#include	<u.h>#include	<libc.h>#include	<bio.h> longBwrite(Biobufhdr *bp, void *ap, long count){	long c;	uchar *p;	int i, n, oc;	char errbuf[ERRMAX]; 	p = ap;	c = count;	oc = bp->ocount; 	while(c > 0) {		n = -oc;		if(n > c)			n = c;		if(n == 0) {			if(bp->state != Bwactive)				return Beof;			i = write(bp->fid, bp->bbuf, bp->bsize);			if(i != bp->bsize) {				errstr(errbuf, sizeof errbuf);				if(strstr(errbuf, "interrupt") == nil)					bp->state = Binactive;				errstr(errbuf, sizeof errbuf);				return Beof;			}			bp->offset += i;			oc = -bp->bsize;			continue;		}		memmove(bp->ebuf+oc, p, n);		oc += n;		c -= n;		p += n;	}	bp->ocount = oc;	return count-c;}