#include <u.h>#include <libc.h>#include <authsrv.h> int_asgetticket(int fd, Ticketreq *tr, char *tbuf, int tbuflen){	char err[ERRMAX];	int i, n, m, r; 	strcpy(err, "AS protocol botch");	errstr(err, ERRMAX); 	if(_asrequest(fd, tr) < 0)		return -1;	if(_asrdresp(fd, tbuf, 0) < 0)		return -1; 	r = 0;	for(i = 0; i<2; i++){		for(n=0; (m = convM2T(tbuf, n, nil, nil)) <= 0; n += m){			m = -m;			if(m <= n || m > tbuflen)				return -1;			m -= n;			if(readn(fd, tbuf+n, m) != m)				return -1;		}		r += n;		tbuf += n;		tbuflen -= n;	} 	errstr(err, ERRMAX); 	return r;}