918 	r = fbufalloc();
919 	b = fbufalloc();
920 	b1 = fbufalloc();
921 	n = 0;
922 	q = q0;
923 	boff = 0;
924 	while(q<q1 && n<x->fcall.count){
925 		nr = q1-q;
926 		if(nr > BUFSIZE/UTFmax)
927 			nr = BUFSIZE/UTFmax;
928 		bufread(&t->file->b, q, r, nr);
929 		nb = snprint(b, BUFSIZE+1, "%.*S", nr, r);
930 		m = nb;
931 		if(boff+m > x->fcall.count){
932 			i = x->fcall.count - boff;
933 			/* copy whole runes only */
934 			m = 0;
935 			nr = 0;
936 			while(m < i){
937 				rw = chartorune(&junk, b+m);
938 				if(m+rw > i)
939 					break;
940 				m += rw;
941 				nr++;
942 			}
943 			if(m == 0)
944 				break;
945 		}
946 		memmove(b1+n, b, m);
947 		n += m;
948 		boff += nb;
949 		q += nr;
950 	}
951 	fbuffree(r);
952 	fbuffree(b);
953 	fc.count = n;
954 	fc.data = b1;
955 	respond(x, &fc, nil);
956 	fbuffree(b1);
957 	return q-q0;
958 }
959 
960 void
961 xfideventread(Xfid *x, Window *w)
962 {
963 	Fcall fc;
964 	char *b;
965 	int i, n;
966 
967 	i = 0;
968 	x->flushed = FALSE;
969 	while(w->nevents == 0){
970 		if(i){
971 			if(!x->flushed)
972 				respond(x, &fc, "window shut down");
973 			return;
974 		}
975 		w->eventx = x;
976 		winunlock(w);
977 		recvp(x->c);
978 		winlock(w, 'F');
979 		i++;
980 	}
981 
982 	n = w->nevents;
983 	if(n > x->fcall.count)
984 		n = x->fcall.count;
985 	fc.count = n;
986 	fc.data = w->events;
987 	respond(x, &fc, nil);
988 	b = w->events;
989 	w->events = estrdup(w->events+n);
990 	free(b);
991 	w->nevents -= n;
992 }
993 
994 void
995 xfidindexread(Xfid *x)
996 {
997 	Fcall fc;
998 	int i, j, m, n, nmax, isbuf, cnt, off;
999 	Window *w;
1000 	char *b;
1001 	Rune *r;
1002 	Column *c;
1003 
1004 	qlock(&row.lk);
1005 	nmax = 0;
1006 	for(j=0; j<row.ncol; j++){
1007 		c = row.col[j];
1008 		for(i=0; i<c->nw; i++){
1009 			w = c->w[i];
1010 			nmax += Ctlsize + w->tag.file->b.nc*UTFmax + 1;
1011 		}
1012 	}
1013 	nmax++;
1014 	isbuf = (nmax<=RBUFSIZE);
1015 	if(isbuf)
1016 		b = (char*)x->buf;
1017 	else
1018 		b = emalloc(nmax);
1019 	r = fbufalloc();
1020 	n = 0;
1021 	for(j=0; j<row.ncol; j++){
1022 		c = row.col[j];
1023 		for(i=0; i<c->nw; i++){
1024 			w = c->w[i];
1025 			/* only show the currently active window of a set */
1026 			if(w->body.file->curtext != &w->body)
1027 				continue;
1028 			winctlprint(w, b+n, 0);
1029 			n += Ctlsize;
1030 			m = min(RBUFSIZE, w->tag.file->b.nc);
1031 			bufread(&w->tag.file->b, 0, r, m);
1032 			m = n + snprint(b+n, nmax-n-1, "%.*S", m, r);
1033 			while(n<m && b[n]!='\n')
1034 				n++;
1035 			b[n++] = '\n';
1036 		}
1037 	}
1038 	qunlock(&row.lk);
1039 	off = x->fcall.offset;
1040 	cnt = x->fcall.count;
1041 	if(off > n)
1042 		off = n;
1043 	if(off+cnt > n)
1044 		cnt = n-off;
1045 	fc.count = cnt;
1046 	memmove(r, b+off, cnt);
1047 	fc.data = (char*)r;
1048 	if(!isbuf)
1049 		free(b);
1050 	respond(x, &fc, nil);
1051 	fbuffree(r);
1052 }