#include	<u.h>#include	<libc.h>#include	<bio.h> longBread(Biobufhdr *bp, void *ap, long count){	long c;	uchar *p;	int i, n, ic; 	p = ap;	c = count;	ic = bp->icount; 	while(c > 0) {		n = -ic;		if(n > c)			n = c;		if(n == 0) {			if(bp->state != Bractive)				break;			i = read(bp->fid, bp->bbuf, bp->bsize);			if(i <= 0) {				bp->state = Bracteof;				if(i < 0)					bp->state = Binactive;				break;			}			bp->gbuf = bp->bbuf;			bp->offset += i;			if(i < bp->bsize) {				memmove(bp->ebuf-i, bp->bbuf, i);				bp->gbuf = bp->ebuf-i;			}			ic = -i;			continue;		}		memmove(p, bp->ebuf+ic, n);		c -= n;		ic += n;		p += n;	}	bp->icount = ic;	if(count == c && bp->state == Binactive)		return -1;	return count-c;}