17 static void do_read(int fd, int len)  in do_read()  argument
23 	if (len < 2)  in do_read()
24 		len = 2;  in do_read()
25 	else if (len > sizeof(buf))  in do_read()
26 		len = sizeof(buf);  in do_read()
29 	status = read(fd, buf, len);  in do_read()
34 	if (status != len) {  in do_read()
39 	printf("read(%2d, %2d): %02x %02x,", len, status,  in do_read()
48 static void do_msg(int fd, int len)  in do_msg()  argument
57 	if (len > sizeof buf)  in do_msg()
58 		len = sizeof buf;  in do_msg()
62 	xfer[0].len = 1;  in do_msg()
65 	xfer[1].len = len;  in do_msg()
73 	printf("response(%2d, %2d): ", len, status);  in do_msg()
74 	for (bp = buf; len; len--)  in do_msg()