#include	"lib9.h"#include	<bio.h> longBseek(Biobuf *bp, long offset, int base){	long n, d; 	switch(bp->state) {	default:		fprint(2, "Bseek: unknown state %d\n", bp->state);		return Beof; 	case Bracteof:		bp->state = Bractive;		bp->icount = 0;		bp->gbuf = bp->ebuf; 	case Bractive:		n = offset;		if(base == 1) {			n += Boffset(bp);			base = 0;		} 		/*		 * try to seek within buffer		 */		if(base == 0) {			d = n - Boffset(bp);			bp->icount += d;			if(d >= 0) {				if(bp->icount <= 0)					return n;			} else {				if(bp->ebuf - bp->gbuf >= -bp->icount)					return n;			}		} 		/*		 * reset the buffer		 */		n = seek(bp->fid, n, base);		bp->icount = 0;		bp->gbuf = bp->ebuf;		break; 	case Bwactive:		Bflush(bp);		n = seek(bp->fid, offset, base);		break;	}	bp->offset = n;	return n;}