#include <u.h>#include <libc.h>#include <authsrv.h> static char *pbmsg = "AS protocol botch"; int_asrdresp(int fd, char *buf, int len){	int n;	char error[64]; 	if(read(fd, buf, 1) != 1){		werrstr(pbmsg);		return -1;	} 	n = len;	switch(buf[0]){	case AuthOK:		if(readn(fd, buf, len) != len){			werrstr(pbmsg);			return -1;		}		break;	case AuthErr:		if(readn(fd, error, sizeof error) != sizeof error){			werrstr(pbmsg);			return -1;		}		error[sizeof error-1] = '\0';		werrstr("remote: %s", error);		return -1;	case AuthOKvar:		if(readn(fd, error, 5) != 5){			werrstr(pbmsg);			return -1;		}		error[5] = 0;		n = atoi(error);		if(n <= 0 || n > len){			werrstr(pbmsg);			return -1;		}		memset(buf, 0, len);		if(readn(fd, buf, n) != n){			werrstr(pbmsg);			return -1;		}		break;	default:		werrstr(pbmsg);		return -1;	}	return n;}